- #1
serverxeon
- 101
- 0
Homework Statement
Sand is placed onto a horizontal conveyor belt.
rate of sand placed = 0.5 kg s-1
velocity of conveyor belt = 2 m s-1
a) what is the power supplied by the system to keep the velocity constant?
b) what is the rate of change of KE by the sand
c) why is the answer in a and b different?
--------------------------
I know the answer to part (a) comes from
P = Fv = dp/dt * v = dm/dt * v2 = 2W
and the answer to part (b) is
just 1/2* (m/t) * v2 = 1W
my question is, where does the other 1W goes to?
2W is inputted, but only 1W goes into the KE of the sand!