We cannot see a new moon in our sky because
A) it is obscured by Earth's shadow.
B) no sunlight is illuminating the Moon.
C) a new moon is quite near the Sun in the sky.
D) it is above the horizon during the daytime.
C
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An automobile is moving on a highway at 100 km/hr. Estimate the heat loss per unit area from the auto’s roof, which is at 30ºC, if the air temperature is 15ºC.
What will be an ideal response?
What causes the bubbling pattern of granulation that we see in the Sun's photosphere?
A) underlying convection B) sunspots C) dark areas of the pattern have larger concentrations of carbon D) dust particles E) magnetic fields
Which of the following correctly describes the situation when Jackie returns to Earth? (Ages in this problem refer to biological ages—that is, how much time has passed for each sister since she was born.)
A) It's the year 2050, and both twin sisters are 70 years old. B) It's the year 2050. Gwen (who stayed home) is 70 years old, but Jackie is only a little older than her age of 20 when she left. C) It's the year 2050. Gwen is 70 years old. Jackie is 19. D) It's the year 2100. Gwen and Jackie are both 120 years old. E) According to Gwen, Jackie returns to Earth in the year 2050, but according to Jackie, she returns in the year 2001.
Suppose you hear a car approaching and its horn is heard as a 3037. Hz tone. After passing, you hear 2430. Hz
(a) What was the Mach number of the car? (b) What is the speed of sound if the outside temperature is 19.°C? (c) How fast was the car moving, in meters per second?