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The figure shows a 0.377-kg block sliding from A to B along a frictionless surface. When the block reaches B, it continues to slide along the horizontal surface BC where the kinetic frictional force acts. As a result, the block slows down, coming to rest at C. The kinetic energy of the block at A is 41.0 J, and the heights of A and B are 12.6 and 7.00 m above the ground, respectively. (a) What is the value of the kinetic energy of the block when it reaches B? (b) How much work does the kinetic frictional force do during the BC segment of the trip? ~ hA=12.6 m (a) Number i MI Number i B hg -7.00m hc-7.0 Units Units () ()
Attempt in Progress A pitcher throws a curveball that reaches the catcher in 0.59 s. The ball curves because it is spinning at an average angular velocity of 340 rev/min (assumed constant) on its way to the catcher's mitt. What is the angular displacement of the baseball (in radians) as it travels from the pitcher to the catcher? Number i Units
A Ferris wheel rotates at an angular velocity of 0.26 rad/s. Starting from rest, it reaches its operating speed with an average angular acceleration of 0.037 rad/s². How long does it take the wheel to come up to operating speed? Number Units
Two people start at the same place and walk around a circular lake in opposite directions. One has an angular speed of 2.50 x 10-3 rad/s, while the other has an angular speed of 6.02 x 10-3 rad/s. How long will it be before they meet? Start Number i 0₂ 0₁ Units End