Work = Force x displacement
Force= 20N
Displacement= 0.75m
W= 20(0.75)
W= 15 Nm
Hey this is what i found on the internet
<span>
specific heat (Cp) - the heat required to raise the temperature of the unit mass of a given substance by a given amount (usually one degree)
the equation related to this theory is
</span><span>Q=m Cp </span>ΔT<span>
Where Q is the energy gained or lost from the system
m is the mass of the object
</span><span> Cp is the specific heat of the material
</span>ΔT <span>is the change in temperature</span>
Answer:
.
Explanation:
The efficiency of a machine is the ratio between the useful output and the energy input:
Rearrange this equation to find energy input in terms of efficiency and useful output:
.
Substitute in the values: 
and 
. Evaluate to find the value of 
:
.
(Rounded to two significant figures as in the value of efficiency.)
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700 N in the direction of the engine
