Atransport truck pulls on a trailer with a force of 600n [e]. the trailer pulls on the transport truck with a force
a)of zero
b) of less than 600 n is the truck is slowing down
c) equal to 600 n only if the truck is moving at constant velocity
d) equal to 600 n no matter what the acceleration of the truck
e) greater than 600 n if the truck is accelerating

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j ?

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. 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. a) what is the block's initial mechanical energy? 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.

In physics the desire of an object to keep doing what it is doing is termed?