a) I think the anwer is right? b) b) A spinning disk is rotating at a rate of 2

Question

a)

I think the anwer is right?

b)  

b)

A spinning disk is rotating at a rate of 2 rad/s in the counterclockwise direction as shown in the figure. What is the direction of the angular velocity vector? down up left right Block 1 (15 kg) is pulled by a rope from left to right up a ramp which is inclined 25 degrees from the horizontal. The rope pulls on block 1 with a force of 300 N parallel to the surface of the inclined plane. The coefficient of kinetic friction between the block and the surface equals 0.7. Assume that the x-axis is parallel to the incline and positive in the direction up the incline. What is the magnitude of the acceleration a of block 1? ? a = m/s2 5.33 7.09 9.43 12.5 16.7 How is the intensity or frequency of the sound wave changing from left to right? Higher Pitch Louder Same Volume Softer Lower Pitch

Explanation / Answer

a) the direcgtion of angular velocity is up ... option b

b) a = (300/15) - ( 9.8*sin 25 + 0.7*9.8*cos 25 ) = 9.6410696 m/sec2 ... option c


c) The intensity is increasin... so.. louder...option b

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