You obtain a 100-W light bulb and a 50-W light bulb. Instead of connecting them in the normal way, you devise a circuit that places them in series across normal household voltage
If each one is an incandescent bulb of fixed resistance, which statement about these bulbs is correct? A) Both bulbs glow with the same brightness, but less than their normal brightness.
B) Both bulbs glow with the same brightness, but more than their normal brightness.
C) The 100-W bulb glows brighter than the 50-W bulb.
D) The 50-W bulb glows more brightly than the 100-W bulb.
D
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Preston pushes a wheelbarrow weighing 480 N to the top of a 45.0-m ramp, inclined at 22.0° with the horizontal, and leaves it. Tamara accidentally bumps the wheelbarrow. It slides back down the ramp, during which an 85.0-N frictional force acts on it over the 45.0 m. What is the wheelbarrow's kinetic energy at the bottom at of the ramp? (g = 9.8 m/s2)
a. 1.4E+3 J b. 1.6E+4 J c. 1.2E+4 J d. 8.1E+3 J e. 4.3E+3 J
In the atmosphere, the shortest wavelength electromagnetic waves are called
a. microwaves. b. infrared waves. c. ultraviolet waves. d. X-rays. e. gamma rays.
How does the thickness of a lens relate to it being converging or diverging?
What will be an ideal response?
According to the present estimates, the Universe is about ________ years old.
A. 14 × 105 B. 14 × 107 C. 14 × 1011 D. 14 × 109