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antiseptic1488 [7]
2 years ago
6

Does the work required to lift a book to a high shelf depend on how fast you raise it? does the power required to lift the book

depend on how fast you raise it? explain.
Physics
1 answer:
tatiyna2 years ago
6 0

Answer:

No

Explanation:

According to the formula W=Fx, the work done only depends on the Force applied to the book(the gravitational force of the book) and the distance to lift, which is a constant. The velocity doesn't matter.

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A player kicks a football from ground level with an initial velocity of 27.0 m/s, 30.0° above the
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Answer:

Option B. 2.8 s

Explanation:

The following data were obtained from the question:

Initial velocity (u) = 27 m/s

Angle of projection (θ) = 30

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The time of flight of the ball can be obtained as follow:

T = 2uSineθ / g

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T = 2 × 27 × 0.5 / 9.8

T = 27 / 9.8

T = 2.8 s

Therefore, time of flight of the ball is 2.8 s

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