Charge of uniform surface density (0.20 nC/m2) is distributed over the entire xy plane. Determine the magnitude of the electric field at any point having z = 2.0 m
a. 17 N/C
b. 11 N/C
c. 23 N/C
d. 28 N/C
e. 40 N/C
B
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White dwarf supernovae are good standard candles for distance measurements because
A) all white dwarf supernovae have about the same peak luminosity. B) all white dwarf supernovae occurred at about the same time in the history of the universe. C) all galaxies have at least one white dwarf supernova each year. D) white dwarf supernovae occur only among very massive stars. E) all white dwarf supernovae start out bright and fade with time.
A racecar goes around a 200 m radius curve at a constant speed of 40 m/s. Its acceleration is __________
Fill in the blank(s) with correct word
A car has a mass of 930 kg has wheels with a radius of 35 cm, and the distance between the axles is 3.1 m. The coefficient of static friction between the tires and the road is 0.52
It is equipped with anti-lock brakes so that the tires do not slide when it is braking. If the weight of the car is supported equally by the four tires, what is the total torque on the tires exerted by the forces between the tires and the horizontal road when there is maximum braking, i.e. when the tires are about to slip? A) 1.2 × 102 N m B) 1.7 × 103 N m C) 1.2 × 104 N m D) 1.6 × 102 N m E) 1.4 × 104 N m
Why use nuclear power on a satellite?
a. It can supply energy for many years on long space missions. b. Solar cells don't work well in the outer solar system far from the sun. c. Sending radioactive materials into space is a good way to get rid of them so they don't create a hazard on earth. d. all of the above