A particle moves along the loop A-B while a conservative force acts on it. Work done by the force along the various sections of the path are - WA-=-50 J ; Wg - c = 25 J; Wc-p= 60 J. Assume that potential energy of the particle is zero at A. Write the potential energy of particle when it is at B and D.
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- 1. A 50 kg sled is pushed by applying a force F = 400 N, as shown, with = 30°. The surface is rough with 4 =.4. If the sled is being displaced a distance of 60 m, find the work done on the sled by: a. An applied force F. b. The dissipative force. c. The normal force. d. The weight. F. e. The net force.A 2kg package is moves up along a 10 m ramp AC inclined at 15' with an initial speed of 5 m/s. Knowing that the coefficient of sliding friction between the package and the incline is 0.2, answer the following questions: 10 m B 15° d 1. What force/s do/does NOT do any work on the package as it moves along the incline? 2. What is the work done by friction on the package as it moves a distance x along the incline? 3. What is the change in the kinetic energy from A to B if at position the package becomes zero? 4. What is the change in the potential energy from A to B if at position B the velocity of the package 5. What is the maximum distance that the package will move up the incline?A 2,200-kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 4.60 m before coming into contact with the top of the beam, and it drives the beam 15.0 cm farther into the ground as it comes to rest. Using energy considerations, calculate the average force the beam exerts on the pile driver while the pile driver is brought to rest. 588925.42 magnitude Write an expression for the work done by all of the forces acting on the beam as it moves into the ground and relate that work to the change in energy of the pile driver in order to find the force that the beam exerts on the pile driver. N
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- Two 37.0-lbm twins are playing in their backyard. One toddler is running full speed at 5.5 mph and his path will take him directly into a brick wall. His sister has climbed a 3.5-ft ladder and is perched precariously atop it. Calculate the kinetic and potential energies of the two twins with respect to their stationary destinations (the wall and the ground). Boy Girl i KE (lbf.ft) PE (lbf.ft) If potential energy is completely converted to kinetic energy during the girl's fall, how fast will she be travelling upon impact? mph1. You push a 67 kg box across a floor where the coefficient of kinetic friction is uk = 0.55. The force you exert is horizontal.(a) How much power is needed to push the box at a speed of 0.50 m/s?(b) How much work do you do if you push the box for 35s? Explain and draws.Suppose a 1300-kg elevator car is lifted a distance 45 m by its cable at a constant speed, assuming the frictional force on the elevator has a constant value of 1350 N. 1.Calculate the work done on the elevator by its cable, in joules. 2.Calculate the work done by the gravitational force on the elevator, in joules, during this process. 3.Calculate the total work done on the elevator, in joules.
- A force FY shown in the figure below acts on a particle moving along the y axis. Each unit in the y(m) axis is equal to 2.0m and each unit in the Fy (N) axis is equal to 3.0N. Determine the work done on the particle by this force as it moves from the following initial to final positions. A. From y=A to y=B B. From y=B to y=C C. From y=A to y=C.A force F=(4- 3N acts on an object as it moves in the x direction from the origin to S. The work done on the object by the force is Select one: а. 50 J b. 42 J С. 36 J d. 28 J1. A 23.0 kg child is playing on a swing with a length of 2.5 m. If the swing starts from rest and makes an angle of 40.0◦ with the vertical at the top of the swing, a) determine the child’s speed at the bottom of the swing neglecting friction. b) If the swing has a speed of 2.8 m/s at the bottom, determine the work done by friction during the downswing and, bonus) assuming the force of friction is constant, determine the maximum angle the swing attains on the upswing after passing through the bottom. Hint: Use the approximation that cos θ ≈ 1 − 1 2 θ 2 for angles given in radians.