Power Equations

A set of pulleys is used to lift a piano weighing 1,000 newtons.  The piano lifted 3 meters in 60 seconds  How much power is used?

• 16.67 watts
• 50 watts

How much power is used if a force of 35 newtons is used to push a box a distance of 10 meters in 5 seconds?

• 70 watts
• 1750 watts

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

• 56, 250 watts
• 250 watts

Tags

CCSS.7.RP.A.3

How much work is done using a 500 watt microwave oven for 5 minutes? (must convert minutes to seconds first)

• 150,000 J

• 2500 J

How much work is done using a 60 watt light bulb for 1 hour? (convert hours to seconds)

• 60 J

• 216,000 J