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3 years ago

Define work and power. How are work and powerrelated?

Physics

1 answer:

Ahat [919]3 years ago

6 0

Work is done by using energy, and power is the rate at which

work is done

Explanation:

Work occurs when a force (F) acts on an object to move it some

distance (d) from the start point

Work is the energy needed to apply a force to move an object a

particular distance, where force is parallel to the displacement

→ Work = Force × Distance

The unit of work is joule (N.m)

Power is the rate of change of work

→ Power = Work ÷ Time

The unit of power is watt (N.m/s)

Work is done by using energy, and power is the rate at which

work is done

→ Work = Force × Distance

→ Power = Work ÷ Time

Substitute the work rule in the power rule

→ Power = (Force × Distance) ÷ Time

→ Distance ÷ Time = Speed

→ Power = Force × speed

Work is done by using energy, and power is the rate at which

work is done

Learn more:

You can learn more about work and power in brainly.com/question/7956557

#LearnwithBrainly

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Answer:

100 divide by 400 times 100 percent

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3 years ago

What is the peak emf generated by rotating a 940-turn, 24 cm diameter coil in the Earth’s 5·10−5 T magnetic field, given th

elena-14-01-66 [18.8K]

Answer:

The peak emf generated by the coil is 2.67 V

Explanation:

Given;

number of turns, N = 940 turns

diameter, d = 24 cm = 0.24 m

magnetic field, B = 5 x 10⁻⁵ T

time, t = 5 ms = 5 x 10⁻³ s

peak emf, V₀ = ?

V₀ = NABω

Where;

N is the number of turns

A is the area

B is the magnetic field strength

ω is the angular velocity

V₀ = NABω and ω = 2πf = 2π/t

V₀ = NAB2π/t

A = πd²/4

V₀ = N x (πd²/4) x B x (2π/t)

V₀ = 940 x (π x 0.24²/4) x 5 x 10⁻⁵ x (2π/0.005)

V₀ = 940 x 0.04524 x 5 x 10⁻⁵ x 1256.8

V₀ = 2.6723 V = 2.67 V

The peak emf generated by the coil is 2.67 V

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3 years ago

At time t1 = 14 s, a car is located at 99, 80, 27 m and has velocity 4, 0, −3 m/s. At time t2 = 18 s, what is the position of th

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Answer:

115, 80, 15m

Explanation

t1 = 14s

t2 = 18s

change in time = 4s (18-14)

r(final) = r(initial) + (average velocity) x (change in time)

multiply the average velocity with the change in time

= (4, 0, -3) x 4 = 16, 0, -12

now we'll add this value to the initial position of the car

(99, 80, 27)m + (16, 0, -12)m = (115, 80, 15)m

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4 years ago

An athlete runs a 100 m race in 10 seconds against a friction force of 100N. How do I work out his power output?

Rashid [163]

They seem to cancel each other out which is odd

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3 years ago

A conducting rod moves perpendicularly through a uniform magnetic field. How does the emf change if the magnetic field is increa

Marysya12 [62]

Answer:

c) It increases by a factor of 8

Explanation:

According to Faraday's law (and Lenz' law), the induced EMF is given as the rate of change of magnetic flux.

Mathematically:

V = -dФ/dt

Magnetic flux, Ф, is given as:

Ф = BA

where B = magnetic field strength and A = Area of object

Hence, induced EMF becomes:

V = -d(BA)/dt or -BA/t

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The EMF has increased by a factor of 8.

5 0

3 years ago

Define work and power. How are work and powerrelated?​

Define work and power. How are work and powerrelated?