Is the decay ?0 ? ?+ + v? allowed?
A) No, because mass is created.
B) Yes, because it conserves energy.
C) No, because charge is not conserved.
D) No, because lepton number is not conserved.
C
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You are designing an ac generator with a maximum emf of 8.0 V. If the generator coil has 200 turns, each with a cross-sectional area of 0.030 m2,
what should be the frequency of the generator in a magnetic field of 0.030 T? A) 7.5 Hz B) 7.1 Hz C) 44 Hz D) 8.0 Hz
A space probe has a 24.7-m length when measured at rest. What length does an observer at rest measure when the probe is going by at a speed of 0.860c?
a. 25.2 m b. 6.43 m c. 9.19 m d. 12.6 m
An 8 000-kg aluminum flagpole 100-m long is heated by the sun from a temperature of 10°C to 20°C. Find the heat transferred (in J) to the aluminum if the specific heat of aluminum is 0.215 cal/g/°C
a. 7.2 × 10^5 b. 7.2 × 10^7 c. 7.2 × 10^3 d. 7.2 × 10^1 e. 7.2 × 10^2
You observe a rocket moving toward you. Compared to its length when it was at rest on the ground, you will measure its length to be:
1.shorter. 2.longer. 3.the same.