An object with a mass of M = 1kg is placed on a fixed inclined plane with an inclination of 37 ° and a pull f parallel to the inclined plane is applied to the object to make it move upward along the inclined plane from static state. When t = 1s, the pull is removed. The motion image of the object is as follows: (0 to 1s, uniformly accelerating to 20m / s, 1 to 2S, and from 20m / s to 10m / S (incomplete picture)) Calculate the dynamic friction coefficient and the instantaneous power of the pulling force F when t = 1s After completing the figure, calculate the friction heat generated in 6 mews

(1) The acceleration A2 = 10m / s ˇ 2 can be obtained from the image, and the equation mgsin θ + μ mgcos θ = ma2 can be obtained from the force analysis of the object. Substituting the data into μ = 0.50-1s, A1 = 20m / s ˇ 2 can be obtained from the image, and substituting the formula f-mgsin θ - μ mgcos θ = MA1 into the data, f = 30n, P = FV = 30n can be obtained

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