A physicist claims that she has found a new particle with a mass 200 000 times the mass of the proton (1.67 × 10?27 kg) and a charge of 3.20 × 10?19 C. If she is correct, such a particle traveling in a circle in a uniform 5.00 T magnetic field at a velocity of 2 500 m/s will have a radius of
A. 0.261 m.
B. 0.522 m.
C. 1.04 m.
D. 3.27 m.
E. 3.13 × 1026 m.
Answer: B
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A weak acid is added to a concentrated solution of hydrochloric acid. Does the solution become more or less acidic?
A) More acidic, since there are more hydronium ions being added to the solution. B) Less acidic, since the solution becomes more dilute with a less concentrated solution of hydronium ions being added to the solution. C) No change in acidity, since the concentration of the hydrochloric acid is too high to be changed by the weak solution. D) Less acidic since the concentration of hydroxide ions will increase.
When a charged cloud passes overhead, the ground below is charged by
a. induction. b. polarization. c. deduction. d. electrification.
A transformer is to be designed to increase the 30 kV-rms output of a generator to the transmission-line voltage of 345 kV-rms. If the primary winding has 80 turns, how many turns must the secondary have?
a. 6 b. 70 c. 920 d. 9200 e. 12
A uniform rod (length = 2.4 m) of negligible mass has a 1.0-kg point mass attached to one end and a 2.0-kg point mass attached to the other end. The rod is mounted to rotate freely about a horizontal axis that is perpendicular to the rod and that passes through a point 1.0 m from the 2.0-kg mass. The rod is released from rest when it is horizontal. What is the angular velocity of the rod at the
instant the 2.0-kg mass passes through its low point? a. 1.7 rad/s b. 2.2 rad/s c. 2.0 rad/s d. 1.5 rad/s e. 3.1 rad/s