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zlopas [31]
3 years ago
15

‏Calculate the kinetic energies of the following objects moving at the given speeds : ( a ) a 91 kg football linebacker running

at 8.9 m / s ; ( b ) a 4,9 g bullet at 807 m / s ; ( C ) Carrier Moritz , 91,400 metric tons at 23 knots . ( 1 metric ton - 1000 kg , 1 knot - 0.514 m / s )
Physics
1 answer:
damaskus [11]3 years ago
5 0

Answer:

Explanation:

KE = ½mv²

a) KE = ½(91)(8.9²) = 3,604.055 = 3.6 kJ

b) KE = ½(0.0049)(807²) = 1,595.56005 = 1.6 kJ

c) KE = ½(91 400 000)(23(0.514))² = 6,387,017,558.8 = 6.4 GJ

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Could we see a galaxy that is 20 billion light-years away?.
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Answer:

No

Explanation:

20 billion light-years away are beyond our sight and perspective on Earth and wouldn't be observable in our universe.

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Sound waves with a constant frequency of 250 hertz are traveling through air at stp. what is the wavelength of the sound waves
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Answer:

wave length is 1.2m

Explanation:

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2 years ago
Describe two examples of how humans use electromagnetic waves.
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3 years ago
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List two methods by which a community can save water. In your own words, explain how these methods would help to increase the ye
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8 0
3 years ago
The y-component of the force F which a person exerts on the handle of the box wrench is known to be 70 lb. Determine the x-compo
Yuri [45]

Answer:

<em>Fx = 121.24lb</em>

<em>F = 140lb</em>

Explanation:

Since we are not given the angles subtended by the force, we can assume it to be 30 degrees.

The y component of the force expressed by the formula:

Fy = Fsintheta

Given the y-component of the force F to bee 70lb

70lb =  Fsintheta

Get magnitude of the force

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F = 70/0.5

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<em></em>

<em>Note that the angle used was assumed. Other values can as well be used</em>

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2 years ago
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