Suppose we imagine the Sun to be about the size of a grapefruit (about 10 cm across). Which of the following describes the size and distance of Earth on the same scale?
A) Earth is the size of a marble about 25 miles away from the Sun.
B) Earth is the size of a golf ball about 1 meter away from the Sun.
C) Earth is the size of a point about 1 meter away from the Sun.
D) Earth is the size of a point about 15 meters away from the Sun.
E) Earth is the size of a golf ball about 15 meters away from the Sun.
D
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Nuclear Binding Energy: The neutral helium atom, 
He, has a mass of 4.002603 u, a neutron has a mass of 1.008665 u, a proton has a mass of 1.007277 u, and a neutral hydrogen atom has a mass of 1.007825 u. What is the binding energy of the 
He nucleus? (1 u = 931.5 MeV/c2)
A. 20.5 MeV B. 22.4 MeV C. 27.3 MeV D. 28.3 MeV E. 23.4 MeV
None of the other stars yet studied has more than one planet orbiting it
Indicate whether the statement is true or false
Which one of the following choices is not a possible way to produce a magnetic field?
a) Set up a current in a long, straight wire. b) Uniformly distribute charges over the surface of a conductor. c) Make an object out of materials that have an intrinsic magnetic field. d) Pass a current through a coil of wire.
What is the equivalent capacitance between points a and b? All capacitors are 5.0 ?F
a.
2.6 µF
b.
0.19 µF
c.
3.0 µF
d.
0.33 µF
e.
?0.13 µF