A _____ is composed of ionized gas trapped in a magnetic arch rising up through the photosphere and the chromosphere into the lower corona
A) chroma
B) constellation
C) nebula
D) prominence
D
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Which of the following is NOT a Mars rover?
A) Spirit B) Sojourner C) Curiosity D) Viking
A radioactive substance is placed in a sealed container. Three days later, only one-eighth of the sample is still radioactive. What is the half-life of the sample?
A. 4 days B. 2 days C. 1 day D. 12 hrs E. 6 hrs
A charge q = 3 × 10-6 C of mass m = 2 × 10-6 kg, and speed v = 5 × 106 m/s enters a uniform magnetic field. The mass experiences an acceleration a = 3 × 104 m/s2
What is the minimum magnetic field that would produce such an acceleration? A) 0.1 T B) 0.004 T C) 0.001 T D) 0.01 T E) 0.04 T
Potential of Point-Charges: Two 3.0 ?C charges lie on the x-axis, one at the origin and the other at 2.0 m. What is the potential (relative to infinity) due to these charges at a point at 6.0 m on the x-axis? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 11,000 V B. 9000 V C. 14,000 V D. 3400 V