Assuming the encounter hypothesis is correct and planets can only form from the gravitational interactions between passing stars, what implications does this have for the possibility of life elsewhere in the universe?
A) there would be no possibility of life at all because close stellar encounters never occur
B) life would be exceedingly rare because close stellar encounters are exceedingly rare
C) we have no way to determine the probability of close stellar encounters so we have no way of knowing
D) life would be very common because stellar close encounters are constantly occurring
B
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A laboratory apparatus is used to maintain a horizontal slab of ice at -2.2°C so that specimens can be prepared on the surface of the ice and kept close to 0°C. If the ice is 10 cm by 3.8 cm and the laboratory is kept at 16°C, find the cooling rate in watts that the apparatus must provide to the ice.
GIVEN
• A slab of ice in a laboratory
• Ice temperature (Ti) = -2.2°C
• Ice dimensions: 10 cm by 3.8 cm
• Ambient temperature (T?) = 16°C
FIND
• The cooling rate (q) in watts
ASSUMPTIONS
• Air in the laboratory is still
• Effects of sublimation are negligible
• Effects of moisture in the air are negligible
SKETCH
PROPERTIES AND CONSTANTS
for dry air at the mean temperature of 6.9°C
Thermal expansion coefficient (?) = 0.0036 1/K
Thermal conductivity (k) = 0.0242 W/(m K)
Kinematic viscosity (?) = 14.51*10-6 m2/s
Prandtl number (Pr) = 0.71
According to Wien's law, a hotter object will ________ a cooler object.
A. appear darker than B. radiate the same intensity of wavelengths as C. appear the same color as D. radiate more strongly at shorter wavelengths than
Which of the following statements is correct?
a. For a nearsighted person, the near point is always located closer than 25 cm from the eye and the corrective lens is diverging. b. For a nearsighted person, the near point is always located closer than infinity from the eye and the corrective lens is converging. c. For a farsighted person, the near point is always located farther than 1 m from the eye and the corrective lens is diverging. d. For a farsighted person, the near point is always located farther than 25 cm from the eye and the corrective lens is converging.
What, approximately, are the dimensions of the smallest object on Earth that the astronauts can resolve by eye at 200 km height from the space shuttle? Assume ? = 500 nm light and a pupil diameter D = 0.50 cm. Assume eye fluid has an average n = 1.33
a. 150 m b. 100 m c. 250 m d. 25 m e. 18 m