In a parallel RLC circuit, where IR = IR, max sin(?t), the current through the capacitor, IC, is
a. IC = ?IC, max sin(?t).
b. IC = IC, max sin(?t).
c. IC = ?IC, max cos(?t).
d. IC = IC, max cos(?t).
e. IC = IC, max tan(?t).
d
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Substance A has twice the specific “heat” as substance B. Suppose we put 100-g blocks of these substances in direct sunlight. Assume both blocks are black and present the same surface area to the incoming sunlight. After a certain period of time, how are the temperature changes ?TA and ?TB of these blocks related (assuming they lose little heat to their surroundings)?
A. ?TA ? 2?TB B. ?TA ? ?TB, as both receive the same amount of energy C. ?TB ? 2 ?TA D. ?TA = ?TB = 0, because neither receives any heat
A 6.0 kg box slides down an inclined plane that makes an angle of 39° with the horizontal. If the coefficient of kinetic friction is 0.19, at what rate does the box accelerate down the slope?
A) 4.7 m/s2 B) 5.2 m/s2 C) 5.5 m/s2 D) 6.2 m/s2
Two experiments are performed. In (A), an 18.0 N force pushes horizontally on a 2.00 kg block that then pushes on a 4.00 kg block. In (B), an 18.0 N force pushes on a 4.00 kg block that then pushes on a 2.00 kg block. Which statement is correct?
a. The acceleration is 3.00 m/s2 in both (A) and (B). b. The acceleration is 4.50 m/s2 in both (A) and (B). c. The acceleration is 6.00 m/s2 in both (A) and (B). d. The acceleration is 9.00 m/s2 in both (A) and (B). e. The 2.00 kg block has a 9.00 m/s2 acceleration. The 4.00 kg block has a 4.50 m/s2 acceleration.
Discuss the source of energy for a star like the Sun when it is on the Main Sequence. Include the role of nuclear, electrical, and gravitational forces, temperature, and chemical composition
How long can this star burn its fuel and what marks the end of this stage of its life?