If Earth had no atmosphere, its temperature would be
A) somewhat warmer than the freezing temperature of water.
B) somewhat below the freezing temperature of water.
C) extremely hot, about 50 degrees Celsius.
D) well below freezing, about -50 degrees Celsius.
E) about the same temperature it is now.
B
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A light ray strikes a hexagonal ice crystal floating in the air at a 30° angle to one face, as shown below. The hexagonal faces of the crystal are perpendicular to the plane of the page. All the rays shown are in the plane of the page, and nice = 1.30. Which outgoing ray is the correct one?
a.
A
b.
B
c.
C
d.
D
e.
E
Newton's Second Law in 1 Dimension: A flatbed truck is carrying an 800-kg load of timber that is not tied down. The maximum friction force between the truck bed and the load is 2400 N. What is the greatest acceleration that the truck can have without losing its load?
Fill in the blank(s) with the appropriate word(s).
A person has a thermal conductivity of 0.18 W/m·K between his inner core and his skin with an effective shell thickness of 1.30 cm between his core and skin. If his inner core is at the normal 98.6°F, and his skin has a surface area of 1.62 m2, what will be his rate of loss of thermal energy due to conduction through his skin if his skin temperature is 28.3°C?
a. 150 W b. 158 W c. 316 W d. 195 W e. 254 W
By what mechanism does solar energy reach the Sun's photosphere from the layer just underneath it?
A) differentiation B) ionization C) radiation D) convection E) conduction