Conservation of Energy: Rotating Object Examples Example 1: A 50 N force is applied tangentially to...
A potter's wheel with a moment of inertia of 8.0kg-m^2 has 5.0 N-m applied to it. It starts from rest. 10. seconds later it has gained what kinetic energy? (The answer is 78J, but I don't know how to arrive at the answer.)
A potter's wheel having a radius of 0.500 m and mass 45.0 kg is rotating freely at 50.0 rev/min in a clockwise direction. The potter can stop the wheel by pressing a wet rag against the outside rim of the wheel and exerting a radially inward force of 70.0 N. Since this force is in the radial direction, it alone cannot cause the wheel to slow its spinning. What can happen, however, is that a normal force can result from...
A force is applied to a 3.5 kg object moving in the x-direction with the following profile over time: a. What value of F_max gives an impulse of 6.0 N s? b. If the object had an initial speed of 4.2 m/s, what was the change in kinetic energy after the force was applied?
A horizontal 810-N merry-go-round of radius 1.40 m is started from rest by a constant horizontal force of 45 N applied tangentially to the merry-go-round. Find the kinetic energy of the merry-go-round after 4.0 s. (Assume it is a solid cylinder. Also assume the force is applied at the outside edge.)
A 100 kg object experience a net force of (120i+140j) N, it is initially at rest, and its position starts at the origin. What is the object's acceleration? After 4 seconds, what is the velocity of this object? What is its position after 5 seconds (x,y), distance from the origin and angle defined from the positive x-axis?
The impulse of an object is 1 a. the product of (the peak force applied to an object) x (time interval during which the force acts). 2 b. the product of (the average force applied to an object) x (time interval during which the force acts). 3 c. the average force applied to an object for a period of 1 sec. 4 d. the peak force applied to an object for a period of 1 sec. 5 e. the total...
A force of 30 N accelerates a 2.0 kg object from rest for a distance of 3.0 m along a level, frictionless surface; the force then changes to 15 N and acts for an additional 2.0 m. (a) What is the final kinetic energy of the object? (b) How fast is it moving?
A constant torque of 30 N-m acts on a 5 kg flywheel whose moment of inertia is 2 kg-m^2. If the wheel starts from rest, after 10 seconds it will have a rotational kinetic energy of 9 kJ 23 kJ 56 kJ 45 kJ
A 10 N horizontal force is applied to a 50 N block initially at rest on a rough horizontal surface. If the coefficient of static friction is 0.5 and the coefficient of kinetic friction is 0.4, then the frictional force on the block is A : 10 N B : 20 N C : 25 N D : 0 N
The impulse shown is applied to a 2.0 kg object. If the object is initially at rest, what is the velocity after the force is applied? FN)F 18 000 N 20 000 15 000 10 000 5 000 t(ms