Question

Q1)At the surface of Jupiter's moon Io, the acceleration due to gravity is 1.81 m/s2 . A watermelon has a weight of 47.0 N at the surface of the earth. In this problem, use 9.81 m/s2 for the acceleration due to gravity on earth.

a-What is its mass on the earth's surface?

b-What is its mass on the surface of Io?

c-What is its weight on the surface of Io?

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Q2)The upward normal force exerted by the floor is 620 N on an elevator passenger who weighs 650 N.

a-What is the magnitude of the acceleration?

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Q3)A chair of mass 16.0 kg is sitting on the horizontal floor; the floor is not frictionless. You push on the chair with a force F = 38.0 N that is directed at an angle of 43.0 ∘ below the horizontal and the chair slides along the floor.

a-Use Newton's laws to calculate the normal force that the floor exerts on the chair.

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Q4)An athlete whose mass is 94.5 kg is performing weight-lifting exercises. Starting from the rest position, he lifts, with constant acceleration, a barbell that weighs 540 N . He lifts the barbell a distance of 0.60 m in a time of 1.6 s .

a-Use Newton's laws to find the total force that his feet exert on the ground as he lifts the barbell.

Express your answer using two significant figures.

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Answer 1

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