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8. A 1.70 kg box rests on a plank that is inclined at an angle of 64.0° above the horizontal. The upper
end of the box is attached to a spring with a force constant of 21.0 N/m, as shown in the figure. If the
coefficient of static friction between the box and the plank is 0.29, what is the maximum amount the
spring can be stretched and the box remain at rest?
m
www.
Transcribed Image Text:8. A 1.70 kg box rests on a plank that is inclined at an angle of 64.0° above the horizontal. The upper end of the box is attached to a spring with a force constant of 21.0 N/m, as shown in the figure. If the coefficient of static friction between the box and the plank is 0.29, what is the maximum amount the spring can be stretched and the box remain at rest? m www.
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