The vertical displacement of a string is given by y(x,t) = (6.00 mm) cos[(3.25 m-1)x - (7.22 s-1)t]. What is the speed of the wave?
A)
0.450 m/s
B)
1.41 m/s
C)
2.22 m/s
D)
3.16 m/s
E)
23.5 m/s
C
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?Suppose a particle is moving along a straight line with a speed v for a time t, then stops for a time t, and then resumes moving along the original direction with speed v for time t. What has been the average speed of the particle for the total time period 3t?
A) v
B) 
C) 1.5v
D) 
Nuclear Binding Energy: A beryllium-8 nucleus at rest undergoes double alpha decay as follows:
The known atomic masses are:
What is the kinetic energy of each departing alpha particle? (1 u = 931.5 MeV/c2)
A. 46 keV B. 65 keV C. 92 keV D. 130 keV E. 180 keV
Which portion(s) of the spectrum represent(s) reflected sunlight?
A) 1 only B) 2, 3, and 4 C) 3 and 6 D) the entire spectrum
Europa, a satellite of Jupiter, has an orbital diameter of 1.34 × 109 m and a period of 3.55 days. What is the mass of Jupiter? (G = 6.67 × 10-11 N ? m2/kg2 )
A) 1.53 × 1027 kg B) 1.65 × 1027 kg C) 1.07 × 1027 kg D) 1.89 × 1027 kg E) 3.08 × 1027 kg