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iragen [17]
3 years ago
11

A 110-pound person pulls herself up 4.0 feet. This took her 2.5 seconds. How much power was developed?

Physics
2 answers:
mrs_skeptik [129]3 years ago
5 0

Answer:

0.32 Hp is the answer. right

lesya [120]3 years ago
4 0

Answer: Power developed by her is <u><em>0.32 hp</em></u>

 

Explanation:

Work done , W= Force(F) X Displacement (d) in the direction of force

Thus work done , W=Fd=110\times 4.0 ft-lbf = 440 ft-lbf

Now 1.0 ft-lbf = 1.355 joules of energy

Therefore , work done, W= 440x 1.355 J = 596.2 J

Average Power , P=\frac{work done(W)}{time (t)}

=> P=\frac{596.2}{2.5} watts = 238.5 watts

We know 746 hp = 1.0 watts

=> P=\frac{238.5}{746} hp=0.32 hp

Thus average power developed by her is 0.32 hp

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A block of mass 5 kg is descending with a constant velocity on an inclined plane at 30°. What is the value of the frictional for
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Answer:28.9N

Explanation:

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F=UR F=1/√(3) ×50

F=28.9N

4 0
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Which statements best describe x-rays? check all that apply. x-rays are electromagnetic waves. x-rays are longitudinal waves. x-
igor_vitrenko [27]

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3 0
3 years ago
Read 2 more answers
The acceleration due to gravity is 9.81 m/s2, towards the Earth. Rain falling from an altitude of 9,000 m would fall for about 1
Anna [14]

Answer:

the final speed of the rain is 541 m/s.

Explanation:

Given;

acceleration due to gravity, g = 9.81 m/s²

height of fall of the rain, h = 9,000 m

time of the rain fall, t = 1.5 minutes = 90 s

Determine the initial velocity of the rain, as follows;

h = ut + \frac{1}{2} gt^2\\\\9000 = 90u +  \frac{1}{2} (9.8)(90)^2\\\\9000 = 90u + 39690\\\\90u = -30690\\\\u = \frac{-30690}{90} \\\\u = -341 \ m/s

The final speed of the rain is calculated as;

v^2 = u^2 + 2gh\\\\v^2 = (-341)^2 + 2(9.8\times 9000)\\\\v^2 = 292681\\\\v = \sqrt{292681} \\\\v = 541 \ m/s

Therefore, the final speed of the rain is 541 m/s.

3 0
3 years ago
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Consider a cylindrical crew module with a diameter of 5 meters, a length of 15 meters, and a crew of 6 people. The module contai
UNO [17]

Answer:

  294.524 m^3

Explanation:

The volume of a cylinder is given by the formula ...

  V = πr^2h

For a radius of 2.5 m and a length of 15 m, the volume is ...

  V = π(2.5 m)^2(15 m) = 93.75π m^3 ≈ 294.524 m^3

The volume is about 294.52 cubic meters.

7 0
3 years ago
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