Wednesday, May 13th, 2009

I get the feeling the textbook writers had a list of everyday objects which they randomly picked from to avoid saying “an object” in each exercise. The results are mostly just distracting or mildly amusing, but sometimes they're a bit too much:

Sample Problem 9-6One-dimensional explosion: A ballot box with mass m = 6.0 kg slides with speed v = 4.0 m/s across a frictionless floor in the positive direction of an x axis. The box explodes into two pieces. One piece, with mass m_1 = 2.0 kg, moves in the positive direction of the x axis at v_1 = 8.0 m/s. What is the velocity of the second piece, with mass m_2?

— Halliday, Resnick, Walker, Fundamentals of Physics, 8th ed., page 215