What is Pluto's moon Charon thought to have in common with our own Moon?
A) It probably formed as a result of a giant impact.
B) It has the same basic composition.
C) It has the same approximate mass.
D) It has the same average density.
A
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If a galaxy has a radial velocity of 8000 km/sec and the Hubble constant is 70 km/sec/Mpc, what is the distance to this galaxy?
a. 8.75 x 103 Mpc b. 2.4 x 109 Mpc c. 5.6 x 105 Mpc d. 114 Mpc e. 8.75 x 10-3 Mpc
Coulomb's Law: Three identical 3.0-µC charges are placed at the vertices of an equilateral triangle that measures 30 cm on a side. What is the magnitude of the electrostatic force on any one of the charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 1.6 N B. 1.8 N C. 2.0 N D. 2.2 N E. 2.4 N
The composition of a planet's atmosphere be measured during a transit by analyzing
A) the excess absorption of starlight at specific wavelengths. B) the excess emission of starlight at specific wavelengths. C) the length and depth of the dip in light during the transit. D) the amplitude and period of the star's motion. E) the wobble in a star's position on the sky.
Two charged objects are separated by a distance d. The first charge is larger in magnitude than the second charge
A) The first charge exerts a larger force on the second charge. B) The second charge exerts a larger force on the first charge. C) The charges exert forces on each other equal in magnitude and opposite in direction. D) The charges exert forces on each other equal in magnitude and pointing in the same direction.