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oksian1 [2.3K]
3 years ago
6

When a surfer rides an ocean wave on her surfboard, she is actually riding on. A. a crest that is toppling over. . B. a trough o

f the wave. . C. the rest position of the wave. . D. a region of rarefaction.
Physics
2 answers:
ruslelena [56]3 years ago
8 0
The right answer to this question is A. a crest that is toppling over. When a surfer rides an ocean wave on her surfboard, she is actually riding on a crest. The crest is the point on a wave with the maximum value or upward displacement within a cycle.
Zanzabum3 years ago
3 0

Answer:

A. a crest that is toppling over.

Explanation:

As we know that at the position of crest in a wave the velocity of motion of molecules is the least velocity or zero velocity

So as the surfer needs the stability he need a point of least velocity and maximum stability

So in that case he has to travel at the position of crest where he can obtain maximum stability and then his speed will be same as the speed of wave propagation in the direction of wave

so here correct answer would be

A. a crest that is toppling over.

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Answer: B. energy

Explanation:

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A person slaps her leg with her hand, which results in her hand coming to rest in a time interval of 2.65 ms from an initial spe
dezoksy [38]

Answer:

the magnitude of the average contact force exerted on the leg is  3466.98 N

Explanation:

Given the data in the question;

Initial velocity of hand v₀ = 5.25 m/s

final velocity of hand v = 0 m/s

time interval t = 2.65 ms = 0.00265 s

mass of hand m = 1.75 kg

We calculate force on the hand F_{hand

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F_{hand × t = m( v - v₀ )

we substitute

F_{hand × 0.00265  = 1.75( 0 - 5.25 )

F_{hand × 0.00265  = 1.75( - 5.25 )

F_{hand × 0.00265  = -9.1875

F_{hand = -9.1875 / 0.00265  

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Using Newton's third law of motion

for every action, there is an equal opposite reaction;

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F_{leg = - ( -3466.98 N )

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While Robert was helping his father in the garden, he pushed a shovel into the ground to dig a hole in the dirt. He picked up a
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Work done is given by the change in kinetic energy of an object

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Reason:

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Therefore;

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Therefore, <u>work is done in the given processes</u>

Learn more about work-energy theorem here:

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