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Tanzania [10]
3 years ago
12

What is the efficiency of a car's engine when heat input is 400,000 joules and

Physics
2 answers:
Aleksandr-060686 [28]3 years ago
5 0
Either 25% or 75%. does it to how much is wasted or the difference in the input and waste?
otez555 [7]3 years ago
3 0

Answer: A. 25%

Explanation: Ap3x

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A force of 8800 N is exerted on a piston that has an area of 0.010 m^2. What is the force exerted by a second piston that has an
professor190 [17]

Explanation:

It is given that,

Force on piston, F₁ = 8800 N

Area, A_1=0.01\ m^2

Area, A_2=0.04\ m^2

Let F₂ is the force exerted on the second piston. Using Pascal's law as :

Pressure at piston 1 = Pressure at piston 2

\dfrac{F_1}{A_1}=\dfrac{F_2}{A_2}

F_2=\dfrac{F_1}{A_1}\times A_2

F_2=\dfrac{8800}{0.01}\times 0.04

F_2=35200\ N

So, the force exerted by a second piston is 35200 N. Hence, this is the required solution.

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3 years ago
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"A bridge, constructed of 11 beams of equal length L and negligible mass, supports an object of mass M.
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F_P  + F_Q = M g
F_P = M g - F_Q
Torque, or moment of force:
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0 = M g L - 3 F_Q L         / : L
0 = M g - 3 F_Q
3 F_Q = M g
F_Q = M g /3
Finally:
F_P = M g - M g/3
F_P = 4 M g / 3

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Answer:

Because the energy is waning

Explanation: hope this helps

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