Sunday

August 31, 2014

August 31, 2014

Posted by **Anonymous** on Thursday, February 3, 2011 at 12:42pm.

(a) Compute the force of the ground on his feet if he jumps stiff-legged, the ground compresses 2.20 cm, and the compression of tissue and bones is negligible.

(b) Compute the force his legs exert on his upper body (trunk, arms, and head), which weighs 2.50 102 N, under the conditions assumed above.

(c) Now suppose that his knees bend on impact, so that his trunk moves downward 44.0 cm during deceleration. Compute the force his legs exert on his upper body.

**Related Questions**

Physics - A boy starts at rest and slides down a frictionless slide as in the ...

physics - an 80 kg boy holding on to a helium balloon jumps off of a 20m tall ...

Tough Math - Suppose the ball was 3.24 feet above ground when it was hit, and ...

PHYSICS - Ms. Anderson shoots an arrow straight up into the air. The arrow ...

Physics! - Ms. Anderson shoots an arrow straight up into the air. The arrow ...

Physics - Mr. Anderson shoots an arrow straight up into the air. The arrow ...

Math - Can you please help me with a math problem Suppose the ball was 3.24 feet...

Physics - An athlete with a mass of 62 kg jumps and lands on the ground on his ...

physics - a rock weighing 20.0N falls from a height of 16.0m and sinks 0.600 m ...

Physics - A cannon shoots a shell straight up. It reaches its maximum height, ...