Buoyant force is greater on a submerged 10-newton block of
A) lead.
B) aluminum.
C) same on each
Answer: B
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When a current I1 = 1.3 A passes through a wire of cross-sectional area A1 = 5 mm2 the drift velocity of the charge carriers is v1 = 2.7 × 10-5 m/s
What is the drift velocity of the charges when a current I2 = 0.5 A passes through a wire, made of the same material of cross-sectional area A2 = 3 mm2? A) 8.4 × 10-5 m/s B) 6.4 × 10-5 m/s C) 1.7 × 10-5 m/s D) 3.2 × 10-5 m/s E) 2.1 × 10-5 m/s
An amount $100 is deposited in a bank at a fixed annual interest rate compounded annually. At the end of a 2 year period the amount of money has doubled. About what was the annual interest rate?
a. 10% b. 41% c. 50% d. 100% e. 200%
Kepler was finally able to absolutely prove the truth of his theory of the motion of the planets by using
A) the data of Tycho Brahe. B) his own highly accurate observations of the planets. C) data gathered by the ancient Greeks. D) All of the above. E) Nonsense--it is impossible to prove that a theory is true.
A 24-kW electric furnace is connected to a 240-V line. What is the resistance of the furnace?
A) 1000 ? B) 10 ? C) 2.4 ? D) 0.42 ? E) 100 ?