The minimum angle required for a box with a mass of 45 kg to start moving on an inclined plane is 27 degrees. When the mass is doubled to 90 kg, the minimum angle necessary for motion increases due to the increased gravitational force acting on the box. The frictional force can be calculated using the equation F_friction = mg sin(θ), where θ is the angle of inclination. Therefore, the new angle can be determined by analyzing the relationship between mass and the sine of the angle.
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Your (or is it the book's?) solution is correct.physics_freak said:Homework Statement
A box with mass of 45 kg is placed on a flat board. It starts moving when the board is inclined at 27 degrees. If the mass is doubled, what is the minimum angle needed so that it starts moving?
Homework Equations
Frictional force = mgsin[tex]\theta[/tex]
The Attempt at a Solution