Atemperature of a 50 kg block increases by 15°c when 337,500 j of thermal energy are added to
the block. (chapter 5 - pages 141-142)
a. what is the specific heat of the object? show the appropriate equation from your book
and show your work with units.
c. what is the block made of? use the chart on page 141.
d. is this block a good material for insulators or conductors?

Apassenger walks toward the rear of a moving train. describe her motion as seen from a reference point on the train. then describe it from a reference point on the ground

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.

What is a good example of instantaneous speed