The origin of the glow from the filament inside the ac incandescent lamp in your bedroom is
A) electrons resupplied by the wall outlet.
B) electrons already in the filament.
C) the positive charges that flow in the filament.
D) resistance in the filament.
Answer: B
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As the illuminated part of the Moon grows larger from new to full, it is said to "wane"
a. True b. False Indicate whether the statement is true or false
Which expression gives the speed of light v in a substance in terms of the index of refraction n of a substance and the speed of light c in a vacuum?
a. v = c/n b. v = c n c. v = c + n d. v = n/c e. v = c/n2
From the center outward, the correct order of the zones of Earth is
A. liquid core, solid core, crust, mantle, atmosphere. B. liquid core, solid core, mantle, crust, atmosphere. C. solid core, liquid core, mantle, crust, atmosphere. D. solid core, mantle, liquid core, crust, atmosphere.
A 2.0-kg block slides on a rough horizontal surface. A force (P = 6.0 N) is applied to the block as shown. The magnitude of the block's acceleration is 1.2 m/s2. What is the magnitude of the force of friction acting on the block?
a.
2.0 N
b.
1.4 N
c.
1.6 N
d.
2.8 N
e.
3.4 N