Doubt from work,power and energy

#1

Example 18 isn't first part wrong calculated how did they took cos@=0 in first part when @=37° given ?

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#2

No, the answer is correct because the angle in Fscos@ is the angle between force applied and the displacement occured.
And here both are parallel to the inclined plane hence the angle between them is 0 that's why cos@ is taken as 1 here.

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#3

Question 1,3 and 4

#4

#5

This is 1 ques



Hope its all clear now.

#6

Question 8,10 and 11

#7

Q8

#8

#9

Q11