A car travels around a curve with constant speed. The correct statement from the following is
A. the car has zero acceleration.
B. the car has an acceleration directed in the instantaneous direction of the velocity vector.
C. the velocity of the car is constant.
D. the car has an acceleration directed inward toward the center of the curve.
E. the car has an acceleration directed outward from the center of the curve.
Answer: D
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Suppose the two plates of a parallel-plate capacitor have fixed charges Q and -Q. If we double the gap between the plates, the (a) potential difference between the plates,
A. quadruples. B. doubles. C. remains the same. D. is reduced by a factor of two. E. is reduced by a factor of four. F. some other result (specify).
Where did the cosmic microwave background (CMB) come from?
a. photons emitted from the first stars b. photons released from hydrogen in our galaxy c. light scattered by dust in our Solar System d. photons released when electrons and nuclei combined for the first time
What is the wavelength of a 6.32-eV photon? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 197 nm B) 167 nm C) 216 nm D) 234 nm
Blue light travels more slowly through glass than red light does
Indicate whether the statement is true or false