Determine the kinetic energy of a circular disc rotating with a speed of 60 r.p.m- about an axis passing through a point on its circumference and perpendicular to its plane. The circular disc has a mass of 5 kg and radius 1 m.
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- The answer is supposed to be v=2.56m/s but I'm not sure how to write out the problem.A grindstone with a mass of 48.2kg and radius 0.856m maintains a constant rotation rate of 4.93rev/s by a motor while a knife is pressed against the edge with a force of 7.38N. The coefficient of kinetic friction between the grindstone and the blade is 0.8. If the motor shuts off how many seconds will it take for the grindstone to come to a stop? Take the moment of inertia of a disk to be I = 1/mr²Help with this physics problem
- B. A compact disk rotates from rest to 420 rev/min in 4.5 seconds. (a) How far does a point on the edge of the disk, radius 8.0 cm, travel during this interval? (b) If the disk has mass of 18.2 grams, what is its kinetic energy when rotating at 400 rev/min? (I = MR2) (c) What average power is needed to accelerate the disk to 420rev/min in 4.5 seconds?A high-speed sander has a disk 4.10cm in radius that rotates about its axis at a constant rate of 1250 revolutions per minute. a) Determine the angular speed of the disk in radians per second. b) Determine the linear speed of a point 1.80cm from the disk's center c) Determine the centripetal acceleration of a point on the rim. d) Determine the total distance traveled by a point on the rim in 1.80s.4
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- Imagine a spinning solid melon. It has a mass of 1.0 kg and a 18-cm diameter. It turns a rate of 77rev/min. Find its kinetic Energy If an additional 5.0mJ of energy are added to the rotational energy, what is the new angular velocity of the melon?0 out of 15 p A grindstone has a radius of 13.00 cm and rotates at 13000 rev/min. What is the linear speed (in m/s) of a point on its edge? Selected Answer: O 31.6 Correct Answer: 176.79644 6/170 79644- 182 79644)Two people start at the same place and walk around a circular lake in opposite directions. One has an angular speed of 2.05 x 10-3 rad/s, while the other has an angular speed of 3.78 x 10-3 rad/s. How long will it be before they meet? Number i Start Units 02 0₁ End