2- Which of the following could not be the power coefficient of a slow speed wind turbine? a. 0.3396 b. 0.265 c. 0.444 d. 0.327
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2-
Which of the following could not be the power coefficient of a slow speed wind turbine?
0.3396
0.265
0.444
0.327

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- If the speed of a particle is doubled, what happens to its kinetic energy? a. It will be half. b. It will be square root of twice as large. c. It will be four times bigger. d. It does not change e. It will be twice as big.3 A child of mass 20 kg on a swing hanging from a 3.0m chain is pulled by her uncle until the swing is at an angle of 30 degrees to the vertical. a) How much farther from the ground is the child now, compared to when the swing was hanging straight down? b) Since the child is motionless at he beginning and the end of the process, what can you say about the work done by gravity, and the work done by the puller on the child during the pullback? What is the amount of work her uncle does to pull back the swing? c) If he lets the swing go at this point, what is the child's speed as she passes the lowest point of the swing & the chain is vertical? Ignore the mass of the swing seat & chain.Positive work W done on a system means a. Energy is transferred out of the system b. Energy can change from one form into another c. Energy is transferred into the system d. Total energy of the system is zero
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- Which one of the following is equivalent to a watt? O a. N.m2 O b. N.m O c. J.s O d. N.m.s140.) Power is the rate at which energy is transferred. work is the process of transferring energy from one object to the other. a. true b. false5. Two people of the same mass climb the same set of stairs. Person A climbs the stairs in 25 s. Person B dimbs the stairs in 35 s. Which person does the most work? Explain your answer a. b. Which person produces more power? Explain your answer 930 KB
- 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 youA car is accelerated from velocity v1 to v2 in the time period of t . The mass of the car is m. The inclined angle of the hill is α. The distance travelled along the hill is L. The vertical distance travelled is H. Select the equation used to calculate the potential energy increase of the car ΔPE______ A. B. ΔPE=mgH C. ΔPE=mgL D.2. Mikey sees that the right front tire (m 30.0 kg) of Granny's car has landed in front of him. He picks it up and runs for 40 m at a constant velocity of 2.0 m/s to return it to her. How much work did Mikey do on the tire from 10 m to 20 m into his run? =