1. A person does 100 ft lb of work to move a hand truck 20 ft in 60 s. a) How mu

Question

1.A person does 100 ft lb of work to move a hand truck 20 ft in 60 s.

a)How much force is exerted?

b)What is the person’s velocity in SI units?

2.A person exerts a 50-lb force to move a hand truck 100 ft in 45 s.

a)How much work is done?

b)What is the power in ft lb/s and hp delivered by the person?

3.What is the horsepower of a hydraulic motor with a 25 lb force, 2 ft moment arm and 1800 rpm?

4.How much torque is delivered by a 5-hp, 1200 rpm hydraulic motor?

5.What is the rpm if a torque of 100 ft lb is delivered by a 60-hp hydraulic motor?

6.An elevator raises a 2000-lb load through a distance of 20 ft in 25 s. If the efficiency of the entire system is 75%, how much input horsepower is required by the elevator hoist motor?

7.If a hydraulic horse power of 15.2 must be delivered by a fluid to the cylinder to produce an output horsepower of 7.5 for driving the load. What is the efficiency of the cylinder?

8.A hydraulic pump delivers oil at 75 Lpm and 1000 kPa. How much hydraulic power does the pump deliver in English units?

9.Determine the torque delivered by a hydraulic motor if the speed is 1500 rpm and the mechanical output power is 10kW.

a.If the input power is 20 hp, what is the efficiency?

Oil is flowing through a 10-m diameter pipe at 25 liters per minute (Lpm). Determine the velocity.

Explanation / Answer

Q1.

a)
W = F*d
=> 100 lb.ft = F*20 ft
=> F = 100/20
= 5 lb

b)
v = d/t
=> v = 20 ft/60 s
=> v = 0.33 ft/s
1 ft/s = 0.3048 m/s
So,
v = 0.102 m/s

Pls post other ques separately

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