d) momentum 38. Which method of heat transfer involves liquids? a) conduction b)
ID: 294344 • Letter: D
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d) momentum 38. Which method of heat transfer involves liquids? a) conduction b) convection c) radiation d) momentum 39. Which method of heat transfer involves gases? a) conduction b) convection c) radiation d) momentum 40. Which two lived in the 20th century and may have met? a) Galileo & Newton b) Hubble & Einstein c) Galileo & Hubble d) Newton &Hubble; 41. A rock weighs 20 g. and has a volume of 10 ml. What is its density? a) 2g/ml b) 4 g/ml c) 200 g/ml d)4 g/cc 42. A bicyclist covers 30 km. in 2 hr. Her speed is? a) 10 km/h b) 15 km/h c) 60 km/h d) 15 mh 43. If a red hot thumbtack is immersed in warm water, the direction of heat flow will will be from a) warm water to the red hot thumbtack.Explanation / Answer
38. Convection method of heat transfer involves liquid.
39. Convection method of heat transfer involves gases.
Convection : The transfer of heat energy through the movement of a mass of substance from one place to another place is called convection. The process of convection becomes effective only in fluids or gases because their internal mass motion activates convection of heat energy.
40. Hubble & Einstein lived in 20th century and may have met.
Edwin Powell Hubble was an American astronomer and liver from 1889 to 1953.
Albert Einstein was a German physicist who lived from1879 to 1955.
41. A rock weights 20 g and has a volume of 10ml. The density of the rock is (20/10) = 2g/ml.
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