calculating power

A set of pulleys is used to lift a piano weighing 400.67 newtons.  The piano lifted 10.4 meters in 45.3 seconds  How much power is used?

• 16.67 watts

• 50 watts

• 91.68 watts

An elevator does 12,000 newton·meters of work in 11.0 seconds. What is the power used by the elevator?

•  1,090 watts
• 1,000 watts
• 1,100 watts
• 1,009 watts

What is the power of a kitchen blender if it can perform 3,750 Joules of work in 15 seconds?

• 250 W

• 0.004 W

• 56,250 W

• 25 W

How do you calculate power?

• P = W/t
• P = E/t
• P = w * t
• P = bbq/chicken

What is the correct unit for power?

• Watt

• Joules

• Newtons

• seconds

How much power is used if a force of 35 Newtons is used to push a box a distance of 10 meters in five seconds? (Hint: Solve for work first. This is a 2-step problem.)

• 70 W

• 3.5 W

• 7 W

• 350 J

Tags

NGSS.HS-PS2-1

Calculate the power for the following problem: w: 253 J; t: 10 s

• 25.3 W
• 25.5 W
• 25.6 W
• 25.2 W

Calculate the power for the following problem: w=350 J; t:20 s

• 18.5 W
• 16.5 W
• 17.5 W
• 20.5 W

A girl weighs 400 N. She runs up a flight of stairs of height 5 m in 4 seconds. Her power is:

• 320 W

• 400 W

• 500 W

• 2 000 W

How much time is needed to produce 720 Joules of work if 90 watts of power is used? 

• 0.125 s
• 8 s
• 64800 s
• 80 s