Which of the following statements about the celestial equator is true at all latitudes?
A) It lies along the band of light we call the Milky Way.
B) It represents an extension of Earth's equator onto the celestial sphere.
C) It cuts the dome of your sky exactly in half.
D) It extends from your horizon due east, through your zenith, to your horizon due west.
E) It extends from your horizon due north, through your zenith, to your horizon due south.
B) It represents an extension of Earth's equator onto the celestial sphere.
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General Questions: Bill and his daughter Susan are both standing on identical skateboards (with really good frictionless ball bearings), initially at rest. Bill weighs three times as much as Susan. Bill pushes horizontally on Susan's back, causing Susan to start moving away from Bill. Just after Bill stops pushing,
A. Susan and Bill are moving away from each other, and Susan's speed is three times that of Bill. B. Susan is moving away from Bill, and Bill is stationary. C. Susan and Bill are moving away from each other, with equal speeds. D. Susan and Bill are moving away from each other, and Susan's speed is one-third that of Bill.
A long, half-round cylinder is placed in an air stream with its flat face down-stream. An electrical resistance heater inside the cylinder maintains the cylinder surface temperature at 50°C. The cylinder diameter is 5 cm, the air velocity is 31.8 m/s, and the air temperature is 20°C. Determine the power input of the heater per unit length of cylinder. Neglect radiation heat transfer.
GIVEN
• A long, half-round cylinder in an air stream with its flat surface downstream
• Cylinder surface temperature (Ts) = 50°C
• Cylinder diameter (D) = 5 cm = 0.05 m
• Air velocity (U?) = 31.8 m/s
• Air temperature (T?) = 20°C FIND
• Power input to the heater ( Q G/L)
ASSUMPTIONS
• Steady state
• Radiative heat transfer is negligible
• Flow separates at the cylinder edges as shown below
SKETCH
After a full moon, about how long is it until the next new moon?
A. a week B. 6 hours C. 2 weeks D. a month
The coefficient of the restitution of an object is defined as the ratio of its outgoing to incoming speed when the object collides with a rigid surface
For an object with a coefficient of 0.78, what fraction of the object's kinetic energy is lost during a single collision? A) 47% B) 61% C) 39% D) 16%