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3 years ago

ASAPPP

Physics

2 answers:

katen-ka-za [31]3 years ago

8 0

Power is the rate at which work is done (2nd option)

frozen [14]3 years ago

5 0

Answer:

Power is the rate at which work is done.

Explanation:

The work done divided by total time taken is called power of an object. The SI unit of power is watts. It is denoted by W. Its expression is given by :

$P=\dfrac{W}{t}$

Since, W = F.d

$P=\dfrac{F\times d}{t}$

Since, $\dfrac{d}{t}=v$

$P=F\times v$

It is also equal to the product of force and velocity. Hence, the correct option is (c).

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vaieri [72.5K]

<u>B</u> option is correct .

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3 years ago

If there were no air resistance, how long would it take a free-falling skydiver to fall from a plane at 3500 m to an altitude of

xxMikexx [17]

By equation of motion we have S = ut + 0.5 a $t^{2}$

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3 years ago

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Alecsey [184]

Answer:

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(b) The escape speed is 10394 m/s

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The full calculation can be found in the attachment below.

Explanation:

In both parts (a) and (b) the energy conservation equation were used. Assumption was made that when the object is very far from the planet the distance from the planet's center approaches infinity and the gravitational potential energy approaches zero.

The calculation can be found below.

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mart [117]

Answer:

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Explanation:

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where

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For the sonar signal in this problem,

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