A 1,300-N crate is being pushed across a level floor at aconstant speed by a force F of 390 N at an angle of 20.0° below thehorizontal, as shown in the figure a below. Two figures show a sideview of a crate positioned upon a horizontal surface. Figure (a):An arrow pointing downward and to the right is labeled vector F andforms an angle of 20° below the horizontal as it approaches theupper left edge of the crate. Figure (b): An arrow pointing upwardand to the right is labeled vector F and forms an angle of 20°above the horizontal as it extends from the upper right edge of thecrate.
(a) What is the coefficient of kinetic friction between thecrate and the floor? (Enter your answer to at least three decimalplaces.)
0.256 Correct: Your answer is correct.
(b) If the 390-N force is instead pulling the block at an angleof 20.0° above the horizontal, as shown in the figure b, what willbe the acceleration of the crate? Assume that the coefficient offriction is the same as that found in part (a).
0.7 Incorrect: Your answer is incorrect.
