The other solution, d = -0.437 m, can be rejected because d was chosen to be a p

Question

The other solution, d = -0.437 m, can be rejected because d was chosen to be a positive number at the outset. A change in the acrobat's center of mass, say, by crouching as she makes contact with the springboard, also affects the spring's compression, but that effect was neglected. Shock absorbers often involve springs, and this example illustrates how they work. The spring action of a shock absorber turns a dangerous jolt into a smooth deceleration, as excess kinetic energy is converted to spring potential energy.

QUESTION Is it possible for the acrobat to rebound to a height greater than her initial height? Explain. (Select all that apply.)

a.Yes. The acrobat can bend her knees while falling and then straighten them as if jumping when bouncing upward again.

b.No. There is no external source of energy to provide the potential energy at a greater height.

c.No. The kinetic energy that the acrobat gains on the way down is converted entirely back into potential energy when she reaches the initial height.

d.Yes. The acrobat can provide mechanical energy by pushing herself up while in contact with the springboard.

e.Yes. Elastic energy is always present in the spring and can give the acrobat greater height than initially.

Explanation / Answer

a.Yes. The acrobat can bend her knees while falling and then straighten them as if jumping when bouncing upward again.

d.Yes. The acrobat can provide mechanical energy by pushing herself up while in contact with the springboard.

when acrobat muscles does work by strethcing the legs, it can go greater than initial height.

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.