PHYSICS HIGH SCHOOL

Which of the following are pure substances?a. solutions
b. compounds
c. homogeneous mixtures
d. colloids

Answers

Answer 1
Answer: The pure substances are c. homogenous mixtures
Answer 2
Answer: I think it's C hope this help

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Car A has a mass of 1,200 kg and is traveling at a rate of 22 km/hr. It collides with car B. Car B has a mass of 1,900 kg and is traveling in the same direction at 25 km/hr. Which of the following statements is true?A) The momentum before the collision is equal to the momentum after the collision.

B) The momentum before the collision is greater than the momentum after the collision.

C) The momentum before the collision is less than the momentum after the collision.

Answers

The car A has a mass of 1200 kg.

The car B has the mass of 1900 kg.

It is given that velocity of car  A is given as 22 Km/hr

The car B has the velocity of 25 Km/hr.

Let the mass of two bodies are denoted as  m_(1) \ and\ m_(2)

Let the velocity of cars A and B are denoted as v_(1) \ and\ v_(2)

The momentum before collision is-

                                                  p_(i) =m_(1) v_(1) +m_(2) v_(2)

[Here p stand for momentum.]

We are asked to calculate the final momentum of the system after collision.

The answer of the question is based law of conservation of  linear momentum.

As per law of conservation of linear momentum the sum total linear momentum for an isolated system is always constant.Hence irrespective of the type of collision[elastic and inelastic],the momentum of the system is always constant which is a universal truth.

Let after the collision the velocity of A and B are v'_(1) \ and\ v'_(2)

Hence the final momentum of the system is-

                                                        p_(f) = m_(1) v'_(1) +m_(2) v'_(2)

As per the law of conservation of linear momentum, the initial and final momentum must be equal i.e      

                              p_(i) =p_(f)

                               m_(1) v_(1) +m_(2)v_(2) =m_(1) v'_(1) +m_(2) v'_(2)

Hence the option A  is right.
A
This principle is known as the law of conservation of momentum.

A force is applied to a block, causing it to accelerate along a horizontal, frictionless surface. The kinetic energy gained by the block is equal to which of the following​

Answers

Answer:

The work done to the block

See

Workdone is Force×Displacement .

Also work done is total mechanical energy of body

  • As potential energy is 0

Mechanical energy=Kinetic energy

So option C is correct

when the u-235 nucleus absorbs a thermal neutron, ba-141 and kr-92 nuclei are produced along with some neutrons. how many neutrons are emitted?

Answers

A neutron is absorbed by the original uranium-235 nucleus before it splits into two new nuclei, krypton-92 and barium-141, which also releases three additional neutrons. These three neutrons can then split three more uranium-235 nuclei, releasing more neutrons with each fission, and so on.

When does a thermal neutron enter the U-235 nucleus?

A U-235 nucleus splits into two pieces when it takes in an extra neutron. Fission is the name of this process. Two to three neutrons are released each time a U-235 nucleus splits. Consequently, starting a chain reaction is a possibility.

U-235 atoms take in free neutrons during fission. Due to this, U-235 becomes unstable and fragments into two light atoms known as fission products.

To know more about neutrons visit:

brainly.com/question/29771588

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The ________________ theory of matter states that all particles of matter are in constant motion.

Answers

The kineticmolecular theory of matter states that all particles of matter are in constantbattering motion. It is mostly applied to gaseous particles. This is becausethey have room for movement in that their distance between each particle isgreat. That is why gases has greater volume compared to liquids and solids. Anexample of this is 1 kg of liquid water. It is placed inside the balloon. When heated,you observed that the balloon expands. This is because the particles of liquidwater do not want to be so close with each other. That is why it expands.
The kinetic molecular theory of matter states that all particles of matter are in constant motion. Kinetic energy is energy in motion, while potential energy is energy at rest. 

The apparent change of frequency of a source of sound due to it me relative motion between the sound and a listener is called the

Answers

That's the "Doppler effect". It's also the operating principle
behind police speed radar.

Stable system where forces cancel eachother out

Answers

Equilibrium - stable system where forces cancel each other out
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