Choose the one alternative that best completes the statement or answers the ques

Question

Choose the one alternative that best completes the statement or answers the question. The Earth is closer to the Sun in January than in July, which accounts for the fact that the highest high tides in the Northern Hemisphere occur in summer. Winter. spring. none of the above. A mosquito flying at 3 m/s that encounters a breeze blowing at 3 m/s in the same direction has a speed of 6 m/s. 0 m/s. 4 m/s. 3 m/s. A tightrope walker more easily balances on a tight wire if her pole is short but heavy. droops. is held high. A boy plays solitary seesaw by placing the seesaw's fulcrum one-eighth the distance from where he sits at one end. Which weighs more? the seesaw the boy they have equal weights need more information If the Moon had twice as much mass and still orbits earth at the same distance. ocean bulges on Earth would be not significantly different. smaller. unequal in size. larger. none of the above Two people one twice as massive as the other, attempt a tug-of-war with 12 meters of rope on frictionless ice. After a brief time, they meet. The heavier person slides a distance of 3 m. 4 m. 0 m. 6 m. Passengers in a high-flying jumbo jet feel their normal weight, while passengers in an orbiting space vehicle do not. because passenger in the space vehicle are above Earth's atmosphere. beyond the main pull of Earth's gravity. without support forces. all of the above none of the above

Explanation / Answer

1) B During early winter when the Moon which has a greater effect on tides then the Sun is near its perigee (closest to Earth) and either full or new.

2) v = 3 +3 = 6 m/s

3) A

The heavy weights allow the tightrope walker to exert torque by simply rotating the pole slightly, which moves his/her center of mass the other way, helping recenter him- or herself directly over the tightrope.

4) boy's weight is more because his distance fro fulcrum is less, Torque should be equal = r x F

5) D larger because Force will be more F = gMm/d^2

6) 4m

center of mass remains same, distance travelled by larger man is half of travelled by smaller man

L + 2L = 12

L = 4 m

7) beyond the main pull of gravity

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