3. The potential energy U in Joule of a particle of mass is 4kg moving in the x-y plane is given by the formula U = 6x + Sy+ 5. Here x and y are coordinates of the particle in meter. The particle is at (3,5) at t = 0 and v , = 0. i and jare the unit vectors across x and y axis respectively. a. Find the force acting on the particle

a. A 10.0 kg object has an initial velocity of (5.0i + 3.0j) m/s. What is its kinetic energy at this time? KE = ½ mv² where v² = V.V

Do not use Ug=mgh. Please

A crate with mass m = 33.3 kg being pushed up an incline that makes an angle φ = 22.7 degrees with horizontal. The pushing force is horizontal, with magnitude P, and the coefficient of kinetic friction between the crate and the incline is μ = 0.358. Consider the work done on the crate as it moves a distance d = 5.32 m at constant speed. a. What is work done by the pushing force, in joules?  b. What is the work done by friction, in joules?  c. What is the work done by gravity, in joules?  d. What is the net work, in joules?

A hand pushes a 3 kg block along a table from point A to point C as shown in the figure below. The table has been prepared so that the left half of the table (from A to B) is frictionless. The right half (from B to C) has a non-zero coefficient of friction equal to µ. The hand pushes the block the full distance from A to C using a constant force of 5 N. The block starts off at rest at point A and comes to a stop when it reaches point C. The distance from A to B is 0.5 m and the distance from B to C is also 0.5 m. We will consider the block by itself as our system so all forces on the block are external. Initial position of block Final position ofblock P no friction friction A B C -1½ m 1½ m

The diagram below shows the potential energy U of a particle (in joules) as a function of its position x. 4 D 2 A 1 -1 -2+ B A particle is initially at point B. It is moving to the right, and its total energy is 4 J. Which of the following most accurately describes the motion of the particle? Ignore friction. O The particle will move between A and C indefinitely. O The particle will eventually come to rest at B. O The particle will come to rest at C. O The particle will come to rest at D. O The particle will move past D and continue to the right. O Something else will happen.

1. Carlo pushes a 35-kg box on a flor level and displaces it 5 m from its initial position. a. If the force applied to the box is 500 N, what must be the magnitude and the direction of the frictional force on the surface? b. How much work is done by Carlo and by friction on the box? c. How much work is done on the box by the normai force and by gravity? d. What is the net work done on the box by all of the forces applied to it?

A man pulls a 25 kg box in a horizontal fashion with 60N of force over a surface with us = 0.15 and uk = 0.05. a. After pushing it for 10m, how much thermal energy is produced? b. What is the net work done on the system? Draw a FBD.

i just need help with C and D A big ship with a mass of 5.95 x 10 7 kg has a speed of 11.0 m/s at some instant. A. What is the ship’s kinetic energy?   B. How much work is required to stop it?   C. How is work related to the mechanical energy?   D. What is the magnitude of the constant force required to stop it as it undergoes a displacement of 2.75 km?

You push your physics book 2.40 m along a horizontal tabletop with a horizontal push of 3.00 N while the opposing force of friction is 0.700 N. a. How much work does your 3.00 N push do on the book? b. How much work does the normal force from the table do on the book? c.