Question

The work done to push a steel box to a distance of 485 cm is 118.825 joules. a) How much force is applied? b) What is the work done if the force act at θ = 40 ᵒ? C) if steel box is pushed in 35 sec, what is the power in kilowatts and horsepower ?

Answer 1

a)

$$F=\frac{W}{d}=\frac{118.825}{4.85}=24.5\ N$$

b)

$$W'=118.825\cos{40}=91.025\ J$$

c)

$$P=\frac{91.025}{35}=2.6\ W$$