Methane absorbs blue photons better than red and scatters red photons better than blue, giving Neptune a green color and Uranus a blue color
Indicate whether the statement is true or false
False
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In the summer in the northern hemisphere,
a. the Earth is closer to the Sun. b. the Earth's northern hemisphere is tilted toward the Sun. c. the Earth's northern hemisphere is tilted away from the Sun.
A large slab of steel 0.1-m-thick contains a 0.1-m-diameter circular hole, whose axis is normal to the surface. Considering the sides of the hole to be black, specify the rate of radiative heat loss from the hole. The plate is at 811 K, the surroundings are at 300 K.
GIVEN
• A large slab of steel with a hole whose axis is normal to the surface
• Slab thickness (S) = 0.1 m
• Hole diameter (D) = 0.1 m
• Plate temperature (T1) = 811 K
• Temperature of surrounding (T?) = 300 K
FIND
• The rate of radiative heat loss from the hole (qr)
ASSUMPTIONS
• The sides of the hole are black
SKETCH
PROPERTIES AND CONSTANTS
the Stephan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
In an MRI medical imaging apparatus, the patient is subject to what kind of "radiation"?
A) gamma rays B) X-rays C) radio D) alpha radiation E) beta rays
A 50 kg uniform ladder, 5.0 m long, is placed against a smooth wall at a height of h = 3.7 m. The base of the ladder rests on a rough horizontal surface whose coefficient of static friction is 0.40
An 80 kg block is suspended from the top rung of the ladder, just at the wall. In Figure 10.12, the magnitude of the force exerted on the base of the ladder, due to contact with the rough horizontal surface is closest to: A) 1,580 B) 1,560 C) 1,550 D) 1,600 E) 1,610