A 40kg rock is perched atop a cliff that is 50 m high. What is it's potential energy?

Which statement correctly describes the nucleus of the atom? The nucleus of the atom contains the electrons. The nucleus of the atom is mostly empty space. The nucleus of the atom surrounds the center of the atom.

Why is it difficult to prove the law of conservation of mass when a gas is produced?

The diagram shows a person holding a bow and arrow. Which will most likely increase the kinetic energy in this system? a not releasing the string b increasing the mass of the arrow c releasing the string d pulling back less on the string

If a ceiling fan is meant for the ceiling, then why do we put it together not on the ceiling?

Helicopter blades withstand tremendous stresses. In addition to supporting the weight of a helicopter, they are spun at rapid rates and experience large centripetal accelerations, especially at the tip.

Why is a block of gold is more dense than a block of iron of equal size?

How much work is required to uniformly accelerate a merry-go-round of mass 1490 kg and a radius of 7.80 m from rest to a rotational rate of 1 revolution per 8.33 s? Model the merry-go-round as a solid cylinder (I = ½ MR2).

What percentage of North American adults may be functioning below their potential due to prolonged exposure to stress

Give a example of frequency which an elephant can hear and a tiger cannot hear include a unit in ansawer

Why do you keep moving forward when you slam on the brakes of your bike?