You need to move a cubic crate across a rough floor. You pull the crate horizontally using a rope with force F, as shown in Figure 1. The weight of the crate is 700 lb;, its density is 180 lbm/ftº, and the coefficient of static friction between the crate and the floor is 0.57. Write an expression for the maximum static friction force fmas (in lb:) as a function of the mass m of the crate. Use Excel to plot fmax(7). • Calculate the average pressure of the crate on the floor, in psi. • Calculate the minimum force F necessary for the crate to start moving, in lb;. F

You need to move a cubic crate across a rough floor. You pull the crate horizontally using a rope with force F, as shown in Figure 1. The weight of the crate is 700 lb;, its density is 180 lbm/ftº, and the coefficient of static friction between the crate and the floor is 0.57. Write an expression for the maximum static friction force fmas (in lb:) as a function of the mass m of the crate. Use Excel to plot fmax(7). • Calculate the average pressure of the crate on the floor, in psi. • Calculate the minimum force F necessary for the crate to start moving, in lb;. F

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.

Question

You need to move a cubic crate across a rough floor. You pull the crate horizontally using a
rope with force F, as shown in Figure 1. The weight of the crate is 700 lb:, its density is 180
lbm/fts, and the coefficient of static friction between the crate and the floor is 0.57.
Write an expression for the maximum static friction force fmax (in lb:) as a function of
the mass m of the crate. Use Excel to plot fmax(m).
Calculate the average pressure of the crate on the floor, in psi.
Calculate the minimum force F necessary for the crate to start moving, in lb;.
F
Figure 1. Moving a crate on a slope.

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