The value of a wavelength in the Balmer series is 372.1 nm. What is the value of n?
A) 6
B) 3
C) 9
D) 10
E) 14
E
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Free Fall: A 10-kg rock and a 20-kg rock are dropped at the same time and experience no significant air resistance. If the 10-kg rock falls with acceleration a, what is the acceleration of the 20-kg rock?
A. 4a B. 2a C. a D. a/2 E. a/4
An earthquake generates three kinds of waves: surface waves (L-waves), which are the slowest and weakest, shear (S) waves, which are transverse waves and carry most of the energy, and pressure (P) waves, which are longitudinal waves and are the
fastest. The speed of P waves is approximately 7 km/s, and that of S waves is about 4 km/s. People do not generally feel the P waves, but animals seem to be sensitive to them. If a person reports that her dog started barking 20 seconds "before the earthquake," then approximately how far was the origin of the earthquake? A) 100 km B) 200 km C) 300 km D) 400 km E) 500 km
How long does it take for a rotating object to speed up from 15.0 rad/s to 33.3 rad/s if it has a uniform angular acceleration of 3.45 rad/s2?
A) 4.35 s B) 5.30 s C) 9.57 s D) 10.6 s E) 63.1 s
An object has kinetic energy of 324 J. If its speed is 9 m/s, what is its mass?
a. 8 b. 36 c. 1620 d. 324