Planes traveling between Seattle and Tokyo often go near Alaska because
A) the distance is shorter.
B) there is less air traffic to contend with.
C) planes travel faster in cooler air.
D) the plane can stay over the safety of land for longer.
A) the distance is shorter.
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One of the unusual features of the Earth's moon is that it is
A) very large B) very small C) made mostly of rock D) keeps one side facing the Earth
What is the volume, and its approximate uncertainty, of a sphere of radius 1.96 ± 0.01 m?
A) 31.5 ± 0.1 m3 B) 31.5 ± 0.2 m3 C) 31.5 ± 0.3 m3 D) 31.5 ± 0.4 m3 E) 31.5 ± 0.5 m3
Two small cylindrical plastic containers with flat bottoms are placed on a turntable that has a smooth flat surface. Canister A is empty; canister B contains lead shot. Each canister is the same distance r from the center. The coefficient of static friction between the canisters and the turntable is ms. When the speed of the turntable is gradually increased,
a. only the lighter container slides outward off the turntable; the heavier one stays on. b. only the heavier container slides outward off the turntable; the lighter one stays on. c. both containers slide off the turntable at the same turntable speed. d. the lighter container slides inward. e. the heavier container slides inward.
A spaceship carrying a light clock moves at a speed of 0.960c relative to an observer on Earth
If the clock on the ship advances by 1.00 s as measured by the space travelers aboard the ship, how long did that advance take as measured by the observer on Earth? A) 0.96 s B) 1.2 s C) 2.6 s D) 3.6 s E) 5.8 s