Fundamental Forces: The ?0 meson has a mass of 264 times that of an electron. What is the approximate range of the force mediated by this particle? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 1.5 × 10-10 m
B. 1.5 × 10-12 m
C. 1.5 × 10-14 m
D. 1.5 × 10-15 m
Answer: D
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A. Yes. B. Yes, but only for certain values of A and B. C. Yes, but only if A and B are complex. D. Yes, if B is zero. E. No.
A conducting rod (length = 80 cm) rotates at a constant angular rate of 15 revolutions per second about a pivot at one end. A uniform field (B = 60 mT) is directed perpendicularly to the plane of rotation. What is the magnitude of the emf induced between the ends of the rod?
A. 2.7 V B. 2.1 V C. 2.4 V D. 1.8 V E. 3.3 V
I wish to use a positively charged rod to charge a ball by induction. Which statement is correct?
a. The ball is charged as the area of contact between the two increases. b. The ball must be a conductor. c. The ball must be an insulator that is connected temporarily to the ground. d. The charge on the ball will be positive.
An object at 27°C has its temperature increased to 47°C. The power then radiated by this object increases by how many percent?
a. 3.3 c. 29 b. 14 d. 253