Potassium atoms have one valence electron in the outer shell, 19 protons, and 19 electrons. According to the periodic chart, sodium, the alkali metal above potassium, is thought to be chemically similar to potassium.
Which of the following best describes an atom made up of 21 neutrons, 19 protons, and 19 electrons?Potassium's atomic structure. 19 protons and 21 neutrons make up the nucleus. 19 electrons surround the nucleus, with one extremely unstable electron in the outer shell (ring). The stability of an element's outer electrons governs both its chemical and physical properties.
Which element's atoms' nuclei contain 19 protons?Potassium's most prevalent isotope has a total of 20 neutrons. The stable potassium isotopes.
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A truck loaded with sand is moving down the highway in a straight path.
a. What happens to the momentum of the truck if the truck’s velocity is increasing?
b. What happens to the momentum of the truck if sand leaks at a constant rate through a hole in the truck bed while the truck maintains a constant velocity?
Momentum, the product of a particle's mass and its velocity. Momentum is a vector quantity. It has both magnitude and direction. Isaac Newton's second law of motion states that the rate of change of momentum over time is equal to the force acting on a particle.
From Newton's second law, if a particle is subject to a constant force over a period of time, the product of that force and the time interval (momentum) equals the change in momentum. Conversely, the momentum of a particle is a measure of the time it takes for a constant force to come to rest.
We know, p = mv
Where, p = momentum
m = mass of object
v = velocity of the object
Since, momentum is directly proportional to the velocity of object:
p ∝ v
This means, that momentum increases with an increase in velocity.
If the velocity is constant, then:
p ∝ m
As the truck is losing some mass due the leakage of sand at a constant rate.
So, this decrease in mass leads in a decrease of momentum.
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Students are investigating charge separation in conductors. They have two initially neutral conducting spheres and two different kinds of cloths. The students want to determine if the cloths add the same kind of charge or opposite kinds of charge when rubbed on the spheres. Which of the following procedures will provide enough information to determine whether the cloths add the same or opposite charges?a. Rub one sphere with one cloth and the other sphere with the other cloth, and touch them together. Pull them slightly apart and see if they attract or repel.b. Rub one sphere with one cloth and the other sphere with the other cloth, and bring them close together without touching. See if they attract or repel.c. Rub each sphere once with one cloth then once with the other cloth, and touch them together. Pull them slightly apart and see if they attract or repel.d. Rub each sphere once with one cloth then once with the other cloth, and bring them close together without touching. See if they attract or repel.
Answer:
rgvy
Explanation:
urfgbv
a child jumps on a trampoline. draw energy bar diagrams to show the forms of energy present in the following situations.
a. the child is at the highest point.
b. the child is at the lowest point
Answer:
a
Explanation:
an ice hockey puck is tied by a string to a stake on rough ice and slides around in a circle until it comes to a stop. what is the sign of the work done by the tension in the rope as it slides to a stop?
The rope slides to a stop with no work being done by the tension in the rope.
Which of Newton's equations of motion best describes how a hockey puck would move if there was no external force acting on it as it slid around the ice?first rule of Newton If not affected by a net external force, an item at rest or in motion maintains its state of motion at a constant speed.
A hockey puck striking is governed by what rule of motion?The First Law of Motion by Newton Ice hockey is a sport that can help us understand Newton's laws of motion. Until pushed to change its condition by a net force, an object stays at rest or moves at a constant speed (speed in a constant direction).
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Which of the following is NOT
an agent of mechanical
weathering?
a. ice
c. acid
b. wind
d. gravity
What is the magnitude b of the magnetic field at the location of the charge due to the current-carrying wire?.
Using the right hand rule, it is possible to calculate the magnetic field direction at the site of the charge caused by the current-carrying wire.
In the simplest terms possible, what is a magnetic field?The region surrounding a magnet where the effects of magnetism are perceived is known as the magnetic field. To explain how the magnetic force is dispersed in the area surrounding and inside something magnetic in nature, we utilize the magnetic field as a tool.
How does the magnetic field function?The same poles resist one another whereas opposite poles are attracted to one another. The north-seeking poles of the iron's atoms line up in the same way when you rub it against a magnet.
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a truck moves with a speed of 90 km/h for 45 mins and 120 km/h for next 20 mins find average speed
Average speed a truck moves with a speed of 90 km/h for 45 mins and 120 km/h for next 20 mins is 40.72km/h.
Average speed = Total distance / Total time
S = 73.3/ 1.8
S = 40.72km/h
Given:
90 km/h is the speed.
Time = 0.75 hours * 45 minutes
To calculate the distance travelled, substitute the following values into the distance formula:
Distance (D) is equal to the product of speed and time, hence D = 90 * 0.75 = 33.75 km.
Given:
120 km/hr speed
Time = 20 minutes = 0.3333 hours
To calculate the distance travelled, substitute the following values into the distance formula:
Consequently, the distance travelled overall is:
Distance equals speed times time, so D = 120*0.33 D = 39.6 km.
Distance is a measurement of how far apart two things or points are, either numerically or occasionally qualitatively. Distance can refer to a physical length in physics or to an estimate based on other factors in common usage.
Use the formula d = st, or distance equals speed times time, to find the distance.
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The compound dinitrogen oxide is a gas at room temperature. The two elements found in a sample of this gas
The two elements found in a sample of compound dinitrogen oxide, which is a gas at room temperature are nitrogen and oxygen.
What is dinitrogen oxide?Dinitrogen oxide or nitrous oxide is commonly known as laughing gas,
Dinitrogen oxide is a chemical compound, an oxide of nitrogen with the formula N₂O.
At room temperature, this gas is colorless, non-flammable gas, and has a slightly sweet scent.
Dinitrogen oxide or Nitrous Oxide is also called laughing gas or happy gas due to its intoxicating effects when inhaled.
From the chemical formula of Dinitrogen oxide which is written as;
N₂O = two nitrogen atoms and on1 oxygen atom
The compound of Dinitrogen oxide is made of;
2 atoms of nitrogen and 1 atom of oxygen
Thus, the compound of Dinitrogen oxide which is a gas at room temperature is made of two element. These two elements contained by the gas sample are known as nitrogen and oxygen.
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Answer:
nitrogen and oxygen.
Explanation:
the reason is cause i got it right
if a galaxy is moving away its hydrogen lines will shift toward the end of the spectrum.
When a source of light waves is moving away from the observer, the light waves appear to be dispersed. If the galaxy weren't moving, the spectral lines observed in the galaxy would be at shorter wavelengths.
Because the relationship between wave frequency and wavelength is inverse, gamma rays have incredibly short wavelengths that are barely a fraction of the size of atoms, whereas other wavelengths can go as far as the universe. Regardless of the medium they travel through, electromagnetic radiation's wavelengths are commonly represented in terms of the vacuum wavelength, even though this isn't always mentioned explicitly.
The wavelength of electromagnetic radiation affects its behavior. The speed of light is equal to wavelength times frequency. Frequency multiplied by the Planck constant equals energy. 1/wavelength is the wave number in cm. Along with the wavelengths of different parts of the electromagnetic spectrum, a rough estimation of the wavelength size is displayed..
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a stone is thrown horizontally from the top of a cliff 30m high with an itinal sped of 20, find the vertical speed of the stone as it hits the groudn
The molar mass of sulfur hexafluoride is 146 g/mol.
13. g of sulfur hexafluoride = 13 g / 146g/mol = 0.089 mol
The pressure of sulfur hexafluoride
P = nRT / V
P = 0.089 mol x 0.08206 Latm/mol/k x (10.0 + 273.15)K / 5.0 L
P = 0.41 atm.
The rate of change in position of an object in any course. Speed is measured because the ratio of distance to the time wherein the distance became included. Speed is a scalar amount because it has handiest route and no significance.
Velocity can be notion of as the rate at which an object covers distance. A quick-moving object has a high speed and covers a notably big distance in a given amount of time, whilst a sluggish-shifting item covers a relatively small amount of distance in the same amount of time.
The primary unit or the S.I. unit of velocity is m/s or ms¹.
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wo pieces of clay are moving directly toward each other. one piece having mass 300~\text{g}300 g is moving to the right at a speed of 1~\text{m/s}1 m/s. the other piece has mass 600~\text{g}600 g and is moving to the left at a speed of 0.75~\text{m/s}0.75 m/s. when they collide, they stick together and move as one piece.
The percentage of the total initial kinetic energy that is lost during the impact is 11/17J. Because two bits of clay are travelling straight toward one another at a speed.
They stick together and move as a unit when they crash into each other. A moving object or particle's kinetic energy, which depends on both mass and speed, is one of its characteristics. The type of motion can be vibration, translation, rotation around an axis, or any combination of these. Kinetic energy is a type of energy that an item or particle possesses as a result of motion.
Piece weight is 300 g.
1 m/s for each piece's speed
The other portion weighs 600 g.
0.75 m/s is the speed of the other piece.
making use of the kinetic energy formula
K.E = 1/(m1+m2)v2 K.E = 1/(300*10-3+600*10-3)*(-0.5)2\s
K.E = 0.1125J
Energy wasted equals 11/17J - 0.1125/0.31875 energy lost
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The complete question is -
Two pieces of clay are moving directly toward each other. When they collide, they stick together and move as one piece. One piece having mass 300 g is moving to the right at a speed of 1 m/s. The other piece has mass 600 g and is moving to the left at a speed of 0.75 m/s. What fraction of the total initial kinetic energy is lost during the collision?
Thermodynamics 2 QUESTION 3 A stationary gas-turbine power plant operates on a simple ideal Brayton cycle with air as the working fluid. The air enters the compressor at 95 kPa and 290 K and the turbine at 760 kPa and 1100 K. Heat is transferred to air at a rate of 35,000 kJ/s. Compare the power delivered by for the following assumptions: a. assuming constant specific heats at room temperature b. accounting for the variation of specific heats with temperature.
Assuming constant specific heats at room temperature, the power delivered by gas-turbine power plant that operates on a simple ideal Brayton cycle with air as the working fluid is 15678.25 KW
P1 = 95 KPa
T1 = 290 K
T3 = 1100 K
P2 = P3 = 760 KPa
Qin = 35000 KJ / s
At constant specific heats at room temperature,
R = 0.287 KJ / Kg K
cp = 1.005 KJ / Kg K
cv = 0.718 KJ / Kg K
K = 1.4
Pressure ratio, rp = P2 / P1
rp = 760 / 95
rp = 8
Efficiency, η = Wnet / Qin
1 - 1 / [ ( rp )^( ( k - 1 ) / k ) ] = Wnet / Qin
Wnet = 35000 * 1 - 1 / [ ( rp )^( ( 1.4 - 1 ) / 1.4 ) ]
Wnet = 35000 * 0.44795
Wnet = 15678.25 KW
Therefore, the power delivered is 15678.25 KW
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A long, horizontal wire Ab rests on the surface of a table and carries a current I. A horizontal wire CD is vertically above wire AB , and is free to slide up and down on the two vertical metal guides C and D ( as shown in Fig) .Wire CD is connected through the sliding contacts to another wire that also carries a current I , opposite in direction to the current in wire AB . The mass per unit length of the wire CD is λ. To what equilibrium height h will the wire CD rise. assuming that magnetic force on it is wholly due to current in wire AB ?
The equilibrium height to which the wire CD will rise is given by the expression h = μ₀I² / 2π λg
What is magnetic field ?A region in which the force of magnetism acts is known as the magnetic field, and it surrounds magnetic materials or a moving electric charge. Moving magnetic dipoles and electric charges produce a magnetic field, which acts as a force field on other nearby magnetic dipoles and moving charges.
Magnetic field at a distance h produced by a current carrying wire
B = μ₀I/ 2πh
Magnetic force due to the present current carrying wire can be calculated by the formula
F = B I L
And we also know that F = mg
On equating these mg = B I L
( μ₀I/ 2πh ) I = ( m/ I ) g = λg
thus we get the value of h as
h = μ₀I² / 2π λg
Thus, the equilibrium height to which the wire CD will rise is given by the expression h = μ₀I² / 2π λg .
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a block is pulled along a surface of negligible friction by a spring scale that exerts a force f on the block. the mass of the block is 4kg, and the spring scale reads 10n. which of the following free-body diagrams can be used to show the magnitude and direction of all the forces exerted on the block as it is pulled along the surface?
The correct free-body diagram is the one shown in option C
What is the correct free-body diagram?We know that the free-body diagram could be used to identify the forces that are acting on an object. We know that the normal force that acts on an object must be equal to the weight of the object and this is represented as lines of equal length on the free-body diagram.
We can now see that the correct free-body diagram is one in which the magnitude of the force weight and the normal force is the same. Now the force on the spring would be shown as the forward force.
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a circular loop of wire with a radius of 13.0 cm and oriented in the horizontal xy-plane is located in a region of uniform magnetic field. a field of 1.7 t is directed along the positive z-direction, which is upward. for related problem-solving tips and strategies, you may want to view a video tutor solution of emf and current induced in a loop.
Emf and current induced in a loop is 39.17volts
How does current flow across a wire?A wire can also be made to conduct electricity by exposing it to a magnetic field. This process of producing electricity by employing a magnet is called electromagnetic induction. It operates because when the coil "cuts through" the magnetic field line, the magnetic field around it changes.
Calculation:
Radius r = 13cm = 0.13m
Area of the circular loop can be determined using the formula for area of a circle
A = π r²
A = π × 0.13²
A = 0.0530 m²
Magnetic field B = 1.7T in positive z direction
B = 1.7•k T.
If loop is remove from the field in the time interval
∆t = 2.3ms = 2.3×10^-3s
We want to find the average EMF and it is given as
ε = —∆Φ/∆t
The final flux is zero
Φf = 0
Where magnetic flux is given as
Φi = BA Cosθ
Where θ=0 since the area and the magnetic field point in the same direction.
Φi = BA Cos0
Φi = BA
Φi = 1.7 × 0.0530
Φi = 0.0901 Vs
Then, ε = —∆Φ/∆t
ε = —(Φf — Φi) / ∆t
ε = —(0-0.0901) / (2.3×10^-3)
ε = 0.0901 / (2.3×10^-3)
ε = 39.17V
The EMF is 39.17 Volts.
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What is the magnitude b of the magnetic field at the location of the charge due to the current-carrying wire?.
The magnetic field direction at the position of the charge produced by the current-carrying wire can be determined using the right hand rule.
The magnetic field is the area surrounding a magnet where magnetism's effects are felt. We use the magnetic field as a tool to describe how the magnetic force is distributed in the vicinity and inside something magnetic in nature.
The magnetic influence on moving electric charges, electric currents, and magnetic materials is described by a magnetic field, which is a vector field. A force perpendicular to the charge's own velocity and the magnetic field acts on it when the charge is travelling through a magnetic field.
While opposed poles are drawn to one another, like poles repel one another. When you rub iron against a magnet, its atoms' north-seeking poles align in the same way.
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now consider the gaussian surface s2. with the charge still inside the cavity, what is the electric flux, in newton squared meters per coulomb, through surface s2?
Gauss's law states that the total electric flux through any closed surface is proportional to total electric charge inside the surface.
The electric flux is the measure of the electric field through a given surface. The electric field is the gradient of the potential. The density of the lines corresponds to the electric field strength, which could also be called the electric flux density. Electric flux is proportional to the total number of electric field lines going through the surface.
Electric flux has SI units of volt meters or equivalently newton meters squared per coulomb. Thus, the SI base units of electric flux are kg m3s -3*A-1.
The quantity EA1 is the electric flux through S1. We represent the electric flux through an open surface like S1. Electric flux is a scalar quantity.
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Lebron is comparing flights departing from minneapolis. Which 2 ways could lebron find the flight with the fastest average speed?.
The fastest average speed is distance divide by time.
The fastest average speed = distance / time
s = d /t
Average speed is calculated by dividing the total distance that something has traveled by the total amount of time it took it to travel that distance.
Average speed measures the average rate of speed over the extent of a trip.
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Label the spinal cord meninges and spaces. 02:00:12 Skipped Reset Zoom Subarachnoid Arachnoid mater Dura mater Subdural Pia mater space space 7
The label from superficial to deep, of meninges and their related spaces in the correct order are:
1. Dura mater
2. Subdural space
3. Arachnoid mater
4. Subarachnoid space
5. Pia mater
What is the proper sequence of the meninges, from the superficial to the deep?The brain and spinal cord are shielded by three layers of membranes called meninges. Pia mater is the thin inner layer. The arachnoid, a structure resembling a web and filled with fluid, is the middle layer and protects the brain. The durable outer layer is known as the dura mater.
The subdural space is the area that could be found between the arachnoid mater and the meningeal layer of the dura. The subdural space typically only exists in pathological conditions, similar to the epidural space.
Therefore, Between the dura mater of your spinal cord, the bones of your vertebral column, and the dura mater of your skull is a space called the epidural space.
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There has been a lot of attention given to Jupiter’s moon Europa as a possible site where life might be found. What do you think that life (if there indeed is any) might be like (be sure to consider the conditions we believe exist in the ocean under Europa’s ice crust)? What ideas might you have for how scientists could explore Europa’s ocean?
Scientists could explore Europa’s oceans by using potent technologically advanced telescopes capable of deciphering the content beneath the ice crust.
What are potent technologically advanced telescopes?The latest technologically advanced telescopes are potent optical devices that allow us to discover the presence of certain compounds not only in the atmosphere of other planets in the solar system but also the content on the surface (e.g, the water content).
These telescopes contain curved mirrors that gather and focus different spectra of light from the sky such as the Webb telescope which was launched by NASA in the final of 2021.
Therefore, with this data, we can see that technologically advanced telescopes are potent optical instruments that can be used to observe the presence of different compounds including water on the surface of a planet or its satellites such as in the case of Europe which is a satellite of Jupiter.
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In hydrogen, the transition from level 2 to level 1 has a rest wavelength of 121.6 nm.Find the speed for a star in which this line appears at wavelength 120.6 nm.Express your answer to three significant figures and include the appropriate units.
The transition from level 2 to level 1 in hydrogen has a rest wavelength of 121.6 nm. The speed of a star with this line at 120.6 nm wavelength is 2500 km/s forces.
How is an object's speed related to its velocity?Speed is the pace at which an object moves along a path in time, whereas velocity is the rate and direction of movement. In other words, velocity is a vector, whereas speed is a scalar value. People may believe that average speed and average velocity are simply different names for the same quantity, but average speed is affected by distance, whereas average velocity is affected by displacement. If an object reverses direction throughout its travel, the average speed exceeds the magnitude of the average velocity. Speed was the absolute value of velocity in one variable calculus. It is the magnitude of the velocity in vector calculus.
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Is it reasonable that a 30-kg child could run fast enough to have 100 J of kinetic energy?
(A). Yes, this is reasonable
(B). No, this is not reasonable
Answer:
A.) Yes, this is reasonable
Explanation:
The formula for kinetic energy states [tex]E_k=\frac{1}{2}mv^2[/tex]:
[tex]E_k=100J\\m=30kg[/tex]
Rewrite the formula to solve for v:
[tex]v=\sqrt(\frac{2E_k}{m})\\v=\sqrt(\frac{(2)(100J)}{30kg})\\v=\sqrt(6.67\frac{m^2}{s^2})\\v=2.58\frac{m}{s}[/tex]
[tex]2.58\frac{m}{s}[/tex] translates to approximately 5.77 mph. Which seems reasonable enough for a child.
Which process is required to allow a gravitationally-collapsing gas cloud to continue to collapse?.
Most of the cloud's thermal energy must be radiated away.
The cloud must constantly produce new dust particles. A collision with another cloud is required. Most of the cloud's thermal energy must be trapped there. Star formation depends significantly on angular momentum.
Low, dense clouds mainly serve to deflect solar energy and chill the Earth's surface. High, thin clouds mostly reflect incoming solar radiation; but, they also trap part of the infrared radiation that the Earth emits and reflect it back down, warming the Earth's surface.
The amount of emission from a cloud changes directly with its temperature in addition to being influenced by a number of other elements, including the thickness of the cloud and the composition of the cloud.
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6. suppose you apply a force of 1 n to block a and a force of 2 n to block b. does it follow that block b must have twice the acceleration of block a? justify your answer using newton's second law.
Yes, block b must have twice the acceleration of block a but Only if B has the same mass as A.
Acceleration is the rate of change of the velocity of an item with appreciation to time. Accelerations are vector portions. The orientation of an item's acceleration is given by the orientation of the net pressure appearing on that object.
Acceleration is the charge at which velocity modifications with time, in terms of each speed and route. A factor or an object moving in a straight line is accelerated if it quickens or slows down. movement on a circle is extended despite the fact that the rate is consistent because the course is continually changing.
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A man walks for 2 hours at a speed of 3m/s. How far does he travel? give your answer in kilometres.
Answer:
the answer will be 3*120*60/1000=221.6 km ok mark me brainliest pls
Based on observations, which of the following statements about stars in the Milky Way is generally true?
The older the star, the lower its abundance of heavy elements.
The less massive the star, the older it is.
The older the star, the bluer its color.
The older the star, the faster its orbital speed.
The younger the star, the higher its mass
Stars in the Milky Way, the older the star, the lower its abundance of heavy elements.
An element is a substance that can not be damaged down into a simpler layout. They may be distinguished by means of a completely unique atomic range. The elements are organized via their atomic variety in the periodic table, which highlights elements with similar residences.
Carbon is the most important detail of existence. Without this detail, existence, as we are aware of it, might not exist. As you will see, carbon is a vital element in compounds essential for lifestyles.
Kinds of elements :
1.) The elements are categorized as metallic, non-metal, and metalloid.
2.) The intense left aspect factors inside the periodic desk are metals, for example, sodium, calcium, cesium, and many others.
3) Elements such as non-metals, carbon, chlorine, oxygen, and many others.
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The vapor pressure of methanol at is. Calculate the vapor pressure in and. Round each of your answers to significant digits.
Methanol has a vapor pressure of 126 at 25 °C.
What is the definition of vapor pressure?Vapor pressure features include: It is significant to remember that when a liquid boils, the pressure of its vapor equals the atmospheric pressure. For instance, the vapor pressure of water when it boils at sea level is 1 atmosphere because the surrounding pressure is also 1 atmosphere.
How is vapor pressure measured and what does it mean?It is the force applied to the unit area of the system's wall. The boiling point method and the transpiration method are the two main experimental techniques used to assess the vapor pressure at high temperatures.
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A ball rolls horizontally off of a 120 m cliff with a velocity of 6 m/s. How far from the base of the cliff will it land?
The distance from the base of the cliff 120 m high the ball will land is 29.7 m.
What is distance?Distance is the length between two points.
To calculate the distance from the base the ball will land, we use the formula below.
Formula:
R = u√(2h/g)........... Equation 1Where:
R = Distance from the base of the cliff, where the ball landsh = Height of the cliffg = Acceleration due to gravityu = Intial velocityFrom the question,
Given:
u = 6 m/sh = 120 mg = 9.8 m/s²Substitute these values into equation 1
R = 6√(2×120/9.8)R = 6√24.49R = 6×4.95R = 29.7 mHence, the distance from the base of the cliff the ball will land is 29.7 m.
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what is mesothermal climates
Answer:
Mesothermal regions have moderate climates. They are not cold enough to sustain a layer of winter snow but are also not remain warm enough to support flowering plants (and, thus, evapotranspiration) all year.
Explanation:
Please give the brainliest.
Crane with 5 kW motor lifts the load evenly at a speed of 0.1 m/s. What is the weight of the cargo?
Answer: 0.5
Explanation:
