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Q. A worker stands still on a roof sloped at an angle of 39° above the horizontal. He is prevented from slipping by a static frictional force of 440 N. Find the mass of the worker.

Q. A 550 N physics student stands on a bathroom scale in an elevator. As the elevator starts moving, the scale reads 450N. (a) Find the acceleration of the elevator (magnitude and direction) (b) What is the acceleration if the scale reads 670 N? (c) If the scale reads zero, should the student worry? Explain.

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Category:- Physics
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