A car travels at 15 m/s for 10 s. It then speeds up with a constant acceleration of 2.0 m/s2 for 15 s. At the end of this time, what is its velocity?
A) 15 m/s
B) 30 m/s
C) 45 m/s
D) 375 m/s
C
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Vision Problems: A nearsighted man wears contact lenses of -3.00 diopters. With these lenses, his corrected near point is 25.0 cm. What is his uncorrected near point?
Fill in the blank(s) with the appropriate word(s).
Which radiation has no association with electric charge?
A) alpha B) beta C) gamma D) all of the above E) none of the above
A nonconducting sphere of radius 10 cm is charged uniformly with a density of 100 nC/m3 . What is the magnitude of the potential difference between the center and a point 4.0 cm away?
a. 12 V b. 6.8 V c. 3.0 V d. 4.7 V e. 2.2 V
What are the two parts of a typical X-ray spectrum?
a. The electron stream and the proton stream. b. Part A and Part B. c. A continuous spectrum caused by slowing electrons and a set of discrete spikes from atomic emissions. d. A continuous spectrum from atomic emission and a set of discrete spikes from slowing electrons. e. A quantized spectrum of atomic energy and a continuous spectrum of photoelectric energy.