A charged particle is observed traveling in a circular path in a uniform magnetic field. If the particle had been traveling twice as fast, the radius of the circular path would be
A) twice the original radius.
B) four times the original radius.
C) 1/ times the original radius.
D) one-half the original radius.
E) one-fourth the original radius.
A
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Energy and Momentum: An 8.0-g bullet is suddenly shot into a 4.0-kg block that is at rest on a frictionless horizontal surface, as shown in the figure. The bullet remains lodged in the block. The block then moves against a spring and compresses it by 3.7 cm. The force constant (spring constant) of the spring is 2500 N/m. What was the initial speed v of the bullet?
A. 460 m/s B. 440 m/s C. 480 m/s D. 500 m/s E. 520 m/s
What feature(s) of this spectrum indicate(s) that Mars appears red in color?
A) the wavelength of the peak labeled 3 B) the wavelength of the peak labeled 6 C) the fact that the intensity of region 4 is higher than that of region 2 D) the fact that the peak labeled 3 is higher than the peak labeled 6
When two or more resistors are connected in parallel to a battery,
A) the voltage across each resistor is the same. B) the total current flowing from the battery equals the sum of the currents flowing through each resistor. C) the equivalent resistance of the combination is less than the resistance of any one of the resistors. D) all of the given answers E) none of the given answers
A class of pollutants formed at high temperatures (nearly complete combustion) in the presence of air is ______________
Fill in the blank(s) with correct word