Questions from College Physics

Q: A weightless rod, 10.0 m long, supports three

A weightless rod, 10.0 m long, supports three weights as shown. Where is its center of gravity?

Q: A diver can change his rotational inertia by drawing his arms and

A diver can change his rotational inertia by drawing his arms and legs close to his body in the tuck position. After he leaves the diving board (with some unknown angular velocity), he pulls himself i...

Q: A potentiometer is a resistor with a sliding contact. It can

A potentiometer is a resistor with a sliding contact. It can be used to measure emfs accurately (Problem 131) or to supply a variable voltage to a circuit (Problem 132). In the diagram with switch S1...

Q: It is the bottom of the ninth inning at a baseball game

It is the bottom of the ninth inning at a baseball game. The score is tied and there is a runner on second base when the batter gets a hit. The 85 kg base runner rounds third base and is heading for h...

Q: The rotational inertia for a diver in a pike position is about

The rotational inertia for a diver in a pike position is about 15.5 kg·m2; it is only 8.0 kg·m2 in a tuck position. (a) If the diver gives himself an initial angular momen...

Q: Pendulum bob A has half the mass of pendulum bob B.

Pendulum bob A has half the mass of pendulum bob B. Each bob is tied to a string that is 5.1 m long. When bob A is held with its string horizontal and then released, it swings down and, once bob A's s...

Q: Consider the merry-go-round of Practice Problem 8.

Consider the merry-go-round of Practice Problem 8.1. The child is initially standing on the ground when the merry-go-round is rotating at 0.75 rev/s. The child then hops onto the merry-go-round. How f...

Q: The snow leopard (Uncia uncia) is an endangered species that

The snow leopard (Uncia uncia) is an endangered species that lives in the mountains of central Asia. It is thought to be the longest jumper in the animal kingdom. If a snow leopard jumps at 35° above...

Q: At the beginning of a scene in an action movie, the

At the beginning of a scene in an action movie, the 78.0 kg star, Indianapolis Jones, stands on a ledge 3.70 m above the ground and the 55.0 kg heroine, Georgia Smith, stands on the ground. Jones swin...

Q: A baseball batter hits a long fly ball, giving it an

A baseball batter hits a long fly ball, giving it an initial velocity 45° above the horizontal. The ball rises to a maximum height of 44 m. An outfielder on the opposing team starts running at 7.6 m/s...