All the following statements are true. Which one explains why convection can occur in the troposphere but not in the stratosphere?
A) Atmospheric pressure is much greater in the troposphere than in the stratosphere.
B) The stratosphere contains significant amounts of ozone but the troposphere does not.
C) Temperature declines with altitude in the troposphere but increases with altitude in the stratosphere.
D) Clouds tend to form in the troposphere but not the stratosphere.
C
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A thin-walled cylindrical tank with a diameter of 200 mm has an internal pressure of 11 MPa. The yield stress in tension is 250 MPa, the yield stress in shear is 140 MPa, and the factor of safety is 2.5. The mini-mum permissible thickness of the tank is approximately:
(A) 8.2 mm (B) 9.1 mm (C) 9.8 mm (D) 11.0 mm
When the reflection of an object is seen in a convex mirror the image will:
a. may be either real or virtual. c. always be virtual. b. will always be enlarged. d. always be real.
This is the H-R diagram for stars in a 12-billion-year-old globular cluster. Based on our understanding of stellar lives, which of the four labeled stars is currently generating energy through hydrogen fusion in a shell around an inert (nonfusing) helium core?
A) I B) II C) III D) IV
Which planet (besides Earth) has been visited by the largest number of robotic spacecraft?
A) Mars B) Venus C) Jupiter D) Saturn