Help me with this! I do not understand it! I will give brainliest! Is it A B C or D
2 answers:
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Answer:
80%
Explanation:
Thermal efficiency is a measure of the extent to which a heat engine is able to convert to other form. It is measure in percentage.
Thermal efficiency = × 100%
Where is the input energy and
is the output energy.
Given that: = 2400 J and
= 3000 J, therefore:
Thermal efficiency = × 100%
= 80%
The thermal efficiency of the engine is 80%.
Answer:
Incomplete question but the closest ans is
A) The displacement is not zero
Explanation:
For work to be done, the direction of force has to be parallel to or in the same direction as the displacement, this can then be calculated by
θ
Where θ is the angle between direction of force and direction of displacement
By this equation,
if Force is zero, W is zero
if displacement is zero, W is zero
if force and displacement are perpendicular θ=90, cosθ = 0
So A is the cloest choices