Part A A typical wind turbine extracts 40% of the kinetic energy of the wind that blows through the area swept by the blades. For a large turbine, 120,000 kg of air moves past the blades at 16 m/s every second. If the wind turbine extracts 40% of this kinetic energy, and if 90% of this energy is converted to electric energy, what is the power output of the generator? Express your answer with the appropriate units. Poutput = Value Units

Part A A typical wind turbine extracts 40% of the kinetic energy of the wind that blows through the area swept by the blades. For a large turbine, 120,000 kg of air moves past the blades at 16 m/s every second. If the wind turbine extracts 40% of this kinetic energy, and if 90% of this energy is converted to electric energy, what is the power output of the generator? Express your answer with the appropriate units. Poutput = Value Units

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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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 = J
You take a 13kg bag of lead pellets and drop it from 2m above the ground.a. How much gravitational potential energy does the bag have when held 2m above the ground?b. The bag is dropped. Just before it hits the ground, how much kinetic energy does it have?c. How fast is the bag moving just before it hits the ground?d. When it hits the ground, the kinetic energy will be transformed mostly into thermal energy. If 40%of this energy goes into the lead pellets as heat, what will be the increase in temperature of thelead? Assume led has a specific heat capacity of 160J/kg·K.
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 = 1
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 Feedback
1. Calculate the work done on the suitcase by F→. Express your answer with the appropriate units. 2. Calculate the work done on the suitcase by the gravitational force. Express your answer with the appropriate units. 3.Calculate the work done on the suitcase by the normal force. Express your answer with the appropriate units. 4. Calculate the work done on the suitcase by the friction force. Express your answer with the appropriate units. 5. Calculate the total work done on the suitcase. Express your answer with the appropriate units. 6. If the speed of the suitcase is zero at the bottom of the ramp, what is its speed after it has traveled 3.90 mm along the ramp? Express your answer with the appropriate units.
Part A A0.60 kg book slides on a horizontal table, The kinetic friction force on the book has magnitude 1.1 N. How much work is done on the book by friction during a displacement of 3.4 m to the left? Express your answer with the appropriate units. HẢ W = Value Units Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining Part B The book now slides 3.4 m to the right, returning to its starting point. During this second 3.4 m displacement, how much work is done on the book by friction? Expre your nswer with the appropria eunits. Ii HẢ W2 = Value Units Submit Request Answer Part C
(Figure 1) is the force-versus-position graph for a particle moving along the x-axis. Figure Fx (N) 4 2 0 -2 -4 1 2 3 -x (m) ▼ Part A Determine the work done on the particle during the interval 0-1 m. Express your answer with the appropriate units. Wo-1 = Units You have already submitted this answer. Enter a new answer. No credit lost. Try again. Submit Part B ΠΑ W1-2 = Submit Value Previous Answers Request Answer Determine the work done on the particle during the interval 1-2 m. Express your answer with the appropriate units. μA Value Units ? www Previous Answers Request Answer ? Units input for part B
Part G One common application of conservation of energy in mechanics is to determine the speed of an object. Although the simulation doesn't give the skater's speed, you can calculate it because the skater's kinetic energy is known at any location on the track. Consider again the case where the skater starts 7 m above the ground and skates down the track. What is the skater's speed when the skater is at the bottom of the track? Express your answer numerically in meters per second to two significant figures. View Available Hint(s) 跖 ΑΣΦ Submit ? m/s
A loaded grocery cart is rolling across a parking lot in a strong wind. You apply a constant force F = (34 N)i – (39 N)j to the cart as it undergoes a displacement 3 = (-9.1 m)î – (4.0 m)j. Part A How much work does the force you apply do on the grocery cart? Express your answer in joules. DA ΑΣφ W = J %D
Part A The two ropes seen in (Figure 1) are used to lower a 255 kg piano exactly 8 m from a second-story window to the ground. How much work is done by w? Express your answer in joules. ν ΑΣφ ? W = J Submit Request Answer Part B How much work is done by T1? Express your answer in joules. ? W = J Submit Request Answer Part C How much work is done by T2 ? Express your answer in joules. ΑΣφ ? W = J Submit Request Answer Figure 1 of 1 Provide Feedback 1830 N 1295 N 60° 45° 2500 N
A 20.0-kg child descends a slide 1.80 m high and reaches the bottom with a speed of 1.25 m/s . Part A How much thermal energy due to friction was generated in this process? Express your answer to three significant figures and include the appropriate units.
Part A Suppose a box of mass m is being pulled across the ground with a horizontal force Fl = Ar?, where A is a constant, from the position z = 0 to z=d. Find an expression for the work done by Fpull on the box. Express your answer in terms of some, all, or none of the variables A and d. W = Submit Request Answer rovide Feedback Next> 31 O MAR 51 W X MacBook Air F10 F9 F6