exam 4 phy

The center of mass of a two partical system is at the origin. One particle is located at and has a mass of 2kg. The other particle has a mass of 3.0kg. What is the location of the 3.0kg particle

(-2.0m, 0.0m)

Convert 5 revolutions per minute to rad/s

0.52 rad/s

Twenty seconds after an electric fan is turned on, the fan rotates at 300 rev/min. Its average angular acceleration is:

1.57 rad/s^2

A wheel with a moment of inertia of 2.00 kg-m^2 accelerates with an angular acceleration of 5.0 rad/s^2. What is the net torque on the wheel?

10 N*m

Two points, A and B, are on a disk that rotates about an axis. Point A is three times as far from the axis as point B. If the speed of point B is v, then what is the speed of point A?

3v

A figure skater spins with her arms extended. When she pulls in her arms

Both a & c are true

Two boxes, one heavier than the other, are initially at rest on a horizontal frictionless surface. The same constant force F acts on each one for exactly 1 second. Which box has more momentum after the force acts?

Both the same

Two spheres have the same radius and equal masses. One is made of solid aluminum, and the other from a hollow shell of gold. Which one has a greater moment of inertia about an axis through its center.

They both have the same moment of intertia

You and your friends are on a carousel ride rotating at a constant angular speed. You walk to a horse at the outside of the carousel. As you walk

Your tangential speed increases

A railroad car collides with and sticks to an identical railroad car that is initially at rest. After the collision, the kinetic energy of the system.

half as much as before

An open cart rolls along a frictionless track while it is raining. As it rolls, what happens to the speed of the cart as the rain collects in it? (assume that the rain falls vertically into the box)

it slows down

When a wheel rolls without slipping,

its motion is a combination of rotational and translational motion

which one of the following quantities is conserved during an elastic collision, but not conserved during an inelastic collision

kinetic energy

When a woman on a frictionless rotating turntable extends her arms out horizontally, her angular momentum:

must remain the same

the momentum of an object at a given instant is the same direction as its

velocity