A boat moves at 11.0 m/s relative to the water. If the boat is in a river where the current is 2.00 m/s, how long does it take the boat to make a complete round trip of 1000 m upstream followed by a 1000 m trip downstream?
a. 188 s
c. 208 s
b. 205 s
d. 222 s
A
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Kirchhoff's Rules: Kirchhoff's loop rule is a statement of
A. the law of conservation of momentum. B. the law of conservation of charge. C. the law of conservation of energy. D. the law of conservation of angular momentum. E. Newton's second law.
A 5.00 kg ball is traveling at 4.0 m/s and strikes a wall. The ball bounces off the wall with a velocity of 4.0 m/s in the opposite direction. If the contact with the wall by the ball lasts for 0.10 seconds, then the magnitude of the impulse on the ball is
A. 24 kg m/s. B. 30 kg m/s. C. 36 kg m/s. D. 40 kg m/s. E. 50 kg m/s.
If you toss a ball straight upward at 40 m/s with no air resistance, one second after it reaches the top of its path its speed is
A) zero. B) 10 m/s. C) 20 m/s. D) 30 m/s E) 40 m/s.
A positive ion has a deficiency of
A) electrons. B) neutrons. C) negative ions.