Work energy theorem Definition and 111 Threads

A 65kg bicyclist rides his 8.8kg bicycle with a speed of 14m/s. (a) How much work must be done by the brakes to bring the bike and rider to a stop? (b) How far does the bicycle travel if it takes 4.0s to come to rest? (c) What is the magnitude of the braking force? So for part (a) the...

A particle moving in the x direction is being acted upon by a net force F(x)=Cx^2, for some constant C. The particle moves from x initial =L to x final=3L. What is Delta K, the change in kinetic energy of the particle during that time? I tried thih by doing the integral of F(x), replacing x...

Homework Statement You throw a rock of weight 20.4 N vertically into the air from ground level. You observe that when it is a height 14.9 m above the ground, it is traveling at a speed of 26.0 m/s upward. Use the work-energy theorem to find its speed just as it left the ground; Use the...

I am having some problems, I am on the work energy theorem and I had to do some problems for homework. For one of the questions I was not given enough information. I am supposed to find the initial velocity, when they tell us the final velocity is zero, the coefficient of friction is 0.42...

I am working on the following problem. Susan's 13.0 kg baby brother Paul sits on a mat. Susan pulls the mat across the floor using a rope that is angled 30 degrees above the floor. The tension is a constant 31.0 N and the coefficient of friction is 0.190 . Use work and energy to find Paul's...

A 2kg block at rest on a frictionless surface is pulled for 2s by a 10N horizontal force (pull to the right). Use the Work Energy Theorem to determine the final velocity from the perspective of an observer moving to the left. Does the WET still work that observer? I did the calculations...

This is a highly theoretical question... so beware! The Work Energy(WE) equation in Mechanics says that the net total work done on an object due to various conservative and non-conservative forces equals the change in kinetic energy of the body. This above theorem is usually derived simply from...

The work energy theorem says that ''The work done by the net force acting on a body results change only in its kinetic energy. '' But if the resultant force is in vertically up direction it will surely change its potential energy too, so what's the solution here.

Let's start with the very base of Newtonian mechanics. It works like this : Suppose we work in two dimensions denoted by a x-axis and an y-axis. You can work in as many dimensions as you want because all you have to do is add a unit vector to the formula's, as you will see. Starting from the...

Hello members Please could you help me with solutions for the following two problems that I am stuck with. King Kong is capable of jumping to a maximum vertical height of 10 m. He picks up Enrico Fermi, who is exactly 10% of Kong's mass, and leaps upwards. To what maximum height can King...

I have no clue how to do b, c and especially d. Thanks The cable of the 1,800 kg elevator cab in Fig. 8-51 snaps when the cab is at rest at the first floor, where the cab bottom is a distance d = 3.9 m above a cushioning spring whose spring constant is k = 0.14 MN/m. A safety device clamps...