An external force is acting on a system, the work done on the system is change in its kinetic energy. a) True b) False
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An external force is acting on a system, the work done on the system is change in its kinetic energy.
a) True
b) False
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- In the figure, a constant external force P = 300 N is applied to a 20.0 kg box, which is on a rough horizontal surface. While the force pushes the box a distance of 8.00 m, the speed changes from 0.500 m/s to 2.60 m/s. The work done by friction during this process is closest to P 30° 20 kg -8.0 m O A. +2209 J ОВ.-1948 J OC.-2013 J O D.+1948 J O E. +2013 JA 268-kg crate is being pushed across a horizontal floor by a force P that makes an angle of 40.1 ° below the horizontal. The coefficient of kinetic friction is 0.248. What should be the magnitude of P, so that the net work done by it and the kinetic frictional force is zero? Number i eTextbook and Media Save for Later Units < 0 Attempts: 0 of 5 used Submit Answer(True or False) The work done by the net force equals the change in potential energy. (True or False) The work done by nonconservative forces equals the change in total energy. (True or False) If a force and a change in displacement are in opposite directions, then the force does negative work. (True or False) The work done by the net force equals the change in kinetic energy. (True or False) The work done by the gravitational force equals the negative change in potential energy.
- A car is parked on a hill. The gravitational force on the car is 9.31 x 103 N straight downward, and the angle of the hill is 4° from the horizontal. The car’s brakes fail, and the car slides 30.0 m downhill. a) Calculate the component of the gravitational force that acts parallel to the car’s motion. b) Calculate the work done on the car by gravity as the car slides.1-An object of mass m=2kg which is initially at rest is pushed upward by a horizontal force F= soN along the incline surface as shown in the figure. The coefficient of friction between the mass and the surface is =O.5. The block traveled a distance =10m along the incline under the action of F. Determine a) Work done by the horizontal force b) Work done by the friction force c) Work done by the gravitational force d) Work done by the normal force e The acceleration of the mass f The velocity of the block after it traveled the distance d (g= 10 m/s°, = 37 ° COS37° = 0.8, sin37° = 0.6)Figure 9 shows four situations in which a force F is applied to an object resulting in displacement Ař. The force has the same magnitude in all four cases, but points in different directions. The displacement is exactly the same in all four cases. Which of the following choices correctly ranks the work done by the force on the object? a) W. < Wa < Wa < Wp b) Wa < Wc < W, < Wa c) Wa < Wc < Wa < Wp d) Wa < W, < Wa < Wc e) Wh < Wa < Wa < Wc Ar Δ b Ar Ar Figure 9
- ٢٤The kinetic energy of a system must always be positive or zero. Explain whether this is true for the potential energy of a system.1) A constant horizontal force of F = 200.0 N pushes a crate of mass m = 25.0 kg, initially at rest, along a rough horizontal surface. The crate travels a total distance of 8.00 m, and the coefficient of kinetic friction between the crate and the surface is 0.250. a) What is the work done on the crate by the force F? b) How much does friction increase the internal energy of the crate-surface system ?
- An object of mass m starts at x = A with a speed vi in the +x direction. , where a is a positive 2. For x > A the surface has a coefficient of friction µ(x) constant. Calculate the work done by friction from x = A to an arbitrary point x = B along the box's path of motion. What is the object's kinetic energy at x = B? m Law V1 x = A µ(x) ApplicationAn 8 kg sled is at rest on a horizontal road. The coefficient of kinetic friction between the sled and the road is 0.4. The sled is pulled a distance of 3 m by a force of 40 N applied to the sled at an angle of 30 degree.a) Find the work done by the applied force.b) Find the work done by friction. c) Find the change in kinetic energy of the sled.d) Find the speed of the sled after it has traveled 3 m.1. How much work was done by a machine that exerts a 5000 N force to compress a 10-meter-long steel bar so it becomes 3 meters in length. 2. Find the angle between the 500 N applied force and the 3-meter displacement if the work done is 1500 Joules. Hiii please write a solution thank you