A conical pendulum is constructed with a string 2.5 m in length. The pendulum is set in horizontal circular path about the vertical axis. If the angular velocity of the conical pendulum is a constant 2.8 rad/s, then the angle the string makes with the vertical axis is
A. 48 degrees.
B. 60 degrees.
C. 71 degrees.
D. 75 degrees.
E. 80 degrees.
B. 60 degrees.
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A 4.00-liter container is divided into two equal parts, one part containing 0.0100 mole of neon, and the other part containing 0.0100 mole of helium. The divider is removed and the gases mix. What is the change in entropy (in J/K) of this system?
A. 0.0576 B. 0.115 C. 0.173 D. 0.0864 E. 0.144
Where did the cosmic microwave background (CMB) come from?
a. Photons emitted from the first stars b. Photons released from hydrogen in our galaxy c. Light scattered by dust in our Solar System d. Photons released when electrons and nuclei combined for the first time.
A car traveling 85 km h slows down at a constant 0.50 m/s2 just by “letting up on the gas.” Calculate
(a) the distance the car coasts before it stops, (b) the time it takes to stop, (c) the distance it travels during the first and fifth seconds.
In a series circuit containing a resistor and an inductor connected to an ideal dc source and a switch, the inductor gets 40% of its maximum current 1.8 s after the switch is closed. What is the time constant of this circuit?
A) 2.5 s B) 0.80 s C) 5.5 s D) 3.5 s E) 1.5 s