7-65. A box of
apples (mass 22 kg) slides down a ramp inclined at 44° to the
horizontal.
The
fiction force on the box has a magnitude of 79 N. If the box starts
from
rest and slides
2.5
m along the ramp, determine: (a) the work done by friction
(b)
the box's final kinetic energy (using conservation of energy)
(c) the thermal energy produced.
[Ans.
(a) -2.0X102J (b) 1.8X102 J (c) 2.0X102
J]
We need a good
picture of the situation. Which drawing represents the problem?
