The voltage induced in self-inductions is
A) always in a direction opposing the changing voltage that produced it.
B) likely higher than the changing voltage that causes it.
C) both of these
D) neither of these
Answer: C
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A runner runs 10 m from the origin toward the WEST to point A. He then runs from point A 20 m more toward the WEST to point B. He then runs from point B 30 m more toward the EAST to point C. The runner's total displacement from the origin to point C is
A. 60 m toward the WEST. B. 50 m toward the EAST. C. 20 m toward the WEST. D. 10 m toward the EAST. E. 0 m.
A 30-year-old woman takes a trip on a rocket, leaving her 20-year-old brother behind. She travels at a speed of 0.8 c, and is gone 20 years, according to the younger brother. When she returns, how many years older/younger is she than her brother?
a. 2 years younger b. 2 years older c. 3 years older d. 10 years older e. 8 years older
A heat engine has an efficiency of 35.0% and receives 150 J of heat per cycle. How much heat does it exhaust in each cycle?
A. zero B. 52.5 J C. 97.5 J D. 150 J
A foul ball is hit straight up into the air with a speed of 30 m/s, and air effects are negligible. (a) Calculate the time required for the ball to rise to its maximum height
(b) Calculate the maximum height reached by the ball above the point where it hit the bat. (c) Determine the times at which the ball passes a point 25 m above the point where it was hit by the bat. (d) Explain why there are two answers to part (c).