A 1250 kg car drives up a hill that is 15.2 m high. During the drive, two nonconservative forces do work on the car: (i) the force of friction, and (ii) the force generated by the car's engine. The work done by friction is -2.91x105 J; the work done by the engine is 6.74x105 J. Part A Find the change in the car's kinetic energy from the bottom of the hill to the top of the hill. ΜΕ ΑΣΦ AK = ? J
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- How much work must you do to push a 12.0 kgkg block of steel across a steel table (μkμk = 0.60) at a steady speed of 1.20 m/sm/s for 5.30 ss ? Express your answer with the appropriate units. What is your power output while doing so? Express your answer with the appropriate units.helpA crate with mass m = 33.3 kg being pushed up an incline that makes an angle φ = 22.7 degrees with horizontal. The pushing force is horizontal, with magnitude P, and the coefficient of kinetic friction between the crate and the incline is μ = 0.358. Consider the work done on the crate as it moves a distance d = 5.32 m at constant speed. a. What is work done by the pushing force, in joules? b. What is the work done by friction, in joules? c. What is the work done by gravity, in joules? d. What is the net work, in joules?
- Ayoung woman on a skateboard is pulled by a rope attached to a bicycle. The velocity of the skateboarder is v = (4.6 m/s )ê and the force exerted on her by the rope is F = (17 N)â + (12 N)ỹ. Part A Find the work done on the skateboarder by the rope in 25 seconds. Express your answer using two significant figures. ? W = J Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining Review your calculations and make sure you round to 2 significant figures in the last step. Part B Assuming the velocity of the bike is the same as that of the skateboarder, find the work the rope does on the bicycle in 25 seconds. Express your answer using two significant figures. Πνα ΑΣφ ? W = JPart A How much work must you do to push a 13 kg block of steel across a steel table at a steady speed of 1.3 m/s for 5.4 s? The coefficient of kinetic friction for steel on steel is 0.60. Express your answer in joules. %3D push = J Submit Request Answer Part B What is your power output while doing so? Express your answer in watts. ΑΣφ P = W %3D Submit Request Answer Next >Part A A child pulls a sled with constant speed pulling the rope at an angle of 30° to the horizontal and drags the sled for 100 m. The friction coefficient is 0.40. What work did the friction force do if the sled's mass is 5.1 kg? Express your answer with the appropriate units. W = 1624.2 J Ć ?
- A 23.3-kg child descends a slide 3.4 m high and reaches the bottom with a speed of 1.9 m/s. Part A How much thermal energy due to friction was generated in this process? Express your answer using two significant figures.Part A A horizontal spring with spring constant 140 N/m is compressed 17 cm and used to launch a 2.1 kg box across a frictionless, horizontal surface. After the box travels some distance, the surface becomes rough. The coefficient of Use work and energy to find how far the box slides across the rough surface before stopping. kinetic friction of the box on the surface is 0.15. Express your answer using two significant figures. ? cm = 1Part A With what minimum speed must you toss a 180 g ball straight up to just touch the 13-m-high roof of the gymnasium if you release the ball 1.2 m above the ground? Solve this problem using energy. Express your answer with the appropriate units. HA Umin = Value Units Submit Request Answer Part B With what speed does the ball hit the ground? Express your answer with the appropriate units. μΑ Value Units
- Part A A 45 kg softball player slides into second base, generating 350 J of thermal energy in her legs and the ground. How fast was she running? Express your answer with the appropriate units. HẢ Value Units Submit Request Answer Provide FeedbackPart A What is the minimum work needed to push a 900-kg car 860 m up along a 9.5° incline? Ignore friction. Express your answer with the appropriate units. WP = µÅ Value Units ?Part A How much work must you do to push a 12.0 kg block of steel across a steel table (k = 0.60) at a steady speed of 1.20 m/s for 1.90 s? Express your answer with the appropriate units. ► View Available Hint(s) W push = Submit Part B O Value μA What is your power output while doing so? Express your answer with the appropriate units. ► View Available Hint(s) μA P = Value Units Units ? ?