Which two circuits are exactly equivalent?
A. A and B
B. B and C
C. C and D
D. D and E
E. B and E
Answer: E
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Gamma ray bursts are ____
a. too weak to affect life on Earth b. an important influence on mutation and evolution c. the cause of the spectacular auroras at high latitudes d. triggers for solar flares and coronal mass ejections e. capable of causing mass extinction events
The figure shows two 1.0 kg-blocks connected by a rope. A second rope hangs beneath the lower block. Both ropes have a mass of 250 g. The entire assembly is accelerated upward at 2.3 m/s2 by force . What is the tension at the top end of rope 1?
A) 18 N B) 15 N C) 2.9 N D) 3.5 N
An AC series circuit contains a resistor of 20 W, an inductor of 50 mH, and a variable capacitor. If the frequency of the applied voltage is 500 Hz, to what setting should the capacitor be set if resonance is achieved?
a. 2.4 µF c. 2.0 µF b. 3.4 µF d. 0.8 µF
Specific heat capacity of ice = 2,000 J/kg-°C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-°C A 1 kg block of ice is removed from a freezer where its temperature was –10°C. The amount of heat absorbed by the ice as it warms to 0°C is
a. 2,000 J b. 4,000 J c. 20,000 J d. 40,000 J e. 334,000 J