8. A man wishes to pull a crate 15 m across a rough floor by exerting a force of 100 N. The coefficient of kinetic friction is 0.25. For the man to do the least work, the angle between the force and the horizontal should be __. A. 0 B. 14° C. 43° D. 66° E. 76°
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The forces include the applied force \( F \), the frictional force \( f_k \), the normal force \( N \), and the gravitational force \( mg \). Show more…
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A man wishes to pull a crate 15m across a rough floor by exerting a force of 100 N. The coefficient of kinetic friction is 0.25. For the man to do the least work, the angle between the force and the horizontal should be: A. 0 B. 14? C. 43? D. 66? E. 76?
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A worker wants to turn over a uniform, 1250-N, rectangular crate by pulling at 53.0$^\circ$ on one of its vertical sides ($\textbf{Fig. P11.65}$). The floor is rough enough to prevent the crate from slipping. (a) What pull is needed to just start the crate to tip? (b) How hard does the floor push upward on the crate? (c) Find the friction force on the crate. (d) What is the minimum coefficient of static friction needed to prevent the crate from slipping on the floor? Figure E11.65 (CAN'T COPY THE FIGURE)
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