Power: A 100-W light bulb is operated by a 110-V dc source. What is the resistance of this bulb?
A. 100 ?
B. 8.0 × 10-3 ?
C. 6.0 × 10-3 ?
D. 120 ?
E. 240 ?
Answer: D
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A boulder falls off a cliff toward the ground with no air resistance. The isolated system for which momentum is conserved is
1.only the Earth. 2.only the boulder. 3.both the Earth and the boulder. 4.none of these.
A Muon is
A. a Baryon. B. a Lepton. C. a Hadron. D. a Proton.
Charge in an Electric Field: An electron is projected with an initial velocity v0 = 8.4 × 107 m/s along the y-axis, which is the centerline between a pair of charged plates, as shown in the figure. The plates are 1.0 m long and are separated by 0.10 m. A uniform electric field of magnitude E in the +x-direction is present between the plates. If the magnitude of the acceleration of the electron is measured to be 8.9 × 1015 m/s2, what is the magnitude of the electric field between the plates? (e = 1.6 × 10-19 C, melectron = 9.11 × 10-31 kg) 
A. 51,000 N/C B. 45,000 N/C C. 40,000 N/C D. 35,000 N/C E. 29,000 N/C
How is the presence of space debris accounted for by solar system models?
a. Space debris is left over material from the early solar system that never formed into a planet. b. Space debris was formed by the collision of objects after the planets formed. c. Space debris is material that existed in our region of space before the sun formed. d. Both a and b e. All of the above