Solar power is the rate at which
A) the Sun emits energy.
B) solar energy is received from the Sun.
C) the atmosphere absorbs energy.
D) all of the above
E) none of the above
Answer: B
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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
Which of the following best describes why the Sun emits most of its energy in the form of visible light?
A) Nuclear fusion in the Sun's core produces visible light photons. B) The Sun's gas is on fire like flames from wood or coal, and these flames emit visible light. C) Like all objects, the Sun emits thermal radiation with a spectrum that depends on its temperature, and the Sun's surface temperature is just right for emitting mostly visible light. D) The visible light comes from energy level transitions as electrons in the Sun's hydrogen atoms jump between level 1 and level 2.
A car travels around an unbanked curve at 17 m/s. If the static friction coefficient between the tires and the road is 0.45, what is the minimum radius curve that the car can take at this speed without slipping?
A. 65 m B. 3.9 m C. 15 m D. 8.1 m
A metal bar is 20 cm long and has a rectangular cross-section measuring 1.0 cm × 2.0 cm. What is the voltage drop along its length when it carries a 4000-A current? The resistivity of the metal is 1.68 × 10-8 ? ? m
A) 0.067 V B) 0.67 V C) 0.034 V D) 0.34 V