A Block of Mass M Is at Rest on an Inclined

question 57

Multiple Choice

A block of mass m is at rest on an inclined plane that makes an angle of 30º with the horizontal,as shown in the figure.Which of the following statements about the force of static friction is true?

• A)f_s > mg
• B)f_s > mg cos 30º
• C)f_s = mg cos 30º
• D)f_s = mg sin 30º
• E)None of these statements is true.

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