Question

Name: . How much energy (work) is expended to move an object 30' with a force of 5 lbs? 2. How many feet can an object be moved with 50 ft. lb. of energy if it takes 2.5 Ibs of force? A 60w light bulb will use a specific amount of energy in 30 minutes. How many meters can you move a car with the same amount of energy if it takes 200 Newtons of force to move it? 4. Our Skyhawks use 160 horsepower engines. If we connected the engine to a generator and assume that there is no energy loss due to friction or resistance, how many 200 watt light bulbs could we light? 5. be problem? 6. The IDGs (lntegrated Drive Generators) in a 767 produce 110 kilo Watts. What horsepower engine would we need to turn the IDG? 7. At max output at 115 volts, how much current is being produced in problem 62 pass a given point in the output wire of IDG in problem 6 in one second at maximum output?

Answer 1

2.

W = work done = 50 ft. lb

d = distance moved

F = force acting = 2.5 lbs

distance moved is given as

d = W/F

d = 50/2.5

d = 125 ft

3.

P = power of the bulb = 60 Watt

t = time of operation of bulb = 30 min = 30 x 60 sec = 1800 sec

Electrical energy consumed by the bulb is given as

E = P t

W = work done to move

F = force applied = 200 N

d = distance moved = ?

work done to move is same as the electrical energy consumed

hence

W = E

work done is given as

W = F d

E = F d

P t = F d

d = P t/F

d = 60 x 1800/200

d = 540 m