Two nuclei may have equal Z, but different A, because they contain
a. equal numbers of protons and neutrons.
b. equal numbers of protons but different numbers of neutrons.
c. different numbers of protons but equal numbers of neutrons.
d. different numbers of protons and neutrons.
e. electrons as well as neutrons.
B
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A beam of electrons moves at velocity 
. The number of particles per unit volume in the beam of area A is ?. If we imagine a cylindrical Gaussian surface of radius r and length 
centered on the beam, the electron flux through the surface is
A.
B.
C.
D.
).E.
).A 1.0-?F and a 2.0-?F capacitor are connected in series across a 3.0-V voltage source. (a) What is the charge on the 1.0-?F capacitor? (b) What is the voltage across the 2.0-?F capacitor?
What will be an ideal response?
The angle of rotation between the ends of a nylon bar is 3.58. The bar diameter is 70 mm and the allowable shear strain is 0.014 rad. The minimum permissible length of the bar is approximately:
(A) 0.15 m
(B) 0.27 m
(C) 0.40 m
(D) 0.55 m
Suppose you live on the Moon. How long is a day (i.e. from sunrise to sunrise)?
24 hours a lunar month 23 hours 56 minutes a year