推箱子上30度的斜坡,动摩擦系数0.2,箱子质量21kg,求推28m做的功.A crate of mass 21 kg is pushed up a ramp by a person,as shown in the figure below.Assume the coefficient of kinetic friction between the crate and the ramp is k=0.2.Ca
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![推箱子上30度的斜坡,动摩擦系数0.2,箱子质量21kg,求推28m做的功.A crate of mass 21 kg is pushed up a ramp by a person,as shown in the figure below.Assume the coefficient of kinetic friction between the crate and the ramp is k=0.2.Ca](/uploads/image/z/14184065-65-5.jpg?t=%E6%8E%A8%E7%AE%B1%E5%AD%90%E4%B8%8A30%E5%BA%A6%E7%9A%84%E6%96%9C%E5%9D%A1%2C%E5%8A%A8%E6%91%A9%E6%93%A6%E7%B3%BB%E6%95%B00.2%2C%E7%AE%B1%E5%AD%90%E8%B4%A8%E9%87%8F21kg%2C%E6%B1%82%E6%8E%A828m%E5%81%9A%E7%9A%84%E5%8A%9F.A+crate+of+mass+21+kg+is+pushed+up+a+ramp+by+a+person%2Cas+shown+in+the+figure+below.Assume+the+coefficient+of+kinetic+friction+between+the+crate+and+the+ramp+is+k%3D0.2.Ca)
推箱子上30度的斜坡,动摩擦系数0.2,箱子质量21kg,求推28m做的功.A crate of mass 21 kg is pushed up a ramp by a person,as shown in the figure below.Assume the coefficient of kinetic friction between the crate and the ramp is k=0.2.Ca
推箱子上30度的斜坡,动摩擦系数0.2,箱子质量21kg,求推28m做的功.
A crate of mass 21 kg is pushed up a ramp by a person,as shown in the figure below.Assume the coefficient of kinetic friction between the crate and the ramp is k=0.2.Calculate the work done by the person in pushing the crate a distance of 28 m as measured along the ramp.Assume that the crate moves with at a constant velocity.
推箱子上30度的斜坡,动摩擦系数0.2,箱子质量21kg,求推28m做的功.A crate of mass 21 kg is pushed up a ramp by a person,as shown in the figure below.Assume the coefficient of kinetic friction between the crate and the ramp is k=0.2.Ca
F=mgcos30*u+mgsin30=105+21根号3
W=FS=2940+588根号3