2. During a biceps curl, the relative angle at the elbow changes from 0 to 150°

Question

2. During a biceps curl, the relative angle at the elbow changes from 0 to 150° for each curl (elbow flexion). What is the total angular distance moved in the 4 bice curls? 3. A thrower spins with an angular velocity of 530°/s. The distance from his axis of rotation to the center of gravity of the 8kg hammer is 1.9m. What is the linear velocity of the hammer head? 4. During a hamstring curl exercise, the relative knee angle at .5 seconds was 10 and then .71 seconds the knee angle was at 120. What was is the angular velocity at the knee? 5. An 8 year old boy picks up an adult baseball bat (80cm) and tries to swing it without "choking up". He manages to get 195 /s of angular velocity. When he chokes up he

Explanation / Answer

Part (3)

v = R*w

= 1.9*530*2*pi / 360

= 17.56 m/s

Part (6)
Given that
v = 15 m/s

r1 = 25 cm = 0.25 m

r2 = 15 cm = 0.15 m

We know that

ac = (v^2/r)

a1 = (15^2/0.25)

= 900 m/s^2

a2 = (15^2/0.15)

= 1500 m/s^2

Since a2 > a1

second cyclist with radius 15 cm have more likely to fall

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