First slide

Second law

Question

Gravel is dropped into a conveyor belt at a rate of 0.5 kg/s. The extra force required in newton to keep the belt moving at 2 m/s is:

Easy

A

1
B

2
C

4
D

0.5

Solution

$F = v \frac{dm}{dt} = (2) (0 .5) = 1 N$

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