47. (II) In Fig. 4-56 the coefficient of static friction between mass ma and the table is 0.40, whereas the coefficient of kinetic friction is 0.20. (a) What minimum value of m will keep the system from starting to move? (b) What value(s) of ma will keep the system moving at constant speed? [Ignore masses of the cord and the (frictionless) pulley.] mA mg = 2.0 kg FIGURE 4-56 Problem 47.

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.