The pressure exerted on the floor by each leg is calculated to be 777,982.5 Pa
As the formula for force is F = mg, therefore;
F = (mass of person + mass of stool) × g
F = (4.5 + 86) × 9.8
F = 886.9 N
This force of 886.9 N is evenly distributed on the three legs
radius, r = d/2
= 2.2 / 2
= 1.1 cm = 0.011 m
The total cross-sectional area of the three legs, A = 3 × pi × r^2
A = 3 × π × 0.011²
A = 0.001140 m²
Pressure due to weight,
P = 886.9 N / 0.001140
P = 777,982.5 Pa
Hence 777,982.5 Pa is the pressure exerted on the floor by each leg
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TRUE/FALSE. initial discovery of radioactivity and how it was thought to be the same as another type of light energy emission
Initial discovery of radioactivity and how it was thought to be the same as another type of light energy emission is true statement.
Henri Becquerel made the initial discovery of radioactivity. She investigated the characteristics of x-rays, which Wilhelm Roentgen had discovered in 1895, using naturally fluorescent minerals. In the belief that the uranium would absorb the sun's energy and then release it as x-rays, he placed potassium uranyl sulphate on photographic plates covered in black paper and exposed them to the sun.A study released earlier this month by the Global Carbon Project (GCP), a team of scientists who monitor emissions, predicts that CO2 emissions will increase by 4 point 9 percent in 2021 compared to the previous year.
Due to the COVID-19 pandemic and related lockdowns, emissions decreased by 5 point 4 percent in 2020.
With a 40% share and increasing, the energy sector remains the main source of greenhouse gas emissions.
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Gas a and gas b (both unreactive) are allowed to mix. The total pressure is found to be 3. 50 atm. If gas b was measured initially at 1. 25 atm, what is the partial pressure of gas a?.
If the entire quantity of the beginning material alone were to be occupied at the same temperature, the partial pressure inside a gas mixture would be the hypothetical pressure of that constituent gas. Gas an is under 2.25 atm of partial pressure.
By pressure, what do you mean?The perpendicular force per unit area, also known as the stress at a point within a confined fluid, is referred to as pressure in the physical sciences.
The purpose of pressure measurementThe manufacturing process in many different sectors depends heavily on gauging a substance's pressure. To assess the product's consistency and quality, it's critical to collect precise data that has meaning. These factors make having precise sensors essential for gathering this data.
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PRELAB: A MODEL FOR CIRCUITS III: CAPACITORS AND RC CIRCUITS
1. Predict the change in capacitance of a parallel plate capacitor as the area of the plates is increased.
2. Predict the change in capacitance of a parallel plate capacitor as the separation between the plates is increased.
3. Briefly describe the observations you will make in Activity 1-2 of the lab to test one of these two predictions.
4. If you have two identical capacitors, what do you predict will be the capacitance of the two connected in parallel?
5. Briefly describe the observations you will make in Activity 2-1 of the lab to test this prediction.
6. What devices will you use to measure the decay of voltage in an RC circuit?
A parallel plate capacitor has a capacitance of C=fracepsilon_0 Ad, where A is the area of the plates and d is the distance between them. 1) If the area of the plates A_1 grows, then A_1>A C_1=fracepsilon_0 A_1d>fracepsilon_0 Ad C_1>C, which means that the capacitance also grows.
2) If the distance between the plates is increased by d_1, the capacitance decreases because d_1>d C_1=fracepsilon_0 Ad_1 fracepsilon_0 Ad C_1C.
3) Since capacitance is directly proportional to plate area, capacitance also increases with plate area.
Because capacitance is inversely proportional to plate separation, capacitance decreases as plate separation increases.
4) When two identical capacitors are connected in parallel, their equivalent capacitance is C_1 C_1=C+C=2C. 6) The Voltmeter is the device used to measure the voltage decay in an RC circuit.
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(c) complete the table to represent the relationship between volume and surface area of a spherical structure surrounded by a membrane.
The table represents the relationship between the volume and surface area of a spherical structure surrounded by a membrane just remember that the ratio is 1:3 and 1:1.
The surface area to volume ratio of an object is the ratio of the two measurements. The ratio of surface area to volume. Shows a comparison of the outer size and inner volume of an object. A small, thin object has a large surface area compared to its volume.
Increasing the surface area of a cell increases the amount of material that diffuses into the cell. As volume and surface area increase, volume increases more rapidly, so for every doubling of cell volume, the surface area available for uptake is halved. The amount of surface area per unit volume of an object or collection of objects.
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1. If the area of the circle you draw around the vesicle is 24 pixels what would the value of the radius be in pixels? Show your work. 2. Given your answer to Question 1, and the fact that 1um = 5.179 pixels, convert your radius from pixels to m. Show your work
3. To calculate the effective viscosity, you need to know the efficiency of the vesicle motion Supposing myosin motor proteins are moving the vesicles, what is the decimal value for the efficiency, e? (Hint:It is reported as a percent in the lab manual.)
According to the Hardy-Weinburg principle, if there are no forces driving evolution, then phenotype frequencies of such a particular population should remain stable.
How does vesicle movement work?Vesicle movement observations demonstrate that vesicles travel in a specific direction and that they copurify with kinesin motor activity.
According to the available data, kinesin and retrograde motors attach to the correct vesicle to drive vesicle movements in vivo.
Where do vesicles go?Cargo-filled vesicles are transported along the cytoskeleton by means of special motor proteins that attach to them.Different motor proteins are designed to move certain types of cargo in one direction or another along the cytoskeleton. .
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the normal component of the magnetic flux density remains continuous across the boundary between two magnetic media
Across the border, the normal component of the flux density is constant. The strength of the tangential field is the second boundary condition, which is B1n = B2n.
Magnetic flux is it constant?Conclusion. In a continuous loop perpendicular to the motion of the electric dipoles in the magnetic material, the magnetic flux is constant and happens. Due to the conductor's constant area and varying magnetic field, the magnetic flux may change.
What is the boundary condition for E across the media interface?There could be a surface charge density at the boundary between two materials. The normal components of the electric field are discontinuous and equal to the surface charge density at the boundary between any two dielectrics, while the tangential components are continuous.
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For a galvanic cell, the cathode has a sign and is the site of negative; oxidation negative; reduction positive, oxidation positive, reduction
The cathode has a positive sign and is the site of reduction.
What exactly is a cathode?The term cathode refers to a polarized electrical device that regulates electric current. The cathode needs electrons to provide current, it progressively accumulates mass from the cations it draws.
How does the cathode perform?The positive ions go towards the cathode and the negative ions flow towards the anode when an electric current is passed through a cell containing an electrolyte. The circuit will not be complete if the cathode is removed from the solution, which will cause the ions to travel aimlessly since they lack direction. Due to the reversal of the electron flow in a power-generating device, the cathode is the positive terminal. When the battery's energy is being used in devices like galvanic cells, they become non-rechargeable.
Hence, the cathode undergoes reduction with a positive sign.
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The voltage across a 10 ohm resistor carrying 5 Amps of current is a. 10 Volts b. 5 Volts c. 1 Volt d. 50 Volts
The voltage of the resistor of resistance 10 ohms is 50 V. The correct option is d. 50 Volts.
What is voltage?Voltage describes the “pressure” that pushes electricity.
To calculate the voltage of the resistor, we use the formula below.
Formula:
V = IR............... Equation 1Where:
V = VoltageI = CurrentR = ResistanceFrom the question,
Given:
I = 5 AR = 10 ohmSubstitute these values into equation 1
V = 5×10V = 50 VHence, the voltage of the resistor is 50 V. Correct option d. 50 volts.
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how is einstein's famous equation, e = mc2, important in understanding the sun?
The correct answer is option D) the Sun generates energy to shine by losing 4 million tonnes of mass each second.
What is sun ?
The Sun, a 4.5 billion year old yellow dwarf star and the centre of our solar system, is a hot, glowing ball of hydrogen and helium. It's about 93 million miles (150 million kilometers) from Earth and it's our solar system's only star. The sun is not a solid mass. It does not have easily identifiable boundaries like rocky planets like Earth. Instead, the sun is composed of layers made up almost entirely of hydrogen and helium.
It explains the fact that the Sun generates energy to shine by losing some 4 million tonnes of mass each second. The "lost" 4 million tonnes is turned to an amount of energy equal to this mass times the speed of light squared.In order to produce the energy we see it produce, the Sun needs to fuse 4 × 1038 protons into helium-4 per second. The upshot of that fusion is that 596 million tonnes of helium-4 are formed with each second that passes, while 4 million tonnes of mass are turned into pure energy via E = mc2.
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specific features are created using scrum methodology according to four distinct phases. which of the following places these phases in the correct order?
Analysis, Design, Build, Test is the correct order specific features are created using scrum methodology according to four distinct phases
Explain the distinct phase of force.A force that is applied to an object by a person or another object is referred to as an applied force. When someone pushes a desk across the room, there is an applied force acting on the object. The applied force is the force that the person exerts on the desk. The force of gravity is the attraction that the earth, moon, or other enormously large object has on another object. The normal force is the force exerted by one object in contact with another stable object. The friction force is the force exerted by a surface when an object moves or attempts to move across it.
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name five (5) keys to a successful strategic partnership (note: there are more than 5, but you only need to identify any 5) (note: you don't have to describe them, only name them)
The (5) keys to a successful strategic partnership are:
-Creating trust
- Have shared vision and objectives
-There should be personal relationships
-Mutual benefits and needs
-Total commitment and top management support
What are the The (5) keys to a successful strategic partnership about?Strategic Partnership is Important for attaining competitive performance that benefits both the buyer and the supplier, as well as a strategic position as opposed to a tactical one
Successful strategic partnerships need both sides to commit over an extended period of time to working together for their mutual advantage, exchanging pertinent information and the risks and rewards of the connection.
Therefore, Partners are more ready to cooperate, find compromise solutions to issues, work toward obtaining long-term advantages for both parties, and go above and above when there is trust between them. It is essential for both spouses to have a common vision and mutually accepted goals.
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Label the photomicrograph of thick skin. Stratum corneum Stratum basale Stratum granulosum Stratum lucidum Epidermis Dermis Stratum spinosum
The Label of the photomicrograph of thick skin is given in the image attached.
What factors affect skin thickness?A significantly thicker epidermis, the skin's top layer, is what gives thick skin its thickness. The stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum—the four top layers of the epidermis—are particularly responsible for the bulk of thick skin.
Therefore, note that Thick skin lacks hairs, sebaceous glands, and apocrine sweat glands and has a thinner dermis than thin skin. Fingertips, palms, and the soles of your feet are examples of places with thick skin because they are frequently subjected to abrasion.
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when a movie on a film is projected
A specific number of frames per minute are processed by the projector when a motion picture on film is shown.
What is motion and example?Motion is indeed the open borders of a body in relation to time. For instance, the fan, the carpet's dust blowing off of it, the water running from the taps, a ball rolling about, a moving car, etc. Even for the universe is always changing.
Why do you mean by motion?Movement, the act of process of changing or shifting locations or positions. ability to move with the force of a physical human. gait is the term for the way a person walks. a gesture; a movement or shift in posture.
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a. What are the defects of simple cell?
a block is released from rest at point p and slides along the frictionless track shown. at point q, its speed is:
Without any friction (= the force that makes it difficult for an object to slide across or move through something):
Is an air track frictionless?Regardless of any internal changes that may occur, including energy dissipating in one form and reappearing in another, the total energy of an isolated system remains constant.A friction drive belt, as implied by its name, is a track that is tensioned to smooth rubber wheels much like a conveyor belt. The tractive force generated for propulsion is the friction between the drive wheels and the roller path of the track.happening very easily without anything to make it slower or more difficult: We need completely frictionless trade, without tariffs or border checks. The application offers frictionless downloading and sharing.An air track is a scientific device used to study motion in a low friction environment. Its name comes from its structure: air is pumped through a hollow track with fine holes all along the track that allows specially fitted air track cars to glide relatively friction-free.Block is released from point p
Track is frictionless
height travels from p to q
(h1-h2 )
(optional energy ) p =Q ( kinetic energy)
mg( h1 - h2) = 1/2mv^2
2g(h1-h2) = v^2
###
(√2g ( h1-h2 ) = v )
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which of the following lists two ways that transcranial magnetic stimulation is similar to electroconvulsive therapy?
Transcranial magnetic stimulation is similar to ECT in that "both are effective in alleviating depression and no one knows why".
Transcranial magnetic stimulation (rTMS) refers to a drug that treats a type of brain stimulation treatment used to treat sadness and nervousness. It has been being used since 1985. The treatment includes utilizing a magnet to target and fortify certain regions of the brain.
Doctors recommend taking no less than one round of medicine(drug) antidepressants before investigating the likelihood of rTMS. Antidepressants and psychotherapy might be utilized in mix with rTMS.
Therefore, they are similar to each other as these drugs are usually give a suggestion that brain stimulation is effective when treating severe forms of depression. These methods are usually used after other methods have been tried and failed. They involve the stimulation of the brain.
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the unique challenge for (fill the blank) markets is that they must develop flexible, customized solutions that meet the specific needs of, for example, different sized churches or school districts.
The unique challenge for Institutional markets is that they must develop flexible, customized solutions that meet the specific needs of, for example, different-sized churches or school districts.
What are institutional markets?Institutional markets can be defined as markets located inside government institution facilities such as buildings or universities, which are aimed at providing products and services to people who work and or study in these locations.
Therefore, with this data, we can see that institutional markets are located inside government facilities and gives services or products to workers and or students who make their activities.
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the pulsar in the center of the crab nebula (shown in the figure) is the remnant of a supernova that occurred in a.d. 1054. the current power output of this pulsar is pcrab
The approximate factor by which the power output of this supernova has declined since its explosion is 2 * 10⁻¹⁰
Rate of power output's decline = Current power output / Initial power output
Current power output = 10²⁸ W
Initial power output = 5 * 10³⁷ W
Rate = 10²⁸ / 5 * 10³⁷
Rate = 2 * 10⁻¹⁰
To convert this rate into a percentage value, multiply this value by 100.
Rate = 2 * 10⁻¹⁰ * 100%
Rate = 2 * 10⁻⁸ %
Therefore, the rate of decline is 2 * 10⁻¹⁰
The given question is incomplete. The complete question is:
The pulsar in the center of the crab nebula (shown in the figure) is the remnant of a supernova that occurred in AD 1054. the current power output of this pulsar is 10²⁸ W and initially the supernova has a power output of 5 * 10³⁷. Calculate the approximate factor by which the power output of this astronomical object has declined since its explosion.
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a student is riding a ferris wheel that moves at a constant tangential speed around a vertical circular path of radius r, as shown in figure 1. the student is sitting on a scale. at the instant the moving student is located at point p, the scale exerts a force of magnitude fscale on the student and earth exerts a force of magnitude fgravity on the student, as shown in the free-body diagram in figure 2. which of the following statements provides reasoning that supports and correctly identifies the magnitude of the force that the student exerts on the scale when the student is at point p ?
Answer:B
Explanation:According to newtons 3rd law, the forces must be equivalent
you have three light bulbs; bulb a has a resistance of 240 q, bulb b has a resistance of 192 q, and bulb c has a resistance of 144 q. each of these bulbs is used for the same amount of time in a setup like that in the drawing. in each case the speed of the rod and the magnetic field strength are the same. rank the setups in descending order, according to how much work the hand in the drawing must do (largest amount of work first).
The correct sequence will be: A, B, C
Given,
Resistance A = 240 Ω
Resistance B = 192 Ω
Resistance C = 144 Ω
We know that the resistance has relations with Current (I) and Voltage (v)
But to find the work done by the hand,
We will apply the formula of the work,
W = VIt
Replacing V with R/I
Work = (R/I)*I*t
Work= R*t
The time given is same.
So here,
Work = Resistance,
By this derivation, the highest resistance will do the highest amount of work.
Therefore, the work done by Resistance A will be the most and then the work by resistance B and then the work by resistance C.
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what does a frequency of recombination of 50 indicate
A frequency of recombination of 50% indicates that the genes are independently assorting.
Describe the gene?A gene is known as the basic physical and functional unit of heredity. Genes are made up of DNA. Some genes act as instructions to make molecules called proteins. However, many genes do not code for proteins. In humans, it is known that genes vary in size from a few hundred DNA bases to more than 2 million bases.
A frequency of recombination of 50% indicates that the genes are independently assorting which means that the inheritance of alleles at the two loci are independent. If the recombination frequency is less than 50% we say the two loci are linked.
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Problem 12.41 9 of 9 Review A 50 g mass rotates in a vertical plane--call it the xy-plane with the y-axis pointing up--at the end of a 75-cm-long, massless, rigid rod. The other end of the rod is attached to a frictionless pivot at the origin. Part A What is the gravitational torque about the pivot when the mass is 60° above the +x-axis? Give your answer using unit vectors. Express your answer in newton-meters. Enter components of torque, separated by comma. IVO AE ? Tx, Ty,Tz = N·m Submit Request Answer
The value of gravitational torque after solving the expression will be equal to -0.18375 N.mz.
What is Torque?The rotating equivalent of a force in physics or mechanics is called torque. Depending on the topic matter, it may also be referred to as the moment, point in time of force, rotating force, or turning effect. It symbolizes a force's capacity to cause a change inside the bodies natural rotational motion.
As per the given information in the question,
Mass, m = 50 g
Length, l = 75 cm
Gravitational force, [tex]\vec F[/tex] = -mgy
Then, the position vector of the particle will be,
[tex]\vec \tau[/tex] = l(cos 60° x + sin 60° y) × (-mgz)
= -0.18375 N.mz
Therefore,
[tex]\tau_x, \tau_y,\tau_z=0, 0, -0.18375[/tex]
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a student in an electronics lab is studying the electrical properties of pieces of graphite
A cylindrical bit of graphite with a radius of 0.7 mm is subjected to a potential differential of 24 V along its length by the student.
What use does graphite serve?Pencils, lubricants, crucibles, casting facings, polishes, arc lights, batteries, electric motor brushes, and nuclear reactor cores all include graphite. China, India, Brazil, N.korea, and Canada all mine large amounts of it. Graphite was inadvertently created for the first time by Edward G.
What is distinctive about graphite?It is special in that it possesses traits common to both metals and non-metals, including flexibility without being elastic, high thermal and electrical conductivity, high refractoriness, and chemical inertness. Due to its low X-ray and neutron absorption, graphite is a particularly useful material.
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saturation occurs when
Saturation occurs when air contains the maximum amount of water vapor possible for its given temperature.
What is saturation?Saturation in meteorology is a state of the atmosphere when it is saturated with water vapour i.e. 100% humidity.
Also, in chemistry, saturation is a characteristics of a solution containing all the solute that can normally be dissolved at a given temperature.
Condensation and evaporation occur simultaneously , but at some point, the air becomes saturated, meaning the rate of evaporation is the same as the rate of condensation.
In other words, the air cannot hold any more water vapor at that temperature and pressure, so if any liquid water molecules become water vapor, the same amount of water vapor must condense and return to a liquid.
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How does the force that causes the water to leave the rocket compare to the force that causes the rocket to launch?.
The force that causes the water to exit the rocket is equivalent but opposite in direction to the force that causes the rocket to launch.
What is the significance of force?Force can cause a still body to move. It has the ability to either stop or slow a moving body. It has the ability to increase the speed of a moving body. It can also affect the shape and size of a moving body as well as its direction. A force exerted on an object causes it to change shape or size, begin or stop moving, accelerate or decelerate. When two things contact, they exert a force on one other; these exerted forces are equal in size but opposite in direction. The strong force is thought to be nature's most powerful force. The electromagnetic, weak, and gravitational forces follow in declining sequence.
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Consider an electron near the Earth's equator. In which direction does it tend to deflect if its velocity is directed in each of the following directions? (A) Downward(B) Northward(C) Westward(D) Southeastward
it tend to deflect if its velocity is in Westward direction.
What does an electrical deflection mean?An electric field that is supplied transverse to the route of the particles can be used to change the trajectory of a stream of charged particles, a process known as electrostatic deflection.
In physics, what does deflection mean?Deflection in physics is the modification of a moving object's velocity and, consequently, trajectory due to contact (collision) with a surface or the action of a non-contact force field.
What's an illustration of deflection?When someone switches the subject in the middle of a discussion, that is one of the most prevalent instances of deflection. In particular, the deflector will refocus the discourse to center on something the other person did incorrectly if their behavior is questioned.
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After taking a hot shower, James steps out of the shower onto the tile floor. The tile felt cold to his feet. Which explanation below best describes James' experience?A.Heat from his feet is transferred to the tile floorB.Heat from the tile floor is transferred to his feetC.Cold from the tile floor is transferred to his feetD.Cold from his feet is transferred to the tile floor
The tile felt by James through his feet is due to the phenomenon on conduction. A) The heat from his feet gets transferred to the cooler tile.
When two objects are touching, and the objects each have a different temperature, then there is a transfer of energy from the hotter to the cooler one. You experience conduction throughout your day. For example, conduction explains why a tile floor feels cold on your feet (the energy from your warm foot is being transferred to the cooler tile floor) or an item taken from a freezer feels cold in your hands (the energy from your warm hand is flowing toward the item you took from the freezer).
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Two lasers are shining on a double slit, with slit separation d. Laser 1 has a wavelength of d/20, whereas laser 2 has a wavelength of d/15. The lasers produce separate interference patterns on a screen a distance 5.10 m away from the slits.
Which laser has its first maximum closer to the central maximum?
Ans: laser 1
What is the distance Image for Two lasers are shining on a double slit, with slit separation d. Laser 1 has a wavelength of d/20, whereas las between the first maxima (on the same side of the central maximum) of the two patterns?
The difference between two slits is 0.09m
It can be seen that the separation between two consecutive interference maxima is constant and independent of the order observed.
Considering that the small angle approximation is valid then we have to
y1 = (1* 5.10m* d/20) / d
y1 = 0.25
y2 = (1*5.10m*d/15) / d
y2 = 0.34
Therefore, the first order maximum produced by laser 1 is closer to the central maximum than that the 1st order maximum produced by laser 2.
Using a previous result y2 - y1
0.34 - 0.25 = 0.09m
In the young's experiment the angular position of intensity maxima and minima of interference is determined by the separation between the slits, an integer number known as order of interference, and the wavelength of the light used.
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three balls are in water. ball 1 floats, with half of it exposed above the water level. ball 2, with a density less than the density of water is held below the surface by a cord anchored to the bottom of the container, so that it is fully submerged. ball 3, of same radius as ball 2, but of greater mass, is suspended from a rope so that it is fully submerged.
The correct statement about the ball 1 is the magnitude of buoyancy force is equal to that of ball's weight.
The upward force exerted on an object that is wholly or partially immersed in a fluid is called upthrust.
Ball 1 is floating on water.
Weight of the ball 1 is Fg = m₁g is acting vertically downward.
Force of buoyancy Fb = ρvg is acting vertically upwards
Net force acting on the ball is zero, Fg = Fb
As the ball 1 floats without sinking, it is in equilibrium.
This means that the net downward force is balanced by the net upward force.
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the solid dot shown in the figure below is a pivot point. the board can rotate about the pivot.
The torque due to perpendicular force will be greatest.
Torque is the measure of the force that can cause an object to rotate about an axis. Force is what causes an object to accelerate in linear kinematics.The unit of torque is Newton–meter (N-m) A simple way to calculate the magnitude of the torque is to first determine the lever arm and then multiply it times the applied force.It is a vector product hence torque also must be a vector. Using vector product notations we can find the direction of torque.We know that Torque = mass * velocity * sinα
where α = angle between mass and velocity.
For maximum torque, sinα = 1 ; i.e. α = 90°.
So the torque due to perpendicular force will be greatest.
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