More practice questions

4. Q4. Express one kilowatt-hour (kWh) in joules.

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   1 kWh = 1000 W × 3600 s = 3.6 × 10^⁶ J.

5. Q5. Convert 60° to radians.

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   60 × π/180 = π/3, about 1.047 rad.

6. Q6. How many standard atmospheres is one bar?

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   1 bar = 10^⁵ Pa and 1 atm = 101 325 Pa, so 1 bar = 10^⁵/101 325, about 0.987 atm.