Two stars with about the same mass are found to have transiting planets with similar semi-major axes. Star 1 exhibits a Doppler shift twice as large as Star 2. What can we determine about these two systems?
A) The planet around Star 2 is more massive than the planet around Star 1.
B) The planet around Star 1 has a thicker atmosphere than the planet around Star 2.
C) The planet around Star 1 is more massive than the planet around Star 2.
D) The planet around Star 2 has a thicker atmosphere than the planet around Star 1.
C
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A projectile starts at the coordinate origin, where the displacement vector also originates. The initial velocity, v0, makes an angle ?0 with the horizontal where 0
A.
is parallel to 
.B.
is perpendicular to .C.
is parallel to 
.D.
is perpendicular to .E.
is perpendicular to .According to Galileo, which of these is a "natural" or "unforced" motion?
A) A stone falling straight downward. B) A book coming to rest as it slides along the floor. C) Both of the above. D) Neither of the above.
A melon is projected into the air with 100 J of kinetic energy in the presence of air resistance. When it returns to its initial level its kinetic energy is
A) less than 100 J. B) more than 100 J. C) 100 J. D) need more information
An electric motor on an airplane operates on 21.5 volts and draws a current of 11.0 amperes. How much energy (in joules) does the motor use during a 9.0-hour flight?
a. 1064.4 b. 2128.5 c. 127710.0 d. 7662600.0