Q1 a evaluate the temperatures of a blue star and a blue, Ask an Expert

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Q1. a) Evaluate the temperatures of a blue star and a blue jacket/ coat, by using 'order of magnitude' estimates for temperatures of these two objects.

b) Elucidate the cause of any differences in temperatures of the two blue objects above.

Q2. Two boats start together and race across a 62-km-wide lake and back. Boat A goes across at 62 km/h and returns at 62 km/h. Boat B goes across at 31 km/h, and its crew, realizing how far behind it is getting, returns at 93 km/h. Turnaround times are negligible, and the boat that completes the round-trip first wins.

(a) Which boat wins? (Or is it a tie?)

boat A
boat B
It's a tie.
By how much?

(b) What is the average velocity of the winning boat?

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