Coefficient of kinetic friction between block and surface
A 1.29-kg block slides across a rough surface such that it slows down with an acceleration of 1.40 m/s2. What is the coefficient of kinetic friction between the block and the surface?
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A bicycle wheel of radius 0.32 m rolls down a hill without slipping. Its linear velocity increases constantly from 0 to 5 m/s in 2.9 s. Through what angle does the wheel turn in the 2.9 s?
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The electron has a velocity that has an x component of 30 km/s, a y component of 40 km/s, and a z component of zero. What is the radius of the resulting helical path?
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Over the past century, tornado deaths in the U.S. have been declining significantly. Have the number of observed tornadoes gone down as well? Is there any relationship between these two variables?
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