The speed v of sound waves in a gas can be expressed in terms of the pressure p and the density ? (mass per unit volume) of the gas, as v = apb?c, where a, b, and c, are dimensionless constants. The dimensions of pressure are [M]/[L][T]2
What must be the values of b and c?
b = 1/2, c = -1/2
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When looking for the radial velocity changes or "wobbles" detected due to Doppler shifts, which mass combination is most likely to be detected?
A) high mass star, high mass planet B) high mass star, low mass planet C) low mass star, high mass planet D) low mass star, low mass planet E) a high mass planet; the mass of the star is irrelevant
A student is sitting on the right side of a school bus when it makes a right turn. We know that the force of gravity acts downwards and a normal force from the seat acts upwards. If the student stays in place when the bus turns, we also know that there must be
a. no other force on the student. b. a force parallel to the seat directed forward on the student. c. a force parallel to the seat directed to the left on the student. d. a force parallel to the seat directed to the right on the student. e. a force parallel to the seat in a direction between forward and left on the student.
Which best describes the proper time interval between two events?
A. the longest interval measured by any inertial observer B. the interval measured in the reference frame in which the two events occur a maximum distance from each other C. the interval measured in a reference frame in which the two events are simultaneous D. the interval measured in a reference frame in which the two events occur at the same place E. None of these choices are correct
The y-component of a force vector is -15.0N, while its magnitude is 27.2N. Which could be the vector’s direction?
A. 
below the +x axis
B. 
below the -x axis
C. 
below the -x axis
D. 
below the +x axis
E. None of the choices are correct.