A machine has a rod-shaped steel blade that rotates about its center. The mass of the blade is 0.75 kg and its length is 0.75 . Calculate its rotational kinetic energy when the blade has reached its operating speed of 4000 rpm.
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A machine has a rod-shaped steel blade that rotates about its center. The mass of the blade is 0.75 kg and its length is 0.75 . Calculate its rotational kinetic energy when the blade has reached its operating speed of 4000 rpm.
Let the length of blade is in meters.
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- Problem 9: A solid ball with mass, M=2.5 kg and radius, R=0.2 meter is released from rest from the top of an incline of height, h=3.5 meter. Ignore any energy loss due to friction or air drag. Consider g=9.8 m/s2. (a) The linear speed of the ball at the bottom is ________ (b) The rotational kinetic energy of the ball at the bottom is _________a 40kg disk with a radius of 30 cm is spinning around a fixed vertical axis with an angular speed of 10 rad/s. How much work must be done on the disk to bring it to an angular speed of 20 rad/s? a)270J 200J 150J 100J e)40JQuestion is on the picture