Posted by **Einstein** on Friday, December 14, 2007 at 1:50pm.

A 65 kg dancer leaps .32 m high.

a) With what momentum does the dancer reach the ground?

b) What impulse is needed to make a stop?

c) As the dancer lands, the knees bend, lengthening the stopping time to .050 s. Find the average force exerted on the body.

d) Compare the stopping force to the performer's weight.

Thoughts: Momentum equals mass multiplied by the change in velocity. Impulse is the force multiplied by time.

- Physic -
**drwls**, Friday, December 14, 2007 at 2:06pm
a) Use energy conservation considerations to compute the takeoff velocity.

(1/2) M V^2 = M g H

V = sqrt (2gH)

The landing velocity will be the same. Multiply that V by M for the momentum

(b) Same number as (a)

(c) Force = Impluse/Time

(d) Compare (c) answer to Mg

- Physic -
**Einstein**, Friday, December 14, 2007 at 5:47pm
A) Momentum = (2.465)(65) = 160.222 kgm/s

B) 160.222 kgm/s

C) Force = 160.222/.050 = 3204.441 N

D) 3204.441/[(65)(9.8)] = 5.031

## Answer this Question

## Related Questions

- science - A 52.0 kg male dancer leaps 0.37 m high. (a) With what momentum does ...
- Statistics -- Probability - I need to calculate P(man is a ballet dancer and a ...
- English - Identify the predicate adjective Katy Beth remains the best dancer in ...
- Physics - A dancer completes 3.8 revolutions in a pirouette. What is her angular...
- Physics - A dancer completes 3.4 revolutions in a pirouette. What is her angular...
- physics help please - A dancer completes 3.4 revolutions in a pirouette. What ...
- Physics - A dancer completes 3.4 revolutions in a pirouette. What is her angular...
- language arts - the ballet dancer seemed to be gliding through the air. what ...
- grammar - what is the predicate adjective and participle in this sentence? ...
- the human body - What are the four arm muscles? Im studying to be a dancer so i ...

More Related Questions