Which of the following is the most vital way in which humans depend on plant energy?

Which of the following can supply the energy for modern home heating systems? electricity biomass solar geothermal

A small rubber ball and a bowling ball are about to be dropped from the same height. Which has more gravitational potential energy?

What stores energy for a quick release in a cell?

What activates a convection current starting the flow of liquid

Which of the following statements is/are true? Check all that apply. A nonconservative force permits a two-way conversion between kinetic and potential energies.

A star has a mass of 1.36 x 1030 kg and is moving in a circular orbit about the center of its galaxy. the radius of the orbit is 2.1 x 104 light-years (1 light-year = 9.5 x 1015 m), and the angular speed of the star is 1.1 x 10-15 rad/s.

Floating in deep space, you find yourself at rest next to a small asteroid. You reach out and tap the asteroid with a hammer. What happens to you in this process?

You walk forward at 1.5 m/s for 8s. Your friend decides to walk faster and starts out at 2.0 m/s for the first 4 s. Then she slows down and walks forward at 1.0 m/s for the next 4s. Make a distance-time graph of your motion and your friend's motion.

If the coolant in a refrigerator was not compressed back into a liquid after it flowed through the refrigerator what would happen

A electric model train travels at 0.339 m/s around a circular track of radius 1.75 m. How many revolutions does it perform per second, i. e, what is the motion's frequency?