PHYSICS HIGH SCHOOL

A hair dryer uses 72,000 joules of energy in 60 seconds. What is the power of this hair dryer?

Answers

Answer 1
Answer:

The power of an object is the rate of work done or energy. Here, the energy used by the hair dryer is 72000 Joules. Hence, the power used by the dryer is 1200 watt.

What is power ?

The power of an object is a physical quantity that, measures the rate of the work done by the object or the energy used by the object. The energy used is equal to the work done by it. Hence both have the same standard unit of joule.

Power is the work done or energy divided by time. Hence, the unit of power is J/s which is equivalent to watt.

hence power = work done or energy / time

Given the energy used by the hair dryer = 72000 Joules

time  = 60 seconds.

then, power = 72000 J/60 s = 1200 watt.

Therefore, the power used by the dryer is 1200 watt.

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Answer 2
Answer:

Answer:

1200 Watts is the answer

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How does the law of conservation of energy apply to machines?Machines create energy from scratch.

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Answers

Energy transferred to a machine equals energy transferred from it. It is because according to conservation of energy we can't create or destroy energy so, energy remains constant however, their form can be change by machine's

In short, Your Answer would be Option C

Hope this helps!

Answer:

Energy transferred to a machine equals energy transferred from it. It is because according to conservation of energy we can't create or destroy energy so, energy remains constant however, their form can be change by machine's

Hope this helps!

Explanation:

In short, Your Answer would be Option C

If the rifle is stopped by the hunter’s shoulder in a distance of 3.16 cm, what is the magnitude of the average force exerted on the shoulder by the rifle? Answer in units of N.
mass of bullet= 0.0137 kg
velocity of bullet= 546 m/s to the right
mass of rifle= 3.82 kg
recoil speed of the rifle as the bullet leaves the rifle= 1.958167539 m/s

Answers

Answer:

F = 231.77N

Explanation:

Given the following data

Distance of Hunter's shoulder (d) = 3.16cm = 0.0316m

mass of bullet (m1) = 0.0137 kg

velocity of bullet (v1) = 546 m/s

mass of rifle(m2)= 3.82 kg

Velocity of rifle (V2) = 1.958167539 m/s

Momentum = MV

Momentum is conserved

Since we are looking for the force exerted on the shoulder by the rifle

Work done = Force × distance (F×d)

The rifle possessed kinetic energy = 1/2mV²

Therefore, work done = kinetic energy

F×d = 1/2mv²

F = 0.5mv²/d

By substitution we have

F = 0.5×3.82×1.9582²/0.0316

F = 7.324/0.0316

F = 231.77N
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In which state of matter are particles packed tightly together and stay in fixed positions?

Answers

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Answers

Force=mass x acceleration
Data:
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answer: the acceleration is 2 m/s²

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Answers

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Answers

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