Answer:
efficiency = 5.4%
Explanation:
Efficiency of heat engine is given as

now we will have

so we will have

now we know that

so we have



so efficiency is 5.4%
Answer:
40N
Explanation:
Using the newton's second law of motion
\sum Fx = max
Fm - Ff = max
Fm is the applied force
Ff is the frictional force
m is the mas of the cupboard
ax is the acceleration
Since the speed from the lorry is steady, ax = 0m/s^2
Also Ff = 40N
Substitute into the formula;
Fm - 40 = m(0)
Fm - 40 = 0
Add 40 to both sides
Fm - 40 + 40 = 0 + 40
Fm = 40N
Hence the force with which the man applied to push is 40N
The X component of the vector is 11.5 while the Y component is 9.6.
<h3>What are the components of a vector?</h3>
We know that a vector must posses both magnitude and direction. Now the vector could be resolved into the vertical and the horizontal components of the mixture.
In resolving this vector;
X component = 15 cm cos 40 degrees = 11.5
Y component = 15 cm sin 40 degrees = 9.6
Thus the X component of the vector is 11.5 while the Y component is 9.6.
Learn more about vectors:brainly.com/question/13322477
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