Modern automobile headlights are connected in
A) parallel.
B) a perpendicular orientation.
C) series.
D) none of the above
Answer: A
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What are the standard units for luminosity?
A) Watts B) Newtons C) Joules D) kilograms E) Watts per second
A 6.1-g bullet has a velocity of 475 m/s when it penetrates a wooden door to a depth of 3.5 cm. Assuming the frictional force that stops the bullet is constant, how long does it take from the time the bullet hits the door till it comes to a stop?
a. 1.5E–4 s b. 7.4E–5 s c. 4.5E–2 s d. 3.7E–3 s
You find a coin resting on your physics book cover and notice that when you open the cover, the coin slips exactly when the cover reaches 25 degrees above the horizontal. What is the coefficient of friction between the coin and book cover?
A. 0.20 B. 0.23 C. 0.37 D. 0.47 E. The question cannot be answered without knowing the coin's mass.
An astronomical unit (AU) is equal to the average distance from the Earth to the sun, about 92.9 × 106 mi. A parsec (pc) is the distance at which 1 AU would subtend an angle of 1 second of arc. How many miles are there in a parsec?
What will be an ideal response?