Physics, 10.11.2019 00:31 jessnolonger

Before colliding, the momentum of block a is -100 kgm/, and block b is -150 kgm/s. after, block a has a momentum -200 kg*m/s. what is the momentum of block b afterward?

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Answer from: ShianHagen5

The momentum of block B = -50 Kg m/s

Explanation:

Given,

The initial momentum of block A, MU = -100 Kg m/s

The final momentum of block A, MV = -200 Kg m/s

Consider the block B is initially at rest.

Therefore, the initial momentum of block B, mu = -150 Kg m/s

According to the laws of conservation of linear momentum, the momentum of the body before impact is equal to the momentum of the body after impact.

MU + mu = MV + mv

-100 + (-150) = (-200) + mv

mv = -250 - 200

= -50 Kg m/s

Hence, the momentum of the block B after impact is, mv = -50 Kg m/s

Answer from: Quest

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

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Before colliding, the momentum of block a is -100 kg*m/, and block b is -150 kg*m/s. after, block a...

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