Given the equations below, which description best fits the physical situation?
?
?
A. A projectile's displacement two seconds after being fired upward with a speed of 30.0 m/s.
B. A projectile's displacement two seconds after being fired upward with a speed of 40.0 m/s.
C. A projectile's displacement two seconds after being fired upward with a speed of 50.0 m/s.
D. A projectile's displacement two seconds after being fired upward with a speed of 60.0 m/s.
E. A projectile's displacement two seconds after being fired upward with a speed of 80.0 m/s.
Answer: B
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When was it first known that Earth was spherical in shape?
A. It was always known to be spherical. B. only after Galileo used a telescope to study other planets C. at the beginning of the Renaissance D. at the time of the Greeks E. only recently within the last hundred years
Consider two parallel wires carrying current in opposite directions. Which one of the following statements to true concerning this situation?
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How does a particle’s relativistic kinetic energy K compare to its Newtonian kinetic energy when the particle’s speed 
?
A. 
B. 
C.
An interpretation of the photoelectric effect is that:
1.Light is emitted only when electrons change orbits. 2.Light has a wavelike character. 3.Light is absorbed in quanta of energy E = h? 4.Electrons have an associated wave having wavelength ? = h/p. 5.Photons must have some minimum energy to penetrate a material. 6.More than one of the above