Which of the following is true about high-energy mechanical devices?
a. they usually need to be kept warm in order to preserve mechanical energy.
b. they usually need to be cooled to dissipate thermal energy build-up and prevent damage.
c. they usually convert radiant energy into electrical energy.
d. during an energy conversion, none of the energy is transferred as thermal energy because the devices are free of friction.

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.