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Sunny_sXe [5.5K]
3 years ago
5

Why is the work output of a machine never equal to the work input? A. Some work input is used to overcome friction. B. Input dis

tance never equals output distance. C. Some work output is used to overcome friction.
Physics
2 answers:
SVETLANKA909090 [29]3 years ago
6 0
The answer is A. <span>Some work input is used to overcome friction. </span>
Reptile [31]3 years ago
3 0

Answer:

A. Some work input is used to overcome friction.

Explanation:

As we know that in real conditions it is not possible to form a surface which do not have any friction or we can say that it is not possible to have a surface which is 100% smooth

So here when a machine absorbs some energy as its input work then some part of this energy is used against frictional force between its moving part and hence the output energy is less than the energy that it absorb.

So output energy is never same as the input energy of a machine.

So correct answer would be

A. Some work input is used to overcome friction.

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hydraulic lift is to be used to lift a 2100-kg weight by putting a weight of 25 kg on a piston with a diameter of 10 cm. Determi
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Answer:

840 cm

Explanation:

Note: A hydraulic press operate based on pascal's principle.

From pascal's principle

W₁/d₁ = W₂/d₂...................... Equation 1

Where W₁ and W₂ are the first and second weight, and d₁ and d₂ are the  first and second diameter of the piston.

make d₁ the subject of the equation

d₁ = W₁×d₂/W₂................ Equation 2

Given: W₁ = 2100 kg, W₂ = 25 kg, d₂ = 10 cm = 0.1 m.

Substitute these values into equation 2

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d₁ = 8.4 m

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3 years ago
Interchangeably means​
ryzh [129]

Answer:

Interchangeable is something that can be used in the same manner as something else without any important differences.

or in a more simple way

something that can be exchange

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3 0
2 years ago
Read 2 more answers
What is the instantaneous velocity of the hummingbird at t=1s?
Liono4ka [1.6K]

The distance - time graph of the humming bird is missing, so i have attached it.

Answer:

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From the attached graph, at time t = 1 s, the corresponding distance is 0.5 m.

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2 years ago
A car tire rotates with an average angular speed of 32 rad/s. In what time interval will the tire rotate 3.5 times? Answer in un
stiks02 [169]

Answer:

\Delta t = 0.687\ s

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