This figure shows the force on a 0.1-kilogram mass at various distances from Earth. Notice that the force decreases as the square of the distance. Now, consider satellites A and B, both circling Earth. If A has ten times the mass of B but B is 1/10 of the distance to the center of Earth as is A, what is the gravitational force on A relative to that of B due to Earth?
a. 1/10 the amount.
b. The two are equal.
c. 10 times as much.
d. 1/100 times as much.
e. 100 times as much.
a
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Index of Refraction: Light of wavelength 550 nm in air is found to travel at 1.96 × 108 m/s in a certain liquid. (c = 3.0 × 108 m/s)(a) What is the index of refraction of this liquid?(b) What is the frequency of the light in air?
What will be an ideal response?
A lens has a refractive power of -1.50. What is its focal length?
A. 150 cm B. -150 cm C. 67.0 cm D. -67.0 cm E. 8.50 cm
An E galaxy contains
a. mostly lower-main sequence stars and giants. b. mostly upper main sequence stars and giants. c. mostly upper main sequence stars and gas and dust. d. roughly equal numbers of upper and lower main sequence stars. e. mostly white dwarfs and supergiants.
A car accelerates from rest to 30 km/h. Later, on a highway it accelerates from 30 km/h to 60 km/h. Which takes more energy, going from 0 to 30, or from 30 to 60?
(a) 0 to 30 km/h. (b) 30 to 60 km/h. (c) Both are the same.