Please solve this question step by step. 1. At the instant shown, the 35 kg box

Question

Please solve this question step by step.

1. At the instant shown, the 35 kg box is sliding straight down the incline with a constant speed, and the 18 and 15 kg boxes are moving with it. The point A is [ ] and the point B is [ ], with distance measured in meters. The incline is at an angle of 20 degree with the horizontal. The x-axis is to the right, the y-axis is up, and the z-axis is out of the page. a. What can you say about the coefficient of sliding friction between the 35 kg box and the incline? b. What can you say about the coefficient of static friction between the 18 kg box and the 35 kg box? c. What can you say about the coefficient of static friction between the 15 kg box and the 18 kg box?

Explanation / Answer

If the system is spliding down at constant speed then the net force acting on the block is null.

This means that the vertical an horizontal components of the forces transmitted by the rope exactly balance the friction force (parallel to the incline).

The angle between the rope and the horizontal is 45

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