Astudent whirls a rubber stopper attached to a string in a horizontal circle above her head. if the radius of the stopper in circular motion is a constant 50.00 cm, and the time it takes the stopper to make one full revolution is 0.2500 seconds, what is the tangential speed of the stopper?

Explanation:

As we know that the radius of the circular motion is given as

time period of the motion is given as

now we know that it is moving with uniform speed

so it is given as

now plug in all data

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg

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