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3 years ago

Explain why the output work for any machine cant be greater than the input work

Physics

1 answer:

Gre4nikov [31]3 years ago

7 0

Answer:

When you input force to do work, the output work cannot be greater than what is

put in, because work is energy, and energy is 'conserved'. That means it can't be

created out of nothing.

Explanation:

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A “point-light walker” wears lights on different body locations. When viewed in a dark room, an observer would perceive a(n):

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Answer:

person when the point-light walker is moving

Explanation:

A point light walker is an arrangement of dots that moves in a way that mimics a human walking. This is used in the field of Biological Motion Perception.

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2 years ago

What happens to a wave when it moves from one medium to another?

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3 years ago

10. A hockey puck with mass 0.3 kg is sliding along ice that can be considered frictionless. The puck’s velocity is 20 m/s when

SVEN [57.7K]

Answer:

$d = \frac{v^2_i}{2a}= \frac{(20m/s)^2}{2* 3.43 m/s^2}=58.309m$

Explanation:

For this case we can use the second law of Newton given by:

$\sum F = ma$

The friction force on this case is defined as :

$F_f = \mu_k N = \mu_k mg$

Where N represent the normal force, $\mu_k$ the kinetic friction coeffient and a the acceleration.

For this case we can assume that the only force is the friction force and we have:

$F_f = ma$

Replacing the friction force we got:

$\mu_k mg = ma$

We can cancel the mass and we have:

$a = \mu_k g = 0.35 *9.8 \frac{m}{s^2}= 3.43 \frac{m}{s^2}$

And now we can use the following kinematic formula in order to find the distance travelled:

$v^2_f = v^2_i - 2ad$

Assuming the final velocity is 0 we can find the distance like this:

$d = \frac{v^2_i}{2a}= \frac{(20m/s)^2}{2* 3.43 m/s^2}=58.309m$

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3 years ago

9. Which of the following statements is true about scientific theories?

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I think the correct answer from the choices listed above is option D. Scientific theories summarize patterns found in nature. Although, the statement scientific theories are never proven is somewhat true. They are either disproved or they are never disproved. Hope this answers the question.

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3 years ago

Read 2 more answers

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fredd [130]

Answer:

Frequency, $f=2.18\times 10^9\ Hz$