Two frisky otters slide down frictionless hillsides of the same height but different slopes. The slope of the hill of otter 1 is 30°, while the slope of the hill of otter 2 is 60°
If both start from rest, which otter is moving faster when she reaches the bottom of her hill? A) Otter 1 is moving faster.
B) Otter 2 is moving faster.
C) The heavier otter is moving faster, no matter which hill she used.
D) Both otters have the same speed at the bottom.
E) The otter that took the shorter time is moving faster.
D
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The shepherd moons keep the ring particles in their rings by:
A) repelling the ring particles, causing them to slow down. B) repelling the ring particles, causing them to speed up or slow down. C) attracting the ring particles, causing them speed up. D) attracting the ring particles, causing them to speed up or slow down. E) both attracting and repelling the ring particles, causing them to speed up or slow down.
When a tube of diameter d is placed in water, the water rises to a height h. If the diameter were half as great, how high would the water rise?
A) 4h B) h/2 C) 2h D) h/4 E) h
A airplane having a metal surface and a wingspan of 25.0 m flies horizontally at 200. m/s where the earth's magnetic field is vertical with magnitude 45.0 ?T
(a) What emf is induced across the wings? (b) What wingspan would the plane need to produce 1.00-V emf across its wings? (c) The plane now reverses direction. Does the polarity of the wingtip emf change? That is, if the left wing was positive before, does it now become negative?
Of the five rock-forming mineral groups—the silicates, carbonates, oxides, sulfides, and sulfates—which two form economically important ores?
A) silicates and carbonates B) carbonates and oxides C) oxides and sulfides D) sulfides and sulfates