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3 years ago

Which of the following describes what needs to occur in order to reduce force while doing the same amount of work?

1 answer:

5 0

Among the choices the choices the one that describes what needs to occur in order to reduce force while doing the same amount of work is <span> the distance over which the force is exerted must decrease. The answer is B.

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Are you for or against using nuclear energy?

Alecsey [184]

Answer:

Against but it really depends on the situation

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3 years ago

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at certain times the demand for electric energy is low and electric energy is used to pump water to a reservoir 45 m above the g

Readme [11.4K]

The mass of water that must be raised is $5.25\cdot 10^7 kg$

Explanation:

Since the process is 70% efficiency, the power in output to the turbine can be written as

$P_{out} = 0.70 P_{in}$

where $P_{in}$ is the power in input.

The power in input can be written as

$P_{in} = \frac{W}{t}$

where

W is the work done in lifting the water

t = 3 h = 10,800 s is the time elapsed

The work done in lifting the water is given by

$W=mgh$

where

m is the mass of water

$g=9.8 m/s^2$ is the acceleration of gravity

h = 45 m is the height at which the water is lifted

Combining the three equations together, we get:

$P_{out} = 0.70 \frac{mgh}{t}$

Where

$P_{out} = 150 MW = 150\cdot 10^6 W$

And solving for m, we find:

$m=\frac{Pt}{0.70gh}=\frac{(1.50\cdot 10^6)(10800)}{(0.70)(9.8)(45)}=5.25\cdot 10^7 kg$

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3 0

3 years ago

Plzzzzzzz help me<br> 15 pt for 1st 10 for 2nd

maks197457 [2]

Mass is the right answer

8 0

2 years ago

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Explain why, in terms of forces, there is a risk of head injury when diving from this height. Suggest why the high divers would

podryga [215]

Answer:

Due to lower risk of injury or damage.

Explanation:

The high divers would choose to enter the water from the feet first because there is low risk of injury. The brain is the most important part of the body which very sensitive to any small injury. Small injury to brain leads to big problems in life. High divers can reach speeds of nearly 60 mph and enters about 28m into the water in about three seconds which can damage the head region if comes in contact with the ground so this is the reason the high divers avoid of entering in the water through their heads and choose entering through their feet.

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3 years ago

Which is most important in the use of a camera photofl ash unit, the intensity of the light (the energy per unit area per unit t

maria [59]

Answer:

intensity of the light (the energy per unit area per unit time)

Explanation:

The photoflash capacitor is an electrolytic capacitor that is also used in flash cameras, professional illumination and solid-state laser supply. Their general purpose is to briefly power a high-voltage flash tube, which can be used to illuminate photographic material or to alternately pump a laser rod.
Since the flash tube requires very little time to operate, photoflash capacitors are designed to supply high discharge current pulses without excessive internal heating.

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3 years ago