A limitation of all electric automobiles is
A. Low energy density per battery.
B. Batteries explode more readily than gasoline.
C. Electric energy is not useful for autos.
D. Electric motors are less efficient than gasoline motors.
Answer: A. Low energy density per battery.
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Light takes 4.3 years to travel from Alpha Centauri (the star closest to the Sun) to the Earth. If a spaceship traveling near the speed of light were to make the same trip, the time to travel this distance as measured by the astronauts would be
A. 4.3 years. B. less than 4.3 years. C. a little more than 4.3 years. D. longer than the lifespan of a human being.
The fresh, newly created surfaces of icy satellites of Jovian planets
a. appear dark in color with few impact craters. b. appear dark in color with many impact craters. c. appear very bright because fresh ice is very reflective. d. generally show long bright grooves and a modest number of impact craters. e. generally have small volcanoes that are active.
A car heading north suddenly collides at an intersection with a truck of the same mass heading east. If they lock together and travel at 28 m/s at 15° north of east just after the collision, how fast was the car initially traveling?
A) 14 m/s B) 7 m/s C) 11 m/s D) 28 m/s
Charge of uniform density 4.0 nC/m is distributed along the x axis from x = -2.0 m to x = +3.0 m. What is the magnitude of the electric field at the point x = +5.0 m on the x axis?
a. 16 N/C b. 13 N/C c. 19 N/C d. 26 N/C e. 5.0 N/C