Questions from College Physics

Q: In each of six electric motors, a cylindrical coil with N

In each of six electric motors, a cylindrical coil with N turns and radius r is immersed in a magnetic field of magnitude B. The current in the coil is I. Rank the motors in order of the maximum torqu...

Q: A figure skater is spinning at 10.0 rad/s

A figure skater is spinning at 10.0 rad/s with her arms extended. Her rotational inertia is 2.50 kg·m2. After pulling her arms in, her rotational inertia is 1.60 kg·m2. How much work does she do to pu...

Q: In Example 7.8, suppose instead that the fragment of

In Example 7.8, suppose instead that the fragment of mass 2M/3 has zero velocity immediately after the explosion. Where does the other fragment land?

Q: Can a body in free fall be in equilibrium? Explain.

Can a body in free fall be in equilibrium? Explain.

Q: A particle has a constant acceleration of 5.0 m/

A particle has a constant acceleration of 5.0 m/s2 to the east. At time t = 0, it is 2.0 m east of the origin and its velocity is 20 m/s north. What are the components of its position vector at t = 2....

Q: A uniform disk with a mass of 800 g and radius 17

A uniform disk with a mass of 800 g and radius 17.0 cm is rotating on frictionless bearings with an angular speed of 18.0 Hz when Jill drops a 120 g clod of clay on a point 8.00 cm from the center of...

Q: Two otherwise identical conducting spheres carry charges of +5.0

Two otherwise identical conducting spheres carry charges of +5.0 µC and −1.0 µC. They are initially a distance L apart. The distance L is much larger than the radii of the spheres. The spheres are bro...

Q: A radium nucleus (mass 226 u) at rest decays into

A radium nucleus (mass 226 u) at rest decays into a radon nucleus (symbol Rn, mass 222 u) and an alpha particle (symbol α, mass 4 u). (a) Find the ratio of the speeds vα/vRn after the decay. (b) Find...

Q: A spoked wheel with a radius of 40.0 cm and

A spoked wheel with a radius of 40.0 cm and a mass of 2.00 kg is mounted horizontally on frictionless bearings. JiaJun puts his 0.500 kg guinea pig on the outer edge of the wheel. The guinea pig begin...

Q: Gerald wants to know how fast he can throw a ball,

Gerald wants to know how fast he can throw a ball, so he hangs a 2.30 kg target on a rope from a tree. He picks up a 0.50 kg ball of putty and throws it horizontally against the target. The putty stic...