A small 25g toy rocket is launched straight up from the ground at 144 km/h (a) What is the  kinetic energy of the toy rocket? (b) Find the work done by gravity after it has risen 220 m. (i) (a). The kinetic energy of the toy rocket is = (b). The work done by gravity after it has risen 220 m is =

A horizontal force, acts on an 8N box. The box moves 12 m horizontally at a constant speed. The coefficient of kinetic friction is 0.25. Determine the work done by the horizontal force.

1. A force of F = 5.6 Ni + 9.7 Nj + 7.9 Nk is applied to a particle in space to move it at a distance r = 2.6mi - 5.8mj - 9.7mk . Determine the work done by force.

A 13 N force with a fixed orientation does work on a particle as the particle moves through displacement à = (3î − 5ĵ + 3k) What is the angle between the force and the displacement if the change in the particle's kinetic energy is (a) +17.0 J and (b)-17.0 J? (a) Number i (b) Number i eTextbook and Media Units Units m.

1. A jeep with mass of 2000 kg is going 18 m/s at the bottom of a hill that is 50.0m high. When it reaches the top, it is travelling at 10m/s. (a) what is the total work done by all forces (the jeep engine, the mud, gravity, etc) as it ascends the hill? (b) What is the minimum work required by engine of the jeep if only the engine and gravity are doing work (if there is na friction, forces from mud, etc)?

1-) A box with a mass of 10 kg is pulled along a roughly inclined plane at an initial speed of 1.5 m / s. The pulling force is 100 N parallel to the inclined plane at an angle of 20 ° to the horizontal. If the kinetic coefficient of friction is 0.4 and the case is pulled to a distance of 5 m, (a) How much work is done against gravity? (b) How much work is being done against friction? (c) How much work does a 100 N force do? (d) What is the change in the kinetic energy of the chest? (e) What is the speed of the crate after 5 m has been towed? (sin20 ° = 0.35 and cos20 ° = 0.94)

E21) a)Write the work done by a conservative force in terms of its potential energy. b)In what direction are forces pointing to be considered centripetal? c)In a system of interacting particles, what conservation law results when ∑Fiext=? d)Anobjectexperiencingseveralforcesresultinginsomedisplacement.What is the net work done by these forces equal to If the work of one of these forces is path-dependent, then what is not conserved? e) If a frictional force causes the total mechanical energy of a system to decrease, then     I) what happens to the system’s total internal energy?    ii) what is truly conserved?

2. Nicole lifts a bowling ball with a mass of 6.2 kg to a height of 1.5 meters above the floor. (a) How much work does she do to lift it? [be careful! E-S-AJ (b) How much gravitational potential energy (GPE) does the ball now have relative to the floor? (E-S-AJ (c) Work put into lifting an object to a given height is (greater than, less than, equal to) the GPE of the object as it rests at that height. (d) How much kinetic energy (KE) does the ball have as she holds it at rest at this height? while increasing in (height. (e) If she drops the ball, the ball will decrease in (height, speed) This indicates a transference of (KE, GPE) to (KE, GPE) speed)

A block of mass 15kg slides down a ramp inclined at 28.0 above the horizontal. As it slides, a kinetic friction force of 30N parallel to the ramp acts on it. If the block slides 3m along the ramp, find..... a) the work done on the block by friction?  b) the work done on the block by the force of gravity?  c) the work done on the block by the normal force?  d) the total work done on the block?    Why is b not a negative answer?    Please provide a complete solution set without any skipped steps and please double check your work.

1)A force on a particle depends on position such that F(x) = (3.00 N/m2)x2 + (6.00 N/m)x fora particle constrained to move along the x-axis. What work is done by this force on aparticle that moves from x = 0.00 m to x = 2.00 m?