Jupiter is located approximately 5.2 AU away from the Sun. What is the distance in kilometers?
a. 3.7 x 10^7 km
b. 5.2 x 10^8 km
c. 1.4x 10^9 km
d. 7.8 x 10^8 km
e. 8.0 x 10^8 km
d
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Which is always true of an uncharged object?
a. It has no charge whatsoever in any part of its structure. b. It has equal amounts of positive and negative charge. c. It is grounded. d. It is not attracted by a charged object. e. It is composed of positively charged electrons and negatively charge protons.
When we see x-rays from an accretion disk in a binary system, we can't immediately tell whether the accretion disk surrounds a neutron star or a black hole. Suppose we then observe each of the following phenomena in this system. Which one would rule out the possibility of a black hole?
A) intense x-ray bursts B) spectral lines from the companion star that alternately shift to shorter and longer wavelengths C) visible and ultraviolet light from the companion star D) bright x-ray emission that varies on a time scale of a few hours
Estimation: A reasonable estimate for the height of the walls in an ordinary American home is
A. 10 m. B. 8 m. C. 2.5 m. D. 1.5 m.
The kinetic friction force that a horizontal surface exerts on a 60.0-kg object is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?
A) 15.0 m B) 30.0 m C) 375 m D) 750 m