Mercury, the closest planet to the Sun, has an orbital period that is
1.greater than that of all of the other planets.
2.less than that of all of the other planets.
3.greater than that of some of the planets and less than that of others.
4.equal to one Earth year.
2
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An infinitely long cylinder of radius R = 2 cm carries a uniform charge density ? = 18 ?C/ m3. Calculate the electric field at distance r = 1 cm from the axis of the cylinder
A) 2.5 × 103 N/C B) 5.1 × 103 N/C C) 0 D) 2.0 × 103 N/C E) 10.2 × 103 N/C
A chain reaction can occur
A) in any uranium core. B) when critical mass is reached. C) when critical mass is exceeded. D) in the center of the Sun. E) when the coolant is too hot.
How are speed and velocity related?
a. Speed and velocity are the same. b. Velocity relates to instantaneous speed, but not to average speed. c. Velocity specifies both the speed and the direction of a moving object. d. Velocity relates to very small objects, such as atoms, while speed relates large objects such as cars. e. Velocity is the scientific and technical word for speed.
A cube of wood of density 0.780 g/cm3 is 11.2 cm on a side. When placed in water, what height of the block will float above the surface? (water density = 1.00 g/cm3)
a. 8.74 cm b. 11.2 cm c. 2.46 cm d. 3.46 cm e. 1.46 cm