Which of the following planets in our solar system can we see occasionally transit across the face of the Sun?
A) Mercury only
B) Mercury and Venus
C) Mercury, Venus, and Mars
D) Mars, Jupiter, and Saturn
E) all of the planets
A) Mercury only
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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?
Suppose that inflation did not occur. In that case, the fact that the cosmic microwave background has the same temperature in opposite directions of the sky would be considered
A) surprising, because those locations would never have been close enough to have any light or matter exchanged between them. B) surprising, because we would not expect those locations to have the same age. C) natural, because everything in the universe is naturally expected to have the same temperature. D) natural, because quantum fluctuations in the early universe would have ensured that the whole universe had precisely the same temperature.
We look toward a cool star. How can we determine that there is an interstellar dust cloud between us and the star?
What will be an ideal response?
Exhibit 5-2
A 4.00-kg block is suspended from the roof of an elevator. A 2.00-kg block is suspended from the 4.00-kg block. The tensions in strings 1 and 2 are labeled 
and 
.
?
?
Use this exhibit to answer the following question(s).
Refer to . When the elevator accelerates upwards with an acceleration of 2.20 m/s2, the magnitudes of 
and 
are
A. 30.4 N; 15.2 N.
B. 39.2 N; 19.6 N.
C. 45.6 N; 15.2 N.
D. 48.0 N; 24.0 N.
E. 72.0 N; 24.0 N.