A long steel beam has a length of fifty meters on a cold day when the temperature is 0°C. What is the length of the beam on a hot day when T = 40°C? (asteel= 1.1 × 10^-5/°C)
a. 50.044 m
c. 50.088 m
b. 50.022 m
d. 50.0044 m
B
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Which of the following materials would you predict to be ductile at 50 K?
(a) Pure BCC iron (b) Pure FCC copper (c) Pure HCP titanium (d) PE
Mary and Debra stand on a snow-covered roof. They both throw snowballs with the same initial speed, but in different directions. Mary throws her snowball downward, at 30° below the horizontal; Debra throws her snowball upward, at 30° above the horizontal. Which of the following statements are true about just as the snowballs reach the ground below?
A. Debra's snowball will have a higher speed than Mary's snowball. B. Mary's snowball will have a higher speed than Debra's snowball. C. Both snowballs will hit the ground with the same speed. D. Both snowballs hit the ground at the same time. E. Mary's snowball reaches the ground before Debra's snowball.
Buoyancy: A cubical block of stone is lowered at a steady rate into the ocean by a crane, always keeping the top and bottom faces horizontal. Which one of the following graphs best describes the buoyant force B on this block as a function of time t if the block just enters the water at time t = 0 s?
A. 
B. 
C. 
D. 
E. 
All gamma-ray bursters have the same fundamental driving mechanism, although we don't yet know whether it is a hypernova or a merger of two neutrons stars
Indicate whether the statement is true or false