A car is accelerating at a rate of 2.5 m/s².A mass of 250 g is hanging from the ceiling on a string 1.2 m long.The angle that the string makes with the vertical is A)14.3º toward the back of the car. B)76º toward the back of the car. C)7º toward the front of the car. D)14.3º toward the front of the car. E)0º,or straight down.

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Quizplus · Accepted Answer

The correct answer is A because the car is accelerating forward, so the string will be pulled back toward the rear of the car. The angle that the string makes with the vertical will be given by:sin(theta) = (a/g) = (2.5 m/s^2 / 9.8 m/s^2) = 0.255theta = sin^-1(0.255) = 14.3º

A Car Is Accelerating at a Rate of 2