It takes 86 joules of energy to raise a box 2 meters using the pulley setup shown above. Without the pulley, the box can be raised 2 meters using only 82 joules of energy. What could explain this 4-joule difference?

You are on in line skates at the top of a small hill. Your potential energy is equal to 1,000. J. The last time you checked, your mass was 60.0kg.?

At the top of the hill, the ball has 100 J of potential energy. Explain what happens to Mechanical Energy, Kinetic Energy and Potential Energy as the ball rolls down and reaches the bottom.

The constant pressure molar heat capacity, C_{p, m}C p, m , of nitrogen gas, N_2N 2 , is 29.125/text{ J K}^{-1}/text{ mol}^{-1}29.125 J K - 1 mol - 1 at 298/text{ K}298 K.

If frequency is kept constant, how are the velocity and wavelength of a wave related?

In which situation would an object weigh the LEAST? (assume all the objects have the same mass) A) an object on Earth B) an object on the moon C) an object half-way between the Earth and moon D) an object in space closer to the moon than the Earth

What happens if a hypothesis is not supported?

a group of elements that stretch bend and conduct heat and electricity

A rectangular block has dimensions 2.9 cm x 3.5 cm x 10.0 cm. the mass of the block is 615.0 g. what is the volume and density of the block? (answer it with correct numbers of significant figures)

Which of the following are products of cellular respiration? Sunlight Oxygen ATP Water Carbon Dioxide

Do magnetic field lines ever start or end anywhere?