Physics, 08.04.2020 00:18 jakeisadog698

4. Monica stands at the edge of a circular platform that is slowly rotating on a frictionless axle. She then walks toward the opposite edge, passing through the platform’s center. Describe the motion of the platform as Monica makes her trip.

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Answer from: klongstreet1731

Explanation:

Since it is a circular platform, then Monica will move with an angular velocity from one edge of the platform to another while covering a specific radius.

Let's analyse her movement:

When Monica was initially at the edge of the platform, her angular velocity is at the lowest. Once she starts moving towards the centre of the circular platform, her angular velocity increases until she reaches the centre of the platform where the angular velocity will be at the maximum. The angular velocity is always at maximum when the radius is zero. At the centre of the platform the radius is zero making her angular velocity to be at maximum. As she moves toward the other end of the path from the center, her radius will increase and this increase in the radius will cause a decrease in her angular velocity.

This statement true according to the relationship between the angular velocity and the radius

w = v/r where

w is the angular velocity

r is the radius

It can be seen that the angular velocity is inversely proportional to the radius which means as the radius increases the angular velocity of Monica decreases and vice versa.

Answer from: Quest

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas

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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4. Monica stands at the edge of a circular platform that is slowly rotating on a frictionless axle....

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