A mosquito flying at 3 m/s that encounters a breeze blowing at 3 m/s in the opposite direction has a speed of
A) 0 m/s.
B) 3 m/s.
C) 4 m/s.
D) 6 m/s.
Answer: A
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If a nitrogen atom and a slightly heavier oxygen atom have equal average speeds, which has the greater kinetic energy?
A) nitrogen B) oxygen C) both the same D) need more information
Mary and Debra stand on a snow-covered roof. They both throw snowballs with the same initial speed, but in different directions. Mary throws her snowball downward, at 30° below the horizontal; Debra throws her snowball upward, at 30°
When the snowballs reach the ground below, A) Debra's snowball will have a higher speed than Mary's. B) Mary's snowball will have a higher speed than Debra's. C) Both snowballs will hit the ground with the same speed. D) Debra's snowball never hits the ground since it is thrown upwards. E) Mary's snowball never hits the ground since it is thrown downwards.
Why is the nucleosynthesis era so important in determining the chemical composition of the universe?
A) We can study the processes that occurred during the nucleosynthesis era to determine how most of the elements in the universe were created. B) By knowing how much matter was created during the nucleosynthesis era, we can determine whether the universe is open or closed. C) We can observe spectra from this era to determine what the primordial mix of the elements was at the beginning of the universe. D) All the elements except hydrogen were produced in the nucleosynthesis era. E) Except for a small amount of elements heavier than helium produced later by stars, the chemical composition of the universe is the same now as at the end of the nucleosynthesis era.
At what altitude should a satellite be placed into circular orbit so that its orbital period is 48.0 hours? The mass of the earth is 5.976 × 1024 kg and the radius of the earth is 6.378 × 106 m
A) 4.22 × 107 m B) 7.58 × 107 m C) 8.22 × 107 m D) 6.07 × 107 m E) 6.71 × 107 m