Question

Question 5 A spinning wheel initially has an angular velocity of 50rad/s east: 20s later its angular velocity is 50rad/s west. If the angular acceleration is constant, what are (a) the magnitude and direction of angular acceleration, (b) the angular displacement over 20 s and (c) the angular speed? Question 6 Use Calculus to derive the Work- Energy Theorem and use the equation to solve the following questions Question 7. A crate of Mass 50kg slides down a 30o incline. The crate's acceleration is 2.0m/s, and the incline is 10m long. (a) What is the kinetic energy of the crate s it reaches the bottom of the incline? How much work is spent overcoming friction? What is the magnitude of the frictional force that acts on the crate as it slides down the incline?

Answer 1

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