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egoroff_w [7]
3 years ago
7

A man pushes an 250-N crate at constant speed a distance of 30.0 m upward along a rough slope that makes an angle of 60° with th

e horizontal. The work done by the force of gravity is:
Physics
1 answer:
mel-nik [20]3 years ago
8 0

Answer:

6495.19 Joule

Explanation:

F = Weight of the crate = 250 N

d = Distance the cart is pushed = 30 m

θ = Angle of inclination = 60°

The weight of the crate will be resloved into two components

Fdsinθ and Fdcosθ

Work done by the force of gravity is

W = Fdsinθ

⇒W = 250×30×sin60

⇒W = 6495.19 Joule

∴ The work done by the force of gravity is 6495.19 Joule

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MatroZZZ [7]
The answer is A

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5 0
3 years ago
A 21 N block rests on a horizontal surface. The coefficients of static and kinetic friction between the surface and the block ar
Georgia [21]

Answer:

a)15 N

b)12.6 N

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Given that

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We know that

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Frs= 0.8 x 21 = 16.8 N

Value of kinetic friction

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Frk= 0.6 x 21 = 12.6 N

a)

When T = 15 N

Static friction Frs= 16.8 N

Here the value of static friction is more than tension T .It means that block will not move and the value of friction force will be equal to the tension force.

Friction force = 15 N

b)

When T= 35 N

Here value of tension force is more than maximum value of static friction that is why block will move .We know that when body is in motion then kinetic friction will act on the body.so the value of friction force in this case will be 12.6 N

Friction force = 12.6 N

8 0
3 years ago
When measuring an unknown voltage with an analog VOM, you should first
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If you have no idea what the voltage is that you're about to measure,
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8 0
3 years ago
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A solenoid with an air core has a magnetic field pointing along its axis in the positive x direction. This solenoid is then fill
trapecia [35]

Answer:

we can say that with a smaller magnitude , the field will point is in same direction

Explanation:

we have given that

solenoid is filled with a diamagnetic material and with air, magnetic field pointing along its axis in the positive x direction

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6 0
3 years ago
A boulder released by a rockslide rolls 60 m in 4 s. What is its average speed?
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5 0
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