Question
A woman pushes a lawn mower with a con-
stant force of 112 Newtons at an angle of
37 with respect to the horizontal. The lawn
mower moves at a speed of 20 cm/sec.
What is her power output? (1 hp = 746
Watts)
1. 0.040 hp
2. 0.024 hp
3. 0.034 hp
4. 0.020 hp
5. 0.030 hp
6. 0.044 hp
stant force of 112 Newtons at an angle of
37 with respect to the horizontal. The lawn
mower moves at a speed of 20 cm/sec.
What is her power output? (1 hp = 746
Watts)
1. 0.040 hp
2. 0.024 hp
3. 0.034 hp
4. 0.020 hp
5. 0.030 hp
6. 0.044 hp
Answers
Damon
horizontal force = 112 cos 37
speed = .2 m/s
power = 112 cos 37 * .2 = 17.9 Watts
17.9/746 = 0.024 Hp
speed = .2 m/s
power = 112 cos 37 * .2 = 17.9 Watts
17.9/746 = 0.024 Hp