Which wheel and axle would allow a load of rocks to be dragged with less force?

Two wheel and axles

A. Wheel and axle A.

B. Wheel and axle B.

C. Both devices would require the same amount of force.

D. Not enough information

A basketball player achieves a hang time of 0.773 s in dunking the ball. What vertical height will he attain? The acceleration of gravity is 9.8 m/s^2 .

A student throws a baseball upwards at an angle of 60 degrees to the horizontal. The initial horizontal and vertical components are 12.5 m/s and 21.7 m/s, respectively.

A car travelling at 45 mi/hr (20.1 m/s) comes to rest in 4 seconds. Find the acceleration of the car in m/s2.

When the volleyball rises in the air, what does the force of gravity cause the volleyball to do

If a force of 12 N is applied to an object with a mass of 2 kg, the object will accelerate at A. 0.17 m/s2. B. 24 m/s2. C. 6 m/s2. D. 12 m/s2.

Janice has just measured the density of an object. Which value is possible? (Density: D = )

Based on how the book describes a heat pump in sec 16.3 how does a heat pump prove law of conservation of energy

When a gas in a container is squeezed to half its volume, its density?

A ballet student with her arms and a leg extended spins with an initial rotational speed of 0.90rev/s. As she draws her arms and leg in toward her body, her rotational inertia becomes 0.80 kg⋅m2 and her rotational velocity is 4.1rev/s.

The power rating of a vacuum cleaner is 0.8 kilowatts. If you use the vacuum cleaner for 2.5 hours, how much energy does it use?