1. Potential energy and a roller coaster. A 1000-kg roller coaster car moves from point A to B then C. (a) What is the potential energy at B and C
relative to A?

(b) What is the change in potential energy
as it goes from B to C?

(c) What is the potential energy at B and C relative to point C?

(d) What is the change in potential energy as it goes from B to C?

Which of the following is the main energy source for the sun? a. fission of hydrogen b. fusion of hydrogen c. fusion of helium d. fission of iron

The energy equivalent of the rest mass of an electron is

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 740 n/m. it is initially at rest on an inclined plane that is at an angle of theta= 26 with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is uk = 0.17. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. the block's initial mechanical energy is 9.472 j.b. if the spring pushes the block up the incline, what distance l in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.