Halliday, Resnick & Walker — Force and Motion–I: Problem 60

Figure 5.28 shows a 5.00 kg block being pulled along a frictionless floor by a cord that applies a force of constant magnitude 20.0 N but with an angle \(\theta(t)\) that varies with time. When angle \(\theta = 25.0^{\circ}\), at what rate is the acceleration of the block changing if (a) \(\theta(t) = (2.00 \times 10^{-2} \text{ deg/s})t\) and (b) \(\theta(t) = -(2.00 \times 10^{-2} \text{ deg/s})t\)? (Hint: The angle should be in radians.)