Suppose one observes cosmic rays creating a new particle high in the atmosphere and the particle moves at 99.7% the speed of light. It is observed to decay in an average 37.0 ?s. What is the proper lifetime of the particle?
A) 2.86 ?s
B) 4.33 ?s
C) 18.1 ?s
D) 12.4 ?s
E) 5.33 ms
A
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Angular and Linear Quantities: A wheel of diameter 0.70 m rolls on the floor without slipping. A point at the top of the wheel moves with a speed 2.0 m/s relative to the floor.(a) At what speed is the central axis of the wheel moving relative to the floor?(b) What is the angular speed of the wheel?
What will be an ideal response?
Two taut strings of identical mass and length are stretched with their ends fixed, but the tension in one string is 1.10 times greater than in the other. Waves on the string with the lower tension propagate at 35.2 m/s
The fundamental frequency of that string is 258 Hz. What is the beat frequency when each string is vibrating at its fundamental frequency? A) 12.6 Hz B) 9.00 Hz C) 11.0 Hz D) 17.1 Hz E) 13.7 Hz
If the rms value of the electric field is 9.0 V/m at a distance of 6.0 m from an isotropic source, what is the rms value of the magnetic field at a distance of 12 m from the source?
a. 
b. 
c. 
d. 
e. 
An atom has more protons than electrons. The atom is
A) a negative ion. B) a positive ion. C) an insulator. D) a conductor. E) a semiconductor.