The wall of a furnace conducts 1000 cal/min of heat out of the furnace and into the factory. If the wall’s thickness is reduced to half, but nothing else changes (including the inner and outer surface temperatures), the amount of heat it conducts into the factory will be

An ice cube with a small solid steel sphere frozen inside is totally immersed and floats in a glass of water filled to the brim. What happens to the level of water in the glass as a result of the ice melting at 0°C?

A plastic ball in a liquid is acted upon by its weight and by a buoyant force. The weight of the ball is 4.4 N. The buoyant force has a magnitude of 8.4 N and acts vertically upward. An external force acting on the ball maintains it in a state of rest. The external force, including direction, is closest to:

A 0.140 kg baseball is thrown with a velocity of 28.9 m/s. It is struck with an average force of 5000.0 N, which results in a velocity of 37.0 m/s in the opposite direction. How long were the bat and ball in contact?

The pressure inside a commercial airliner is maintained at 1.00 atm (105 Pa = 105 N/m2). What is the net outward force exerted on a 1.0 m × 2.0 m cabin door if the outside pressure is 0.30 atm?

A golf ball of mass 0.050 kg is at rest on the tee and has a velocity of 102 m/s immediately after being struck. If the club and ball were in contact for 0.81 ms, what is the average force exerted on the ball?

A 1000.0 kg car experiences a net force of 9500 N while decelerating from 30.0 m/s to 15.9 m/s. How far does it travel while slowing down?

You have two boxes, one containing some hot gas and the other containing some cold gas. This is all you know about these boxes. What can you validly conclude about the characteristics of the gas in the boxes?

In the absence of friction, how much work would a child do while pulling a 12 kg wagon a distance of 4.3 m with a 22 N force?

If you wanted to know how much the temperature of a particular piece of material would rise when a known amount of heat was added to it, which of the following would be most helpful to know?