A train has an acceleration of magnitude 0.80 m/s² while...

A train has an acceleration of magnitude 0.80 m/s² while stopping. A pendulum with a 0.45-kg bob is attached to a ceiling of one of the cars. Part A What quantities can be determined using the given information? Check all that apply. angle that the pendulum makes with the vertical during the decceleration of the train force of tension in the string that supports the bob during the decceleration of the train time of the decceleration of the train speed of the train before the decceleration

Transcript

00:01 The train was moving in this direction and a train has an acceleration of magnitude 0 .8 meter per second square while stopping.

00:13 It means the magnitude of acceleration is 0 .8 meter per second square.

00:20 But if its direction is opposite to the direction of motion of the train because this is the acceleration while stopping.

00:29 I mean, this is a retardation, right? train is moving in this direction.

00:36 So when brakes are applied, the braking force or the braking acceleration will act in the opposite direction.

00:45 So this acceleration has a magnitude of 0 .8 meter per second square, but its direction is opposite to the direction of the motion of train, right? that is why they are asking about the magnitude.

00:58 Now, say, same is what happens.

01:02 Suppose this is a, this is a boggy of train.

01:07 This is a boggy of train.

01:09 And train was moving, say, moving on the tracks.

01:16 So, and a pendulum was hanging, say, means from one of the boggy here.

01:22 We will draw the detail f means free body diagram.

01:25 So when train tries to stop and applies a backward acceleration, it means the the means the means momentum of the train is reduced in this direction the backward force is applied on the train now as a action and reaction and law of conservation of linear momentum the train applies i mean everybody is sitting on the train experiences a force in the forward direction so if you try to stop the train we all will if the train stops suddenly or any vehicle stop suddenly, we all try to bend forwards.

02:12 Because to stop the vehicle, the force is supplied on the backside, i mean, in the opposite direction of the motion of the train.

02:24 So as a reaction to that or as a law of conservation of lees, say, means linear momentum, the force is supplied on us in the same is forward.

02:35 Direction.

02:36 So similarly the force is applied on the pendulum also in the forward direction and because of that the pendulum swings up.

02:49 This is the case...

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