A 5-kg boulder sits on the edge of a cliff 30 m above the roadway. What is the gravitational potential energy of the boulder on the cliff?

A rocket, which is in deep space and initially at rest relative to an inertial reference frame, has a mass of 50.2 * 105 kg, of which 12.5 * 105 kg is fuel.

The sweeping second hand on your wall clock is 16 cm long. Assume the second hand moves smoothly. Part A What is the rotational speed of the second hand? Express your answer in radians per second to two significant figures.

Which of the following best summarizes Dalton's atomic theory? A. All matter is made of the same type of atoms. B. All matter is made of atoms that may change the way in which they are combined during a chemical reaction. C.

A solid weighs 277.5 g in air and 212.5 g when totally immersed in the liquid of density 0.9 g / cc. Calculate the density of the solid.

How does the rotation speed vary as you move outward for a person sitting on a playground merry go round? How about the force here, how does this change?

A circuit with a current of 400 amp has several lights that have a total resistance equal to 30 ohms. Find the voltage.

How many neutrons does element x have if it's atomic number is 35 and it's mass number 71

The potential difference between the terminal of an electrical heater is 60v when it draw a current 4A fron the source. What current will the heater draw if the potential difference is increased to 120v?

Which answer choice best explains why nuclear reactions release more energy than chemical reactions? Electrostatic forces of repulsion are thousands of times stronger than gravitational forces.

A train's mass is 18181.81 kg. What is its weight?