An 8 000-kg aluminum flagpole 100-m long is heated by the sun from a temperature of 10°C to 20°C. Find the work done (in J) by the aluminum if the linear expansion coefficient is 24 × 10^?6 (°C)?1 . (The density of aluminum is 2.7 × 10^3 kg/m3 and 1 atm = 1.0 × 10^5 N/m2.)
a. 287
b. 425
c. 213
d. 710
e. 626
c
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If the light takes 8 minutes to reach Earth from the Sun and the nearest star is 4.7 ly from the Sun, what is the distance from the Sun to the nearest star in astronomical units?
a. 37.6 AU b. 1.7 AU c. 214 AU d. 310,000 AU e. 1.5 × 10^11 AU
Exclusion Principle: Which of the following values can be taken by the electron spin quantum number, ms?
A. ±1/2 B. 0 C. ±1 D. ±2 E. ±3
Suppose we imagine the Sun to be about the size of a grapefruit. Which of the following describes the size and distance of Earth on the same scale?
A) Earth is the size of a tip of a ballpoint pen about 1 meter away from the Sun. B) Earth is the size of a golf ball about 1 meter away from the Sun. C) Earth is the size of a tip of a ballpoint pen about 15 meters away from the Sun. D) Earth is the size of a golf ball about 15 meters away from the Sun. E) Earth is the size of a marble about 25 miles away from the Sun.
The continuous part of an x ray spectrum of an atom occurs because
a. of photon absorption b. of the photoelectric effect c. electrons in the atom make transitions to lower energy levels d. of the uncertainty principle e. of rapid deceleration of the bombarding electrons