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Vadim26 [7]
2 years ago
15

Reading glasses use what property of light waves

Physics
1 answer:
tresset_1 [31]2 years ago
5 0
Visible range of electromagnetic radiation
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Where do you think the government should put the greatest support: solar energy, wind energy, clean coal, oil exploration, gas e
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80N force ;
lutik1710 [3]

The power of the engine is 320 W.

<u>Explanation:</u>

Power may be defined as the rate of doing work (or) work done per unit time. One unit of energy is used to do the one unit of work.

                          Power = Work done / Time taken

Given, Force = 80 N,    height = 5 m , final velocity = 4 m/s

To calculate the power, we must know the time taken.

To find the time, use the distance and speed formula which is given by

                              Time = Distance / speed

Here distance = 5 m and speed = 4 m/s

                              Time = 5 / 4 = 1.25 s.

Now,          Power = work done / time

                              = (F * d) / t  = (80 * 5) / 1.25

                  Power = 320 W.

The standard unit of power is watt (W) which is joule per second.

                                                               

4 0
3 years ago
A weightlifter lifts a 1,250 N barbell 2 m in 3 s. How much power was used to lift the barbell?
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brainly.com/question/1478685 
5 0
3 years ago
Someone help me please i need to finish this
Ilya [14]

Answer:

D. A zinc Zn contains 30 protons inside the nucleus and 30 electron outside the nucleus

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A toy gun uses a spring to project a 5.9-g soft rubber sphere horizontally. The spring constant is 8.0 N/m, the barrel of the gu
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Answer:

Explanation:

Stored energy in spring = 1/2 k x² , k is spring constant , x is compression.

= 1/2 x 8 x (5.7 x 10⁻²)²

= 129.96 x 10⁻⁴ J

Energy lost due to friction = force x distance

= .035 x .17

= .00595 J

Energy used in providing kinetic energy to projectile.  

129.96 x 10⁻⁴  - .00595

.012996 - .00595

= .007046 J

So

1/2 m v² = .007046

v² = .007046  x 2 / .0059

= 2.3885

v = 1.545 m /s

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3 years ago
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