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PHSX 114 - Homework #7

PHSX 114 - Homework #7 - is at an angle of θ = 35.0° to...

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PHSX 114 – HOMEWORK #7 Question 1: (2 points) The cable supporting a 2,225-kg elevator has a maximum strength of 2.966E4 N. What maximum upward acceleration can it give the elevator without breaking? Enter scientific notation as 1.23E4. Number Units Question 2: (2 points) Arlene is to walk across a “high wire” strung horizontally between two buildings 8.00 m apart. The sag in the rope when she is at the midpoint is 8.20°. If her mass is 56.0 kg, what is the tension in the rope at this point? Enter scientific notation as 1.23E4. Number Units Question 3: (2 points) A person pushes a 19.5-kg lawn mower at constant speed with a force of 92.5 N directed along the handle, which

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Unformatted text preview: is at an angle of θ = 35.0° to the horizontal. Note : In numerical answers, enter only the magnitude of the number, without a sign. Enter scientific notation as 1.23E4. a. Calculate the horizontal friction force on the mower. [Num] [Units] b. Calculate the normal force exerted vertically upward on the mower by the ground. [Num] [Units] c. What force must the person exert on the lawn mower to accelerate it from rest to 1.20 m/s in 3.10 seconds, assuming the same friction force? [Num] [Units] *HINT: If the positive direction is forward (as is assumed since the force of the person is listed as positive) then the frictional force should be negative....
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