Consider a star with 2 planets. The mass of planet A is the same as the mass of planet B. The orbit of Planet A is on average, closer to the star than the orbit of Planet B. Which of the following statements is true?
A) Planet A moves with the same speed as Planet B.
B) Planet A is, on average, moving slower than Planet B.
C) The relative orbital speeds depend on the masses of the planets.
D) Planet A is, on average, moving faster than Planet B.
D
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Jets from compact objects are explained by the effect of _____
a. magnetic fields b. gravitational waves c. angular momentum d. mass transfer e. pulsar winds
Potential Energy: Two tiny grains of sand having charges of 4.0 ?C and -4.0 ?C are situated along the x-axis at x1 = 2.0 m and x2 = -2.0 m. What is electric potential energy of these grains relative to infinity? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. -36 mJ B. 36 mJ C. 0 J D. -72 mJ E. 72 mJ
By what factor larger is a 12 inch pizza than a 10 inch pizza?
A. 1.2 B. 1.1 C. 1.4 D. 1.6
The electric field in a region of space is given by Ex = (3.0x) N/C, Ey = Ez = 0, where x is in m. Points A and B are on the x axis at xA = 3.0 m and xB = 5.0 m. Determine the potential difference VB?VA.
A. ?24 V B. +24 V C. ?18 V D. +30 V E. ?6.0 V