When do comets generally begin to form a tail?
A) inside Mercury's orbit
B) between Mercury and Earth's orbit
C) beyond Jupiter's orbit
D) inside of Jupiter's orbit
E) They always have a tail (until they run out of material).
D
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A convex mirror has a focal length of ?20 cm. What is the position of the resulting image (in cm) if the image is upright and four times smaller than the object?
a. ?100 b. ?25 c. ?50 d. ?15 e. ?10
At its brightest, Venus, at magnitude -4, is 100 times brighter than a 1st magnitude star
Indicate whether the statement is true or false
Which of these two collisions is more damaging; driving into a concrete wall with no "give," or colliding head-on with an identical car moving toward you at your same speed?
A) collision with the car B) collision with the wall C) both the same
A mass m = 2.0 kg is attached to a spring having a force constant k = 290 N/m as in the figure. The mass is displaced from its equilibrium position and released. Its frequency of oscillation (in Hz) is approximately
?
?
a.
12.
b.
0.50.
c.
0.010.
d.
1.9.
e.
0.080.