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gogolik [260]
3 years ago
5

Assume that a person bouncing a ball represents a closed system. Which statement best describes how the amounts of the ball's po

tential and kinetic energy change? O A. The ball's potential energy decreases as it rises and its kinetic energy increases. B. Both the kinetic and potential energy of the ball increase. O C. The ball's kinetic energy increases as it falls and its potential energy decreases. O D. Both the kinetic and potential energy of the ball decrease.​
Physics
1 answer:
Masja [62]3 years ago
6 0

Answer:

I believe the answer is <em>C.</em>

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How do the prefixes micro,<br> nano and pico relate to each<br> other?
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pshichka [43]
B. Kinetic energy increases, potential energy decreases.
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A man drags a 71-kg crate across the floor at a constant velocity by pulling on a strap attached to the bottom of the crate. The
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Answer:

T = 540 N   (to two significant digits)

Explanation:

Let the crate dimension L be from strap attachment to floor contact

Let T be the strap tension

sum moments about the floor contact point to zero

mg[½Lcos25] - Tsin61[Lcos25] + Tcos61[Lsin25] = 0

L is common to all terms, so divides out.

½(71)(9.8)cos25 = T(sin61cos25 - cos61sin25)

T = (71)(9.8)cos25 / (2(sin61cos25 - cos61sin25))

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7 0
3 years ago
14. A ball initially at rest rolls without slipping
elena-s [515]

Answer:

v = √(10gh/7)

Explanation:

Initial gravitational energy = final rotational energy + kinetic energy

PE = RE + KE

mgh = ½ Iω² + ½ mv²

For a solid sphere, I = ⅖ mr².

For rolling without slipping, ω = v/r.

mgh = ½ (⅖ mr²) (v/r)² + ½ mv²

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10/7 gh = v²

v = √(10gh/7)

7 0
3 years ago
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