The rule for the interaction of magnetic poles is similar to the rule for electric
A) circuits.
B) polarization.
C) charges.
Answer: C
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A block holding a ringing tuning fork oscillates back and forth, attached to a wall by a spring of spring on a horizontal, frictionless surface, with amplitude 17 cm. The mass of the tuning fork and block together is 0.75 kg. An observer who is situated so that the block’s direction of motion is either directly towards or away from him notes that the frequency he hears varies between 174 and 178 Hz. What is the spring constant for the spring ? The speed of sound at the time of the experiment is 340 m/s.
A. 390 N/m B. 203 N/m C. 1590 N/m D. 290 N/m E. 100 N/m
A metal blade (length = 80 cm) spins at a constant rate of 10 radians/s about a pivot at one end. A uniform magnetic field of 2.0 mT is directed at an angle of 30° with the plane of the rotation. What is the magnitude of the potential difference between the two ends of the blade?
A. 5.5 mV B. 6.4 mV C. 3.2 mV D. 11 mV E. 13 mV
A 3. kg ball of putty moving at 1 m/s collides and sticks to a 2 kg ball initially at rest. The putty and ball then move with a momentum of
A) 1 N-s. B) 2 N-s. C) 4 N-s. D) 3 N-s. E) 0 N-s.
How many decibels correspond to a sound intensity of 7.0 × 10-7 W/m2?
A) 70 B) 58 C) 69 D) 75 E) 63