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mshah3
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Homework Statement
You push a block of lead across the floor, applying a horizontal force of 9 N. The block moves at a constant speed. The mass of the block is 1.5 kg and the heat capacity of lead is 130 J/(kg K). After pushing the block a distance of 20 m, you measure its temperature and find that it has increased by 0.3 K.
In answering the following problems, state explicitly your choice of system!
(a) What is the change in thermal energy of the block?
(b) How much work is done by the frictional force of the floor acting on the block?
(c) What is the change in the thermal energy of the floor?
Homework Equations
Etherm = mC deltaT
Etherm = Force * delta r = W
The Attempt at a Solution
PART A : i was thinkin mCdeltaT
Part B: either -Fd or could be zero since the force is perpendicular to motion
Part C: work minus etherm maybe
****need help asap*****THANKS