A piece of copper of mass 100 g is being drilled through with a 1/2" electric drill. The drill operates at 50.0 W and takes 30.0 s to bore through the copper. If all the energy from the drill heats the copper, find the copper's increase in temperature. (ccopper = 387 J/kg • °C.)
a. 40.6°C
c. 31.0°C
b. 38.8°C
d. 27.3°C
B
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A horizontal uniform meter stick supported at the 50-cm mark has a mass of 0.50 kg hanging from it at the 20-cm mark and a 0.30 kg mass hanging from it at the 60-cm mark. Determine the position on the meter stick at which one would hang a third mass of 0.60 kg to keep the meter stick balanced
a. 74 cm b. 70 cm c. 65 cm d. 86 cm e. 62 cm
If a surface has a work function of 1.5 eV and photons of energy 2.7 eV are shone on the surface, what is a possible kinetic energy of the electrons emitted from the surface?
A) 3.0 eV B) 2.0 eV C) 4.0 eV D) 1.0 eV E) No electrons are emitted.
If you see a rainbow near the time of sunset, where in the sky will the rainbow be?
a. overhead b. toward the eastern horizon c. toward the western horizon d. toward the northern horizon e. toward the southern horizon
Instructions: On occasion, the notation 
will be a shorthand notation for 
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A student decides to spend spring break by driving 50 miles due east, then 50 miles 30 degrees south of east, then 50 miles 30 degrees south of that direction, and to continue to drive 50 miles deviating by 30 degrees each time until he returns to his original position. How far will he drive, and how many vectors must he sum to calculate his displacement? A. 0, 0 B. 0, 8 C. 0, 12 D. 400 mi, 8 E. 600 mi, 12