KE, PE, Work & Power (Part 2)

A microwave oven does 28000 joules of work in 20 seconds. Then the power of the microwave is

• 1400 watts

• 560000 watts

• 1400 joules

• 560000 Joules

W= 125 J

d = 10 m

F = ???

• 12.5 N

• 1250 N

• 0.08 N

• 135 N

P=25 watts

W=5000 Joules

t=???

• 200 s

• 0.0005 s

• 125000 s

• 125 s

If 68 W of power is produced in 18 seconds, how much work is done?

• 1224 J

• 0.264 J

• 3.77 J

• 12.24 J

How much work is produced when 350 N is used to move a car 5 m?

• 70 J

• 1750 J

• 355 J

• 175 J

W = 500 Joules

t = 25 seconds

P = ???

• 0.05 W

• 20 W

• 12500 W

• 2000 W

If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?

• 272 m

• 17 m

• 4.05 m

• 272 cm

If a group of workers can apply a force of 1,000 Newtons to move a crate 20 meters, what amount of work will they have accomplished?

• 20,000 J

• 200 J

• 2,000 J

• 20 J

Kinetic energy can be calculated using the formula

KE = 1/2mv2. What is the kinetic energy of a bicycle that has a mass of 20 kg and is traveling at a velocity of 10 m/sec?

• 10 J

• 100 J

• 1000 J

• 10000 J

Figure the PE.

mass= 3 kg

gravity= 9.8m/s2

height= 40m

• 1176

• 1716 J

• 1176 J

• 1761