Force exerted by a person or object

reddit One company sells a defibrillator for home use that uses a 9-volt DC battery. The battery is rated at 4.2 A•hr (amp•hour). Roughly how much charge can the battery deliver?

How is a record of magnetic reversals recorded in molten rock at mid-ocean ridges?

Which statement did Niels Bohr make about atoms? A. The atom is made up of smaller particles. B. The energy of an electron depends on its specific orbit. C. The atom has a small, dense center. D. Atoms are different for different elements.

A plane flies toward a stationary siren at 1/4 the speed of sound. Then the plane stands still on the ground and the siren is driven toward it at 1/4 the speed of sound.

A boy throws a ball straight up with a speed of 21.5 m/s. The ball has a mass of 0.19 kg. How much gravitational potential energy will the ball have at the top of its flight?

If the velocity of a moving object doubles, then what else doubles?

Which of the following dose not represent an adaptation that would lead an organism to be successful

Which set of conditions would produce the least favorable soil for growing crops?

A NASA explorer spacecraft with a mass of 1,000 kg takes off in a positive direction from a stationary asteroid.

What are the characteristics of air pressure waves that we hear as sound?