A car's speed 3 seconds after accelerating from rest at 2 m/s2 is
A) 2 m/s.
B) 3 m/s.
C) 4 m/s.
D) 6 m/s.
Answer: D
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A parallel-plate capacitor has a voltage V = 6.0 V between its plates. Each plate carries a surface charge density ? = 7.0 nC/m2. What is the separation of the plates?
A) 8.2 mm B) 2.5 mm C) 1.2 mm D) 5.6 mm E) 7.6 mm
A magician can make a candle look as if it is burning under water by focusing light from a candle flame burning in air directly on top of an underwater candle. To do this you want to use a (Hint: eliminate those that cannot work.)
A. concave mirror farther than one focal length from the burning candle. B. a convex mirror farther than one focal length from the burning candle. C. a biconcave lens farther than one focal length from the burning candle. D. a concave mirror closer than one focal length to the burning candle. E. a convex lens closer than one focal length to the burning candle.
Two point charges of + 30.0 ?C and - 9.00 ?C are separated by a distance of 20.0 cm. A +7.00 ?C charge is placed midway between these two charges. What is the electric force acting on this charge because of the other two charges?
A) 0.453 N directed towards the negative charge B) 2.45 N directed towards the negative charge C) 2.45 N directed towards the positive charge D) 245 N directed towards the positive charge E) 245 N directed towards the negative charge
To estimate the central temperature of the Sun, scientists ________
A) use hot gas to create a small Sun in a laboratory B) send probes to measure the temperature C) monitor changes in Earth's atmosphere D) use computer models to predict interior conditions