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# All awarded 1 mark o 4 what is the density of air at a

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Unformatted text preview: atitudes close to the equator ANS A o 3. A saturated air mass at 30 C is forced to rise vertically by 1 km and then falls vertically by 1 km. A good estimate of its resulting relative humidity would be: (a) Less than 20% (b) 20-30% (c) 30-40% (d) 40-50% No correct answer provided – was 50- 60%. All awarded 1 mark. o 4. What is the density of air at a temperature of 35 C and a pressure of 101 kPa? Rsp for air = 287 (a) 1.14 gm -3 (b) 10.05 kgm -3 (c) 0.1 kgm -3 (d) 1.14 kgm ANS D -1 -3 5. A mass of air is moving due east on the equator at 20 kmh . It rises up into the air as a result of the Hadley cell system before descending to the Earth’s surface at 30° north of the equator. The Earth has a radius of 6,370km and can be assumed to be a sphere. What speed will this air move at relative to the ground at its new location? Assume a 24-hour day. -1 -1 (a) 20 kmh (b) 223 kmh (c) 243 kmh ANS C -1 (d) 0 kmh -1 CIV300 Terrestrial Energy Systems, 2013F Test 2 Question Sheet 2 6. Earth is slightly wider at the equator than at the poles. One reason is because of: (...
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