When the number of turns in a solenoid and its length are both doubled, the ratio of the magnitude of the new magnetic field inside to the magnitude of the original magnetic field inside is what?
A. 0.25
B. 0.50
C. 1
D. 2
E. 4
Answer: C
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Which of these hypothetical observations (none of them are real) would force us to reconsider our modern, Sun-centered view of the solar system?
a. We discover a small planet beyond Saturn that rises in the west and sets in the east each day. b. We find that we are unable to measure any parallax for a distant galaxy. c. We discover an Earth-sized planet orbiting the Sun beyond the orbit of Pluto. d. We discover that the universe is actually contracting, not expanding.
A car starts from rest and travels a distance of 100 m in 15 seconds with a constant acceleration. The average velocity of the car for the 15 seconds interval is
A. 24.0 m/s. B. 21.0 m/s. C. 16.7 m/s. D. 13.3 m/s. E. 6.67 m/s.
A vertical cylindrical cylinder, closed at the bottom end, is fitted at the top with a piston, which can move freely
The mass of the piston is 10.0 kg and the initial height of the piston above the bottom of the cylinder is 25 cm. A mass of 8 kg is placed on the piston. What is the resulting height of the piston, assuming that the temperature is kept constant? A) 12 cm B) 13 cm C) 14 cm D) 15 cm E) 16 cm
A 1000-kg car accelerates at 2 m/s2. What is the net force exerted on the car?
A) 500 N B) 1000 N C) 1500 N D) 2000 N E) none of these