Which of the following increases the internal energy of a solid metal rod?
a. raising it to a greater height
c. having the rod conduct heat
b. throwing it through the air
d. having the rod absorb heat
D
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If low density is the primary design requirement, what class of material discussed in this chapter would you first investigate for suitability?
What will be an ideal response?
Light of wavelength 687 nm is incident on a single slit 0.75 mm wide. At what distance from the slit should a screen be placed if the second dark fringe in the diffraction pattern is to be 1.7 mm from the center of the diffraction pattern?
A) 0.39 m B) 0.47 m C) 0.93 m D) 1.1 m E) 1.9 m
Which of the following has not been detected around other stars in the Galaxy?
A) a collapsing nebula of gas B) flattened, spinning disks C) jovian planets D) asteroids E) strong stellar winds
An automobile (m = 1.00 × 10^3 kg) is driven into a brick wall in a safety test. The bumper behaves like a spring (k = 5.00 × 10^6 N/m), and is observed to compress a distance of 3.16 cm as the car is brought to rest. What was the initial speed of the automobile?