Work Energy and Power Test

Result

Work Energy and Power Test - 10

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
1 / -0

A 0.800-kg ball is tied to the end of a string 1.60 m long and swung in a vertical circle. (a) During one complete circle, starting anywhere, calculate the total work done on the ball by (i) the tension in the string and (ii) gravity

A
25 J, -25 J

B
10 J, 10 J

C
30 J, 30 J

D
0, 0

Solution

Work done by conservative force in round trip will be zero (displacement = 0).

So that work done by tension and gravity will be zero.
Question 2
1 / -0

A tandem (two-person) bicycle team must overcome a force of 165 N to maintain a speed of 9.00 m/s. Find the power required per rider, assuming that each contributes equally.

A
798 W

B
742.5 W

C
765 W

D
702 W

Solution

Total power required to overcome a force of 165 N and to maintain a speed of 9.00 m/s

F = 165N

v = 9m/s

P = Fv = 165 × 9 = 1485W

if each rider contribute equal power, then power required per rider will be P/2 = 1485/2 = 742.5W