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Doris is trying to lift a stack of books off the table. The stack of books has a mass of 15 kg. What minimum upward force must Doris exert on the books to lift the books off the table? {Ans: }A 1 cm long section of the patellar ligament stretches to 1.001 cm when it is subjected to a tensile force of 10,000 N. What is the strain in this segment of ligament? {Ans: }Adelaide performs a triple twisting jump while figure skating. She rotates around her longitudinal axis three times while she is in the air. The time it takes to complete the jump from takeoff to landing is 0.8 s. What was Adelaide's average angular speed in twisting for this jump? {Ans: }A 0.43 kg soccer ball is stationary on the field when Darryl kicks it. Darryl's foot is in contact with the ball for 0.01 s during the kick. The horizontal velocity of the ball as it leaves his foot is 25 m/s. What is the average horizontal force exerted by Darryl's foot on the ball during the 0.01 s of contact (assume that friction between the ball and the field is zero)?