A т в с 3.20 m 2.00 m

A particle is moved along the x-axis by a force that measures 8/(1 + x)2 pounds at a point x feet from the origin. Find the work W done in moving the particle from the origin to a distance of 7 ft.

A block of mass ?=0.350kg is released from rest, from a curved ramp of height h= 42.0 cm (point A in the figure). The block slides down frictionless to the bottom of the ramp to point B. a) What is work done by gravity when the block moves from A to B? b) What is the speed of the block at the bottom of the ramps (point B in the figure)? c) The box continuesto slide frictionless and compress a spring a distance Δ?=8.20cm until it stops at point C. What is the spring constant k of the spring? d)What is the elastic potential energy stored in the spring when the block is at point C?

A 4.5-kg block slides down a frictionless incline making an angle of 55.0° with the horizontal. (a) What is the total work done on the block when the block slides 1.4 m (measured along the incline)? (b) What is the speed of the block after it has slid 1.2 m if it starts from rest? m/s (c) What is its speed after 1.2 m if it starts with an initial speed of 1.6 m/s? m/s You can use the definition of work as the scalar product of a constant force and displacement to find the work done by each force acting on the block. Then use the work- kinetic energy theorem the find the speed of the block at any given location and for any initial kinetic energy it may have.

In the figure, a frictionless roller coaster car of mass m - 992 kg tops the first hill with speed vo- 11.9 m/s at heighth-47.0 m. How much work does the gravitational force do on the car from that point to (a) point A, (b) point B, and (c) point C? If the gravitational potential energy of the car-Earth system is taken to be zero at C, what is its value when the car is at (d) Band (e) A? First

A single conservative force acts on the a 5.0 kg object.  The equation Fx = 2x + 4 describes the force, where x is in meters.  As the object moves along the x axis from x = 1.0 m to x = 5.0 m calculate the work done by this force.

A 10 kg barbell is rolling down a hill. There is no friction or air resistance acting on it, only the force of gravity. If it starts out moving 2 ms1, and ends up moving 7 ms1, then how much work does gravity do on it?

A mother pulls her child on a sled across a rough patch of snow. The sled and child have a combined mass of 25kg. The sled’s tow rope is at 42° angle above the horizontal and the mother exerts a force of 65N. If the sled accelerates from rest at 1.5 m/s2 over 15m, what is the work done by friction on the sled?

A tennis ball of mass m = 0.091kg is thrown straight up with an initial speed v_{0} = 14m / s Let the gravitational potential energy be zero the initial height of the tennis ball a.what is the maximum height , h in meters the ball reaches B. What is the work done by gravity W_{g} Joules, during the ball's flight to its maximum height?

The graph shows the xx component of a force that acts on an object that moves on the x axis. The vertical spacing between adjacent grid lines is 4.93N, while the horizontal spacing between adjacent grid lines is 1.0m.  What is the work, in joules, done by the force as the object moves from x=4m to x=5m?