b) red hot thumbtack to the warm water. c) no heat flow d) not enough informatio

Question

b) red hot thumbtack to the warm water. c) no heat flow d) not enough information. 44. When stringing telephone lines between poles in the summer, it is advisable to allow the lines to a) sag. b) be taut c) be close to the ground d) allow ample space for birds. 45. Which melts faster in sunshine-dirty snow or clean snow? a) Dirty snow b) Clean snow c) Both of the above. d) None of the above. 46. When the mass of an object is compared to its volume,the concept is a) mass b) weight c) volume d) density 47. Which would change if you took a rock from Earth to Mars? a) mass b) weight c) volume d) density 48. A sheet of paper can be quickly withdrawn from under a soft-drink can without the can toppling, because a) gravity pulls harder on the can than on the paper b) the can has weight. c) the can has inertia. d) none of the above. 49. A moving object has

Explanation / Answer

44-telephones lines in the summer are longer and shorter in a cold winter hence they sag more.

So sag is correct

45-dirty snow because it absorbs more sunlight whereas clean snow reflect more

46-density because density=mass/volume

47-weight is change because W=mass×gravity

48-because the can has inertia

49-moving object has kinetic energy

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