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DiKsa [7]
1 year ago
12

While working out, a man performed 500 J of work in 8 seconds. What washis power?A. 4000 WB. 62.5 WC. 500 WD. 38.5 W

Physics
1 answer:
Sav [38]1 year ago
5 0

Given:

The work done by the man is W = 500 J

The time taken by the man is t = 8 s

To find the power.

Explanation:

The power can be calculated by the formula

P=\frac{W}{t}

On substituting the values, the power will be

\begin{gathered} P=\text{ }\frac{500}{8} \\ =\text{ 62.5 W} \end{gathered}

Thus, the power is B. 62.5 W

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A 1kg skateboard sits at the top of a ramp 20 fr off the ground . How much potential energy does it have ?
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Answer:

196J

Explanation:

Given parameters:

Mass of skateboard  = 1kg

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Unknown:

Potential energy  = ?

Solution:

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It is mathematically expressed as:

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An image that appears upside down behind the focal point is an image that is reflected on a concave mirror. Mirrors reflect different kinds of images based on the placement of an object that is reflected towards it. There are two kinds of mirrors, concave and a convex mirrors, the latter makes objects seem smaller and farther than where it is exactly.
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3 years ago
The mass of a hypothetical planet is 1/100 that of Earth and its radius is 1/4 that of Earth. If a person weighs 600 N on Earth,
omeli [17]

To solve this problem we will apply the Newtonian concept of gravitational acceleration produced by a planet. This relationship is given by:

g = \frac{GM}{r^2}

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G = Gravitational Universal Constant

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The values given are based on the constants of the earth, so they can be expressed as

M_p = \frac{1}{100} M_e

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The relationship of gravity would then be given:

g_e = \frac{GM_e}{r_e^2}

The relationship with the new planet, from the gravity of the earth would be given

g_p = \frac{GM_p}{r_p^2}

g_p = \frac{G(1/100)M_e}{(1/4 r_e)^2}

g_p = \frac{GM_e 16}{100 r_e^2}

g_p = 0.16 \frac{GM_e}{r_e^2}

g_p = 0.16g_e

The relationship with the weight of the earth would be given as:

W_e = m*g_e = 600N

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3 0
3 years ago
Your little sister (mass 25 kg) is sitting in her little red wagon (mass 8.5 kg) at rest. You begin pulling her forward, acceler
Nata [24]

Answer:

Your little sister (mass 25.0  ) is sitting in her little red wagon (mass 8.50  at rest. You begin pulling her forward and continue accelerating her with a constant force for 2.35  at the end of which time she's moving at a speed of 1.80  .

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4 0
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Two bodies made of the same material have same external dimension and appearance, but one is compact solid and other is hollow.
Bumek [7]

Answer:

Different

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The hollow one will expand even more making it have a larger volume then the solid one so they are different

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