Drew demonstrated the \'suicide pendulum\' in class. A 2kg boll was attached to

Question

Drew demonstrated the 'suicide pendulum' in class. A 2kg boll was attached to a 5m long string, pulled to an angle of 35 degree above vertical, and released. What was the tension in the string right as the mass passes through its lowest position? A tennis ball of mass 57g is travelling at 10m/s in the negative x direction when it is hit by a tennis racquet. The ball is in contact with the racquet for 0.057 sec. The tennis ball leaves the racquet going 30m/s in the positive x direction (x unit vector). What average force was applied to the ball by the racquet?

Explanation / Answer

at lowest position

Tension T = mg

T = 2 * 9.8

T = 19.6 N ( 20 N)

option C:

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Impulse J = force * time = change in momentun

J = F t = (mv-mu)

F = 0.057 * (10-30)/(0.057

F = -20 N x

option A

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