The flatbed truck is traveling at the constant speed of 60 km/h up the 15‐percent grade when the 100‐kg crate which it carries is given a shove which imparts to it an initial relative velocity ˙ x = 3 m / s x˙=3 m/s toward the rear of the truck. If the crate slides a distance x = 2 m measured on the truck bed before coming to rest on the bed, compute the coefficient of kinetic friction μk between the crate and the truck bed.
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Ответ:
μ = 0.309
Explanation:
coefficient of kinetic friction is defined as the ratio of two forces, friction force and the normal force acting on the object.
θ = arctan(15/100)= 8.531⁰
In the vertical direction:
N = mgcosθ = 100 *9.8 *cos(8.531) = 970N
law of conservation of energy implies
mgsinθ - μNx = 1/2m(v₂²-v₁²)
100*9.8*sin (8.531) - μ(970*2) = 1/2(100)(0²-3²)
150.6 - 1940μ = 450
- 1940μ = -600.6
μ = 0.309
Ответ:
is this the òn?
Explanation:
Sense in January 1776 support of the Patriot cause. Using clear, plain language, Paine rallied the colonists to support the break from Britain. He explained, “I am not induced by motives of pride, party, or resentment to espouse the doctrine of separation and independence; I am clearly, positively, and conscientiously persuaded that it is the true interest of this continent to be so.”