The place from which motion is observed and measured is called
A) a frame of reference.
B) a starting point.
C) an initial location.
Answer: A
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Force on a Moving Charge: Three particles travel through a region of space where the magnetic field is out of the page, as shown in the figure. What are the signs of the charges of these three particles?
A. 1 is neutral, 2 is negative, and 3 is positive. B. 1 is neutral, 2 is positive, and 3 is negative. C. 1 is positive, 2 is neutral, and 3 is negative. D. 1 is positive, 2 is negative, and 3 is neutral. E. 1 is negative, 2 is neutral, and 3 is positive.
A ventilation fan has blades 0.25 m in radius rotating at 30 rpm. What is the tangential speed of each blade tip?
a. 0.02 m/s c. 0.79 m/s b. 0.52 m/s d. 20 m/s
Dispersion occurs when:
a. some materials bend light more than other materials. b. a material slows down some wavelengths more than others. c. a material changes some frequencies more than others. d. light has different speeds in different materials.
A person weighing 900 N is standing on snowshoes. Each snowshoe has area 2500 cm2 and has negligible weight. What pressure does this person's weight exert on the snow?
A) 0.18 N/m2 B) 0.36 N/m2 C) 1800 N/m2 D) 3600 N/m2