If all the asteroids were gathered into a single object, it would make an object
A) about the size of Earth's moon.
B) about the size of the Earth.
C) about half the diameter of Earth's moon.
D) with enough mass to gather hydrogen and helium and become a gas giant.
C
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A baseball is thrown vertically upward and feels no air resistance. As it is rising
A) both its momentum and its mechanical energy are conserved. B) its momentum is not conserved, but its mechanical energy is conserved. C) both its momentum and its kinetic energy are conserved. D) its kinetic energy is conserved, but its momentum is not conserved. E) its gravitational potential energy is not conserved, buts its momentum is conserved.
Two charged particles near each other are released. As they move, the force on each particle increases. Therefore, the particles have
A) the same sign. B) the opposite sign. C) not enough information
Answer the following statement(s) true (T) or false (F)
1. A particle’s Newtonian x-momentum 
is always either equal to or smaller than the x component of the particle’s four-momentum px
2. A particle’s mass is always either equal to or smaller than the time-component of its four-momentum
3. The absolute value of the x component of a particle’s four-momentum vector is always either equal to or smaller than its t component
4. The squared magnitude of a four-vector could be negative.
5. The squared magnitude of a particle’s four-momentum could be negative.
A thin film of soapy water, n = 1.37, is held vertical. Light of wavelength 600 nm is reflected from the film and horizontal dark lines appear. What is the difference in thickness of the soap film from one band to the next?
A. 600 nm B. 438 nm C. 300 nm D. 219 nm E. 900 nm