How much heat is emitted when a body of mass 200g cools from 37°C to 31°C? (specific heat capacity of the body = 0.4Jg-1K-1,)
A. 4800J B. 1200J C. 480J 7° D. 202J E. 80J Correct Answer: Option C = 480J Explanation H= mCθ = 200 x 0.4 x 6 = 480J
The average kinetic energy of the molecules of a perfect gas is directly proportional to the?
A. pressure exerted by the gas B. volume of the gas molecule C. Kelvin temperature of the gas D. volume of the gas container E. Celcius temperature of the gas Correct Answer: Option E – Celcius temperature of the gas
An object is heated from 30°C to 57°C. The increases in its temperature on the kelvin scale is?
A. 17k B. 27k C. 81k D. 246k E. 300k Correct Answer: Option E – 300k Explanation 57°C – 30°C = (27 + 273) = 300k
A ball of mass 5.0kg hits a smooth vertical wall normally with a speed of 2ms‾¹ and rebounds with the same speed. Determine the impulse experienced by the ball?
A. 20.0kgm-1 B. 5.0kgm-1 C. 1.3kgm-1 D. 0.0kgm-1 E. 10.0kgm-1 Correct Answer: Option A – 20.0kgm-1Products
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