Lesson_1.5_Homework

# Lesson_1.5_Homework - Lesson 1.5 Homework 1 A 100-m steel...

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Lesson 1.5 Homework 1. A 100-m steel measuring tape was marked and calibrated at 20 o C. At a temperature of 30 o C, what is the percentage error in a 100 m distance when using this tape? 2. A copper electrical cable of length 0.50 km is strung over a river between two electrical pylons. If the temperature changes from –10 o C to 40 o C between winter and summer, by how much does the length of the cable change? 3. A stretched 1.0-m long wire is tuned to play the middle C (261.6 Hz). (i) If the tension in the wire is kept constant, what increase in length will cause a change in frequency of 0.2 Hz? (ii) If the wire is made of steel, what temperature change is needed to achieve this change in length? 4. A clock has a pendulum supported by a steel wire. The pendulum has a period of 1.0 s at 0 o C. (i) What will be its period at 30 o C ? (ii) How many minutes per day will it gain or lose at 30 o C? 5.

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Lesson_1.5_Homework - Lesson 1.5 Homework 1 A 100-m steel...

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