Most of the world's sand is made up of which two minerals?
What will be an ideal response?
Answer: Feldspar, the most common and abundant mineral, and quartz, the second most common mineral, make up most of the world's sand deposits.
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Series/Parallel Circuits: 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.
Determine the net force (Fnet) on an object that experiences the following four forces:
40 N downward gravity 30 N upward normal force 20 N rightward app. force 20 N leftward friction force A. 0 N B. 10 N C. 50 N D. 100 N
A circuit consists of three identical lamps connected to a battery as in Figure OQ28.14. The battery has some internal resistance. The switch S, originally open, is closed. What happens to the current in the battery?
A railroad train travels forward along a straight track at 80.0 m/s for 1000 m and then travels at 40.0 m/s for the next 1000 m. What is the average velocity?
a. 60.0 m/s c. 63.7 m/s b. 37.5 m/s d. 53.3 m/s