Energy

The above graph shows the potential energy U(x) of a particle as a function of its position x. The total mechanical energy in the system is marked with the dashed horizontal line at 4 Joules.  1. Present Relevant Variables2. Identify Critical Positions3. Develop Energy Bar Charts

Review Istants Sam, whose mass is 72 kg , straps on his skis and starts down a 64 m -high, 20° frictionless slope. A strong headwind exerts a horizontal force of 200 N on him as he skies. Part A Use work and energy to find Sam's speed at the bottom. Express your answer to two significant figures and include the appropriate units. µA ? Value Units V = Submit Request Answer

A fisherman reels in 12.0 m of line while pulling in a fish that exerts a constant resisting force of 25.0 N.          If the fish is pulled in at constant velocity, how much work is done on it by the tension in the line? Activate to select the appropriates template from the following choices. Operate up and down arrow for selection and press enter to choose the input value typeActivate to select the apropriates symbol from the following choices. Operate up and down arrow for selection and press enter to choose the input value type     nothing J

A 600 N crate slides 12 m at constant speed down a ramp that is tilted 35° above horizontal. ▼ Part A How much work does gravity do on the crate as it slides the 12 m? Express your answer with the appropriate units. W = Submit Part B Eth μĂ Submit Value Request Answer What is the change in thermal energy? Express your answer with the appropriate units. 9 μÅ Value C Request Answer Units Units ? ? 2 of 82 Review Consta

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I need help with 2a and 2b

A 12.0 kg box is pulled 3.00 m to the right along the floor by applied force P=40.0N at 30.0 degrees. The coefficient of kinetic friction is 0.200. a.) How much work is done by the applied force?   b.) How much work is done by the gravitational force?   c.) How much work is done by the force of friction?   d.) Find the net work done on the box.

Can i get help with these questions please

Choose the correct answer 1. We can distinguish three simple cases of action of a force and the work it does on a system when: ? A. When the force acts in the same direction and sense as the displacement, the work it does is positive (W> 0) B. When the force acts in the same direction, but in the opposite direction to the displacement, the work that performs has a negative value (W <0) C. When the force acts in a direction perpendicular to the displacement, it does no work (W = 0)

I need help with the exercise problems from the book "Fundamentals of physics" author Halliday, Resinik. Thank You.

A box of 18kg is released from rest on a rough inclined plane and slides to the bottom. The plane is inclined at a 330 angle to the horizontal and it is 2.8 m high. The coefficient of kinetic friction between the box and the plane is 0.1. A. How much work is done by the normal force? B. How much work is done by the gravitational force during this motion? C. How much work is done by the frictional force during this motion? D. What is the net work done on the box as it slides down the plane? (Be sure to include the sign.) E. Use conservation of energy to determine the speed of the block as it reaches the bottom.

A box is pulled 2.0 meters along a rough surface at constant velocity using 100 N of force inclined at 30° above the horizontal.  a. How much work is done by the: gravitational force, normal force, and frictional force?  b. If the force applied, Fa, is doubled but the frictional force remains the same (this is unlikely to occur in practice since Fn changes), will the net work be the same?  c. If Fa is doubled with the frictional force unchanged, how much kinetic energy would the block have after being pulled 2.0 m?

A van travels on a rough level road with an initial speed vo. The road has a coefficient of kinetic friction Hk. At the instant when the brakes lock, the tires slide than roll.  1. List down the forces that do work on the car.  2. Use the work-kinetic energy theorem to determine the minimum stopping distance of the car in terms of its initial velocity vo, the acceleration due to gravity g and the coefficient uk.  3. Using one of the kinematic equations, determine the time it takes for the car to stop in terms of the initial velocity vo. 4. Use your previous result to determine the power it takes for the car to stop completely.

The second picture are the avilable units and the number of tolerance needed for the answer

I Review I Con A 22.0 kg child plays on a swing having support ropes that are 2.30 m long. A friend pulls her back until the ropes are 45.0° from the vertical and Express your answer in meters per second. releases her from rest. ? V = m/s Submit Request Answer Part C How much work does the tension in the ropes do as the child swings from the initial position to the bottom? Express your answer in joules. ΑΣφ W = J Submit Request Answer

An athlete lifts a 410 N set of weights from ground level to a position over her head, a vertical distance of 1.90 m. How much work (in J) does the athlete do? Assume the weights are moved at constant speed.    J