Thermal energy transfer Quiz
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5 questions, one answer each
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1. How much energy is needed to raise 0.50 kg of a metal ( J kg⁻¹ K⁻¹) by 40 K?
- A. 1.8 × 10⁴ J
- B. 4.5 × 10⁴ J
- C. 3.6 × 10⁴ J
- D. 1.1 × 10³ J
2. During boiling at constant temperature, which of the following increases?
- A. Mean kinetic energy of the molecules
- B. Potential energy of the molecules
- C. Temperature
- D. Mass of the liquid
3. A system gains 200 J by heating and has 80 J of work done on it. What is ?
- A. +120 J
- B. −120 J
- C. +280 J
- D. −280 J
4. A 3.0 kW heater supplies a steady flow of water at 0.020 kg s⁻¹ with no losses. What is the temperature rise? ( J kg⁻¹ K⁻¹)
- A. 36 K
- B. 15 K
- C. 0.028 K
- D. 72 K
5. The specific latent heat of fusion of ice is J kg⁻¹. How much energy melts 0.40 kg of ice at 0 °C?
- A. 8.4 × 10⁵ J
- B. 1.3 × 10⁵ J
- C. 3.3 × 10⁵ J
- D. 1.3 × 10⁶ J