You are on the surface of an object, and you have a fairly clear view out into space. Unfortunately, you are also very squashed. The light you observe from distant objects is slightly blueshifted
The surface of the object is composed primarily of carbon and oxygen, and the distance to the horizon seems about the same as that on Earth. By observing the sky for a few weeks, you realize that there are several planets orbiting your object. Where are you?
A) You are on the surface of a neutron star.
B) You are on the surface of the Earth.
C) You are on the surface of a planet that is somewhat more massive than the Earth.
D) You are on the surface of a white dwarf.
E) You are "on" an accretion disk around a black hole.
D
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Size of the Nucleus: Estimate the radius (in fm) of a radon nucleus that contains 86 protons and 136 neutrons.
Fill in the blank(s) with the appropriate word(s).
According to Newton's Law of Universal Gravitation, if the Moon were three times further from Earth, the force by Earth on the Moon would
A) increase by a factor of 3. B) decrease by a factor of 3. C) increase by a factor of 9. D) decrease by a factor of 9. E) stay the same.
A 4.0-?C charge is situated at the origin of an xy-coordinate system. What is the potential difference between a point x = 4.0 m and y = -4.0 m because of this charge?
A) 18 × 103 V B) -18 × 103 V C) 0 V D) 36 × 103 V E) -36 × 103 V
A 4.0-cm tall apple is 20 cm in front of a plano-convex lens of focal length 75 cm
(a) Find the location of the image of the apple. Is it a real or a virtual image? (b) How tall is the image of the apple? Is it upright or inverted? What will be an ideal response?