Question: The string on a helium balloon is attached inside a car at rest, as shown in Figure 9.22 (a). If the car accelerates forward, does

The string on a helium balloon is attached inside a car at rest, as shown in Figure 9.22 (a). If the car accelerates forward, does the balloon tilt forward or backward? If $a$ is the car's acceleration and $g$ is the gravitational field, what is the balloon's tilt angle from the vertical when it comes to equilibrium?

Data from Figure 9.22 (a)

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