Severe, long-term cooling periods during the Earth's history are known as
A) snowball Earth
B) ice storms
C) ice ages
D) nuclear winters
A
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The primary scientific purpose of a particle accelerator is to
A) make small particles achieve large accelerations. B) produce energy for commercial use. C) create particles and study their behavior. D) make small particles go very fast.
At t = 0 the switch S is closed with the capacitor uncharged. If C = 50 ?F, ? = 20 V, and R = 4.0 k?, what is the charge on the capacitor when I = 2.0 mA?
a.
360 ?C
b.
480 ?C
c.
240 ?C
d.
600 ?C
e.
400 ?C
Consider two charged spheres, one with charge +2 C and the other with -2 C. A proton (a positively charged particle) is at the point halfway between the spheres. What is not zero?
a. the potential energy of the proton b. the work to move the proton from infinity to that point c. the force on the proton d. all of the three above are zero
The expression(s) indicating the number of neutrons in a nucleus is
a. A b. N c. Z d. Z + N e. A – Z