involves removing the top layer of earth, mining the coal, and then replacing the earth back on the surface.

Prove that the volume of a cube that moves with a velocity vin the parallel direction to one of the edges is: , being V0 the volume of the cubemeasured from a reference frame in which the cube doesn'tmove.

The organized set of rules to assign names to chemical compounds is called:

What is the difference between a horizontal line on a position graph and a horizontal line on a speed graph.

3000 J of work are done by an elevator on a man lifting him to a height of 2.5 m in 0.4 seconds ? how much energy has the man gained in being lifted?

Your roommate is working on his bicycle and has the bike upside down. He spins the 60 cm diameter wheel, and a pebble in the tread goes by 3 times every second. what is the pebbles speed and acceleration?

A refrigerator is a system. The energy input into the refrigerator system (in the form of electricity) is the same as the amount of energy output from the system. Which of the following best describes the energy output of the system?

A 1,120 kg car is travelling with a speed of 40 m/s. Find its energy.

3. Calculate the amount of current through a 45-watt light bulb that is connected to a 120-volt circuit in your home.

Are oranges called oranges because oranges are orange, or is orange called orange because oranges are orange?

An object at rest has no net force acting on it. a. True b. False