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a dump truck slowly tilts its bed upward to dispose of a 95 kg steel cabinet. For small angle of tilt the crate stay put,but when the tilt angle exceeds 23.2° the steel cabinet begins to slide.What is the coefficient of static friction between the bed of the truck and the steel cabinet?​

Respuesta :

Answer:

The value is [tex]\mu  =0.4286[/tex]

Explanation:

From the question we are told that

   The mass of the steel cabinet is  [tex]m =  95 \  kg[/tex]

   The threshold angle is  [tex]\theta  =  23.2^o[/tex]

 Generally at the point just before the steel cabinet starts to slide

     The horizontal force on the steel cabinet is equal to the frictional  force that is

       [tex]F_f  =  F_h[/tex]

Here [tex]F_h[/tex] is the horizontal force which is mathematically represented as

       [tex]F_h  =  m * g cos (theta )[/tex]

and  [tex]F_f  =  \mu N[/tex]

Here N is the normal force acting on the steel cabinet and this is mathematically represented as

      [tex]N  =  mg sin (\theta )[/tex]

=>    [tex] m * g cos (theta )=  mg sin (\theta ) *  \mu  [/tex]

=>    [tex]\mu  = tan (\theta )[/tex]

=>    [tex]\mu  = tan (23.2)[/tex]

=>    [tex]\mu  =0.4286[/tex]

The coefficient of static friction between the bed of the truck and steel cabinet is 0.43.

The given parameters;

  • mass of the steel, m = 95 kg
  • angle of inclination, θ = 23.2⁰

The coefficient of static friction between the bed of the truck and steel cabinet is calculated as follows;

[tex]\Sigma F = 0\\\\mg sin(\theta) - \mu mg cos(\theta) = 0\\\\\mu mg cos(\theta ) = mg sin(\theta)\\\\\mu cos(\theta) = sin(\theta)\\\\\mu = \frac{sin(\theta)}{cos(\theta)} \\\\\mu = tan (\theta)\\\\\mu = tan \ (23.2)\\\\\mu = 0.43[/tex]

Thus, the coefficient of static friction between the bed of the truck and steel cabinet is 0.43.

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