The program installed on the portable computer with an accelerometer detects when the device is dropped and puts the hard drive into safe mode. After installing a program that reads the accelerometer and calculates the apparent weight of the computer, the computer weighs $5$ pounds. During a long flight, the program consistently reports this weight. However, when the plane encounters turbulence for $12$ seconds, the program reports fluctuating apparent weights, as shown in Figure $4\mathrm{.}27.$