Two identical circuits have a capacitor in series with a resistor. In circuit A, the resistor has resistance R, while in circuit B, its resistance is 4R. The capacitors are identical. Each capacitor begins fully charged, and each circuit is open. When each circuit is connected (i.e. the switch in them is closed) the capacitor will fully discharge. If a time t is required for circuit A’s capacitor to fully discharge, what time will be required for circuit B’s capacitor to do the same?
A. 4t
B. 0.5t
C. 0.25t
D. t
E. 2t
C. 0.25t
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In a chiller unit R-123 evaporates at -20ºC in 1-cm-inside-diameter horizontal tubes. The inside surface temperature of the tubes is estimated as 5ºC and film boiling is assumed. Saturated liquid flows in at 20 g/s and is to leave as saturated vapor. Estimate the necessary tube length required. Use hnf = 183.4 kJ/kg and hng = 367.9 kJ/kg for R-123.
What will be an ideal response?
Slanting Surfaces With Friction: A 5.0-kg box slides on the surface on a ramp that rises at 37° above the horizontal. The coefficient of kinetic friction between the box and the surface of the ramp is 0.60. What are the magnitude and direction of the acceleration of the box if it is sliding (a) up the ramp, (b) down the ramp?
What will be an ideal response?
When a comet is in the inner solar system, what part of it points most directly away from the Sun?
A) the denser side of its nucleus B) its coma C) jets of gas emerging from its nucleus D) its tail
The Galactic Year is the time for our solar system to orbit the Galaxy; it is about:
A) 15 million years. B) 225 million years. C) 4.5 billion years. D) 9.6 billion years. E) 13.5 billion years.