Q.2 A-How much work is required to stretch a spring by 100 cm. If the graph F-x shown below F(N) A 0 1 2 3 4 5 Slope = 50 x(m) B- Show the net work done on the object by all the conservative and non-conservative forces
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- #4An object with a mass of 3 kg is initially at rest on a horizontal floor. It is then pushed in a straight line for 3.00 m by a trained dog that exerts a horizontal force with a magnitude of 50N. Use the work-energy theorem to find the final speed of the object if there is no friction between the object and the floor. 7.75 m/s 10 m/s O 100 m/s O 12.25 m/s O 7.1 m/sUse g = 9.8 m/s². A force of constant magnitude pushes a box up a vertical surface, as shown in the figure. The box moves at a constant speed. If the mass of the box is 5.5 kg, it is pushed 3.8 m vertically upward, the coefficient of friction is 0.35, and the angle 0 is 30.0°, determine the following. (a) the work done (in J) on the box by F (b) the work done (in J) on the box by the force of gravity (c) the work done (in J) on the box by the normal force (d) the increase in gravitational potential energy (in J) of the system of the box and earth as the box moves up the wall
- A block is displaced vertically by Ar = 2.5 m under the influence of three forces, F = 4.0 N, FR = 6.0 N, and F = 8.0 N as shown in the diagram. The angles 0c = 15°. There are no other forces acting on the block. What is the net work done by these three forces on the block? FB %3D %3D %3D 0c FA W = FArcos(0)Problem Four. The force acting on an object varies as shown in the graph. 10 Find the net work (in joules) done by the force as the particle moves from x= 0.0 m to x= 6.0 m. 4 (В) 12 (E) 28 6.) (C) 38 Fx (N) o (A) 19 (D) 32 -2 .4 -6 Find the average power (in watts) associated with this work if it occurs in 3.0 seconds. O 1 2 3 4 5 6 7 8 9 10 11 12 x (m) 7.) (А) 35 (B) 23 (С) 47 (D) 13 (E) 19 If the mass of the object is 2.0 kg, and its speed is 20 m/s at x = 6.0 m, find its speed at x = 0.0 m. 8.) (A) 19 (В) 17 (С) 25 (D) 29 (E) 37 2.Suppose that 3 J of work is needed to stretch a spring from its natural length of 28 cm to a length of 43 cm. (a) How much work is needed to stretch the spring from 36 cm to 38 cm? (Round your answer to two decimal places.) (b) How far beyond its natural length will a force of 30 N keep the spring stretched? (Round your answer one decimal place.) X cm