The amount of time between successive passes of any given star across the meridian is
A) 23 hours 56 minutes.
B) 24 hours.
C) 365.25 days.
D) 12 years.
E) 26,000 years.
A
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On planet X, the absolute pressure at a depth of 2.00 m below the surface of a liquid nitrogen lake is 5.00 × 105 N/m2. At a depth 5.00 m below the surface, the absolute pressure is 8.00 × 105 N/m2. The density of liquid nitrogen is 808 kg/m3
(a) What is the atmospheric pressure on planet X? (b) What is the acceleration due to gravity on planet X? What will be an ideal response?
One mole of an ideal gas has a temperature of 25°C. If the volume is held constant and the pressure is doubled, the final temperature (in °C) will be
a. 174 b. 596 c. 50 d. 323 e. 25
Determine the ratio of the total hemispherical emissivity to the normal emissivity for a nondiffuse surface if the intensity of emission varies as the cosine of the angle measured from the normal.
GIVEN
• A nondiffuse surface
• Intensity of emission varies as the cosine of the angle measured from normal
FIND
• The ratio of the total hemispherical emissivity (?) to the normal emissivity (?n)
SKETCH
A 35-mm digital camera using a standard 50.0 mm lens is focused on a 1.80 m tall person who is standing 3.25 m from the lens
You now refocus the camera on a 15.0 cm tall flower that is 75.0 cm from the lens. (a) In refocusing, by how much did you move the lens? Did you move it toward the film or away from it? (b) What is the height of the flower's image on the CCD sensor?