Jogging Jake runs at 4 m/s along a train flatcar that moves at 10 m/s in the opposite direction. Jake's speed relative to the ground is
A) 6 m/s.
B) 10 m/s.
C) 14 m/s.
D) none of the above
Answer: A
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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
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A) It was always zero. B) It was never zero. C) It was not zero, but ended up zero. D) none of the above