Evidence that molecules of a gas are in constant motion is:
A. winds exert pressure
B. two gases interdiffuse quickly
C. warm air rises
D. energy as heat is needed to vaporize a liquid
E. gases are easily compressed
Answer: B. two gases interdiffuse quickly
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The amount of current in a circuit depends on _______.
A. the electrical resistance of the circuit B. the voltage across the circuit C. both of these answers D. neither of these answers
A block of wood has density 0.500 g/cm3 and mass 2 000 g. It floats in a container of oil (the oil's density is 0.750 g/cm3). What volume of oil does the wood displace?
a. 4 000 cm3 b. 2 670 cm3 c. 1 500 cm3 d. 1 000 cm3 e. 500 cm3
When the handle of a tuning fork is held solidly against a table, the time the fork keeps vibrating becomes
A) longer. B) shorter. C) remains the same
A very long wire carries a uniform linear charge density of 7.0 nC/m. What is the electric field strength 16.0 m from the center of the wire at a point on the wire's perpendicular bisector? (?0 = 8.85 × 10-12 C2/N ? m2)
A) 7.9 N/C B) 3.9 N/C C) 0.49 N/C D) 0.031 N/C