Answer:
false
Explanation:
"" describe about black hole ""
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Gravitational potential energy is always calculated with
kinetic energy
mechanical energy
total potential energy
mass gravity and height
Answer:
kinetic energy as it involves dispersal of energy
What the answer to the three of them ill mark brainlest
lhormmia masng ies igentetel
Explanation:
Does it take more energy to heat up water or less than
most other substances?
Answer:
Water takes more energy to heat up
True Or False? Stars glow because they produce energy by the process of nuclear fission.
Answer:
yes is the correct snswer
Explanation:
hope this help
Henry mixed salt and water together in a cup until he observed a clear solution. He measured the mass of the solution. Then he placed the cup outside for several sunny days during the summer. After a week, he observed that only solid salt remained in the cup and the mass had decreased. Henry concluded that a physical and chemical change occurred in this investigation.
Which statements correctly defend or dispute his conclusion?
He is correct. Dissolving salt in water is a physical change, but evaporating the water is a chemical change. Formation of a solid is evidence that a chemical change occurred.
He is correct. Evaporation is a physical change, but dissolving salt in water is a chemical change. The change in mass is evidence that a chemical change occurred.
He is incorrect. Dissolving salt in water and evaporation of the water are both physical changes. The reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change.
He is incorrect. Dissolving salt in water and evaporation of the water are both chemical
Answer:
He is incorrect. Dissolving salt in water and evaporation of the water are both physical changes. The reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change.
Answer:c
Explanation:
The free-body diagram of a crate is shown.
What is the net force acting on the crate?
Answer:
B
Explanation:
The top and bottom forces cancel each other. The left is more than the right so we "add" them --> -352+176=-176
-176(aka 176 to the left)
Answer:
176 to the left.
Explanation:
edge2020
For a specific volume of 0.2 m3/kg, find the quality of steam if the absolute pressure is (a) 40 kPa and (b) 630 kPa. What is the temperature of each case?
Answer:
[tex]x=0.0498[/tex]
[tex]x'=0.659[/tex]
Explanation:
Specific Volume [tex]V=0.2m_3/kg[/tex]
Absolute Pressure (a) [tex]P_a= 40kpa[/tex]
Giving
[tex]T_a=75.87[/tex]
[tex]v_f=1.265*10^{-3}m^3/kg[/tex]
[tex]v_g=3.993m^3/kg[/tex]
(b) [tex]P_a= 630kpa[/tex]
Giving
[tex]T_b=160.13C[/tex]
[tex]v_f'=1.10282*10^{-3} m^3/kg[/tex]
[tex]v_g'=0.30286 m^3/kg[/tex]
(a)
Generally the equation for quality of Steam X is mathematically given by
[tex]x=\frac{v-v_f}{v_g-v_f}[/tex]
[tex]x=\frac{0.2-1.0265*10^{-3}}{3.993-1.0265*10^{-3}}[/tex]
[tex]x=0.0498[/tex]
(b)
Generally the equation for quality of Steam X is mathematically given by
[tex]x'=\frac{v-v_f'}{v_g'-v_f'}[/tex]
[tex]x'=\frac{0.2-1.10*10^{-3}}{3.30-1.1*10^{-3}}[/tex]
[tex]x'=0.659[/tex]
Calculate the momentum of a 4,800 kg car with a velocity of 25 m/s.
Answer:
p = 120000 kg · m/s
Explanation:
p = mv
p=momentum
m=mass
v=velocity
p = (4800)(25)
p= 120000 kg · m/s
Answer:
[tex]momentum = mass \times velocity \\ = 4800 \times 25 \\ = 120000 \: kgm {s}^{ - 1} [/tex]
can anyone help me with this question
Answer:
6650km
Explanation:
Distance = (6.4 × 10³ + 250) km
= 6650 km
Suggest one material that is used to make the trampoline surface.
Explain your answer.
Answer:
Polypropylene is the safest material for trampoline mats in the trampoline market. The fibers are heavily woven to make a buoyantly webbed fabric. The fabric is then thermally interlocked to provide a smoother stabilized surface that can withstand constant flexing and stress.
The A string of a violin is a little too tightly stretched. Beats at 4.00 per second are heard when the string is sounded together with a tuning fork that is oscillating accurately at a concert A (400Hz). What is the period of the violin string oscillations
Answer:
[tex]T=2.5*10^{-3}s[/tex]
Explanation:
From the question we are told that:
Beat frequency [tex]F_b=4[/tex]
Frequency [tex]F=400Hz[/tex]
Generally the equation for Frequency of the violin is mathematically given by
[tex]f_v=F_b+F[/tex]
[tex]f_v=4+400Hz[/tex]
[tex]f_v=404Hz[/tex]
Therefore the period of the violin string oscillations is
[tex]T=\frac{1}{f_v}[/tex]
[tex]T=\frac{1}{404}[/tex]
[tex]T=2.5*10^{-3}s[/tex]
Hi whats this plss???
Answer:
a) ball K <K₀, b) the speed of the ball after the collision, c) can K> 0
d) can moves in the same direction as the ball
Explanation:
a) the kinetic energy is given by
K = ½ M v²
in this case before the collision the kinetic energy of the ball is
K₀ = ½ M v₀²
After the collision the aluminum can has a certain speed, therefore the kinetic energy of the ball must decrease, the velocity of the ball after the collision is
v <v₀
therefore the kinetic energy is
K = ½ m v²
in consecuense
K <K₀
b) an evidence of this fact is to measure the speed of the ball before the collision and the speed of the ball after the collision,
c) In the case of the aluminum can, the initial kinetic energy is ero, because it is stopped
K₀ = 0
after the collision a part of the cal momentum of the ball is transferred to the can, therefore its velocity is different from zero
K = ½ m v_can²
K> 0
d) the clearest evidence of this fact is that the can moves in the same direction as the ball
the refractive index of rock salt with respect to water is 1.17. What will be the refractive index of water with respect to rock salt
Answer:
1.17
Explanation:
Given that,
The refractive index of rock salt with respect to water is 1.17.
We need to find the refractive index of water with respect to rock salt.
We know that,
Refractive index = (speed of light in air or vaccum)/( speed of light in that medium)
Refractive index of rock salt with respect to ice = (speed of light in ice)/(speed of light in rock salt)
The speed of light in ice = c/1.31
The speed of light in rock salt = c/1.54
Required refractive index,
[tex]\mu=\dfrac{1.54}{1.31}\\\\=1.17[/tex]
So, the refractive index of water with respect to rock salt is equal to 1.17.
6. Which of the following graphs correctly demonstrates the relationship between the
electromagnetic force and distance between charges?
Answer:
But where are the graphs
Coulomb's Law describes the relationship between electromagnetic force and the distance between charges.
What is the relationship between electromagnetic force and the distance between charges?The relationship between electromagnetic force and the distance between charges is described by Coulomb's Law, which states that the force between two charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them. Mathematically, Coulomb's Law is expressed as:
F = k (q₁x q₂) / r²
where F is the electromagnetic force, q1 and q2 are the charges, r is the distance between the charges, and k is the Coulomb constant.
This means that as the distance between two charges increases, the force between them decreases, and as the distance decreases, the force increases. The relationship between force and distance is inverse square, which means that the force decreases rapidly as the distance increases.
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According to the theory of plate tectonics, the lithosphere is separated into sections that are called tectonic plates. These plates move in different directions in response to the forces in Earth’s mantle beneath them. Which of the following correctly matches the plate movement with its description?
convergent boundary; plates move away from one another causing rift valleys and the formation of new crustal material
transform boundary; plates slide past one another in opposite directions causing the formation of faults and earthquakes
divergent boundary; as the plates come together gravity pushes the edge of one plate underneath the edge of a neighboring plate
subduction zone; as the plates come together increased pressure causes the plates to fault and fracture leading to the formation of mountains
Answer:
The correct answer is - transform boundary; plates slide past one another in opposite directions causing the formation of faults and earthquakes.
Explanation:
If the continental or oceanic plates slide past one another either in the same direction or in opposition direction forms the transform fault boundary. Due to this tectonic plate formation, no new crust is formed or subducted, but earthquake activities forms.
Convergent boundaries forms by pushing the edge of one plate underneath the other while coming together whereas plates move away from one another causing rift valleys called divergent boundary.
Figure 1.18 shows an oscillating pendulum. If the time taken for the pendulum to swing from A to C to B is 3 s, what is the period of the pendulum?
Answer:
a
Explanation:
Describe the parts of the wheel and axle
Answer:
A simple machine that may be used the most often is called the wheel and axle. The wheel and axle has two basic parts: wheel and axle. It has two circular objects which includes a larger disc and a small cylinder both joined at the center.
Explanation:
Explanation:
A simple machine that may be used the most often is called the wheel and axle. The wheel and axle has two basic parts: wheel and axle. They can be found everywhere. It has two circular objects which includes a larger disc and a small cylinder both joined at the center.The large disc is the wheel, and the small cylinder or rod is the axle. There may be two wheels attached to the axle.
There are two basic ways a wheel and axle can work together to help move things.
1. The Force is applied to the Wheel
For example, a screwdriver is an example of a wheel and axle. The handle is the wheel where the force is applied. It turns or spins and increases the force of the shaft or axle, which helps turn the screw.
Another example of force being applied to the wheel is when a doorknob is turned. The wheel (doorknob) is turned and the locking mechanism connected to the shaft turns and the door can then be opened.
2. The Force is applied to the Axle
A Ferris wheel is an example of force being applied to the axle. When the axle turns it results in the giant wheel turning. The wheel is much larger than the axle and covers more distance and area. A ceiling fan works the same way.
When a car velocity is negative and its acceleration is negative, what is happening to the cars motion?
Answer:
The car is speeding up in a negative direction.
Explanation:
What is shunt resistance?
How does it help in measuring current?
Answer: A shunt is a low-ohm resistor that can be used to measure current. ... The entire current flows through the shunt and generates a voltage drop, which is then is measured. Using Ohm's law and the known resistance, this measurement can then be used to calculate the current (I = V/R).
A capacitor with a capacitance of 50µf when connected to a battery of 400 V. The charge and energy stored on it is? a. 0.05 C and 5 J b. 0.05 C and 10 J c. 0.02 C and 4 J d. 0.08 C and 12 J
Answer:
c. 0.02 C and 4 J
Explanation:
Applying,
Q = CV................ Equation 1
Where Q = Charge, C = Capacitance of the capacitor, V = Voltage.
From the question,
Given: C = 50 μF = 50×10⁻⁶ F, V = 400 V
Substitute these values into equation 1
Q = (50×10⁻⁶)(400)
Q = 0.02 C.
Also Applying
E = CV²/2............. Equation 2
Where E = Energy stored.
Therefore,
E = (50×10⁻⁶ )(400²)/2
E = 4 J
Hence the right option is c. 0.02 C and 4 J
Which of the motion variables is the same in both thex and y axis?
A) velocity
B) acceleration
C) time
D) displacement
Answer:
Acceleration (b) not sure tho
Explanation:
When conducting an experiment, researchers need to be aware of __(blank)__, or rules of conduct recognized in respect to the rightness or wrongness of certain actions on subjects.
A) IRB guidelines
B) Ethics
C) APA guidelines
When conducting an experiment, researchers need to be aware of the ethics, or rules of conduct recognized in respect to the rightness or wrongness of certain actions on subjects.
What are ethics??The moral standards that should guide how researchers do their job are known as research ethics. These values guide the creation of research laws that have been approved by organisations like university governing bodies, local communities, or governments. All researchers are expected to abide by any rules that may be relevant to their work.
A collection of rules that guide your study designs and procedures are known as ethical concerns in research. Voluntary engagement, informed permission, anonymity, secrecy, the possibility of damage, and outcomes communication are some of these principles. Therefore, option (B) is correct.
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Which of the following is an example of uniform circular motion?
A. A meteoroid falling to Earth
B. A comet orbiting the Sun in an elliptical orbit
C. A rocket traveling to the Moon
D. A satellite making a circular orbit around Earth
please help
Which of the following statements is false?
A. Weight is a vector quantity
B. Weight is measured in newtons, N
C. The weight of an object is the same on the Earth and the moon
Answer:
C
Explanation:
The weight of an object is 1/6 of the earth's weight in the moon
For example if your weight is 54 kg on earth,
Weight on moon=1/6 of 54=1/6 x 54 = 9kg
Answer:
C. The weight of an object is the same on the Earth and the moon
Explanation:
The mass of an object is ⅙ of earth's weight on moon. So, option (C) is the false statement.
que función cumple en la red las antenas o varillas en la red
Answer:
Explanation:
Para qué sirven las antenas que se colocan en la red
Las antenas de voleibol, también llamadas varillas, sirven para delimitar la zona de juego. Normalmente la red de voleibol es un poco más ancha que la zona de juego, es por ello que las varillas de voleibol se utilizan para demarcar el área de juego.
what is matter explain verifly
Answer:
Matter is a substance that has inertia and occupies physical space. According to modern physics, matter consists of various types of particles, each with mass and size.Matter can exist in several states, also called phases. The three most common states are known as solid, liquid and gas.Matter is the Stuff Around You or Atoms and compounds are all made of very small parts of matter. Those atoms go on to build the things you see and touch every day. Matter is defined as anything that has mass and takes up space (it has volume).Solid ice, water and steam are few examples of matter touched in everyday life. Subatomic particles are also considered as matter.
Answer:
Matter is everything around you. Atoms and compounds are all made of very small parts of matter. Those atoms go on to build the things you see and touch every day. Matter is defined as anything that has mass and takes up space (it has volume).
hope it helps...
A runner of mass 80 kg is moving at 8.0m/s. Calculate the kinetic energy?
Answer: 80kg = 8 (m/s) = 8m/s
Explanation:
I just solved for the function operation...
I didn't rlly get the question
A person riding a bike has a total mass of 95 kg, if the person bike system is moving at a velocity of 5 m/s, how much kinetic energy is there?
Answer:
Kinetic energy is 1187.5J
When a shopping cart rolls into a parked car on the street, It hits the car with a force of 220 newtons. The shopping cart experiences a force from the car that is how many newtons?
Answer:
220 N
Explanation:
When a shopping cart rolls into a parked car on the street, it hits the car with a force of 220 newtons.
We need to find the force the shopping cart experiences from the car.
We know that, Newton's third law of motion states that for every action there is an equal and opposite reaction.
Hence, the shopping cart experiences a force of 220 N from the car.
