Estimating physical quantities Quiz
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5 questions, one answer each
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1. What is the order of magnitude of 4.2×10⁻⁵ m?
- A. 10⁻⁵ m
- B. 10⁻⁴ m
- C. 10⁻⁶ m
- D. 10⁻³ m
2. A human hair is about 10⁻⁴ m wide and an atom is about 10⁻¹⁰ m across. About how many atoms lie across a hair?
- A. 10⁴
- B. 10⁵
- C. 10⁶
- D. 10⁷
3. A bath holds about 0.2 m³ of water of density 10³ kg m⁻³. What is the mass of the water to the nearest order of magnitude?
- A. 10² kg
- B. 10¹ kg
- C. 10³ kg
- D. 10⁴ kg
4. A 70 kg person climbs stairs 3 m high in 5 s. What is the useful power to the nearest order of magnitude?
- A. 10⁰ W
- B. 10¹ W
- C. 10² W
- D. 10³ W
5. Which statement about an order-of-magnitude estimate is correct?
- A. It is accurate to within 1%
- B. It is the power of ten nearest to the value
- C. It always rounds down
- D. It must include an SI prefix