Worksheet on calculating power in physics, featuring three problems related to work and time.

Let's solve each of the problems step by step using the formula for power:

> Power = Work / Time
> where:
> - Work = Force × Distance (in joules)
> - Time = in seconds
> - Power is measured in watts (W), which is joules per second

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Problem 1:

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

#### Step 1: Calculate work
Work = Force × Distance
= 1,000 N × 3 m
= 3,000 joules

#### Step 2: Use power formula
Power = Work / Time
= 3,000 J / 60 s
= 50 watts

✔ Answer: 50 watts

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Problem 2:

> 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?

#### Step 1: Calculate work
Work = Force × Distance
= 35 N × 10 m
= 350 joules

#### Step 2: Use power formula
Power = Work / Time
= 350 J / 5 s
= 70 watts

✔ Answer: 70 watts

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Problem 3:

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

#### Step 1: Use power formula directly
Power = Work / Time
= 3,750 J / 15 s
= 250 watts

✔ Answer: 250 watts

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✔ Final Answers:

1. 50 watts
2. 70 watts
3. 250 watts

Let me know if you'd like these explained in simpler terms or with diagrams!