Question 8) Regis goes to the water slides at an amusement park on a hot summer day. He approaches a loop with a velocity of 12.0 m/s. The loop has a diameter of 5.00 m. He has a mass of 100 kg. Frictional forces are negligible in this system. Does Regis have sufficient mechanical energy to travel through the loop? v = 12.0 m/s 5 m 100 kg
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- 2 W S X In a hydroelectric dam, water falls 35 m and then spins a turbine to generate electricity. 3 E D 80 C $ 4 R 888 F V 96 5 T G ^ 6 B ▾ Part A What is AU of 1.0 kg of water? Express your answer with the appropriate units. View Available Hint(s) AU= -340 J Y Submit ▾ Part B ✓ Correct SOLVE: The change in the potential energy of 1.0 kg of water in falling 35 m m is H Suppose the dam is 80% efficient at converting the water's potential energy to electrical energy. How many kilograms of water must pass through the turbines each second to generate 48 MW of electricity? This is a typical value for a small hydroelectric dam. Express your answer in kilograms per second. ▸ View Available Hint(s) m 11s AU, -mgh=-(1.0 kg) (9.8 m/s²) (35 m) = -340 J = = Provide Feedback Submit MacBook Air Previous Answers & 7 N IG] ΑΣΦ | 3-4 U * 8 D-H I M @ JK ( 9 MOSISO DD O I भ ? O L kg/s command F10 P > ; C option + ? T I Next > delete reA 2500-W electric motor raises a 500-kg sack from a height of 2.0 m to 24.0 m in 50 s. The efficiency of the motor is: 8.8 % O 40 % O 86 % O 0.42 % O 95 %The mass of an elevator cab, including passengers, is 3.1 x 103 kg. It moves 180 m up the elevator shaft in 21 s at constant speed. What is the average rate of work done by the cable on the elevator cab? Your answer should be in kJ/s (= kilowatts, abbreviated kW) Question Help: Read Submit Question kW
- A roller coaster of mass 500 kg is at its highest point in a loop traveling at a velocity of 4 m/s. The loop is 15 meters tall. Assuming 5 kJ of energy is lost between the highest and lowest point of the loop, how fast is the roller coaster traveling when it reaches the lowest point of the loop? 15.3 m/s 28 m/s O None 17.2 m/sA 2.35-kg object initially at rest has a gravitational potential energy of 74.6 J. Determine the speed of the object when it has moved under the influence of gravity to a location where its gravitational potential energy is 50.0 J. m/s? V m In the above image we see a 3.43 kg box that is moving to the right at 19.5 m/s. The box hits into a rough patch that applies a frictional force of 277 Newtons until the box comes to a stop. time K.E. E.P.E. Joules G.P.E. M.E Initial Joules Joules Joules Final Joules Joules Joules Joules How much work was done on the box by friction? Joules How far would the box travel before coming to a stop? meters
- A 5.74 kg object falls freely (ignore air resistance), after being dropped from rest. Determine the initial kinetic energy (in J), the final kinetic energy (in J), and the change in kinetic energy (in J) for the following. (a) the first meter of the fall initial kinetic energy final kinetic energy change in kinetic energy (b) the second meter of the fall initial kinetic energy final kinetic energy change in kinetic energy J J J J JThe driver of a 760.0 kg car decides to double the speed from 21.1 m/s to 42.2 m/s. What effect would this have on the amount of work required to stop the car, that is, on the kinetic energy of the car? KE x 105 J KE = × 105 J (select) v times as much work must be done to stop the car.An electric winch causes an elevator to move between floors of a ten-story building. The mass of the elevator with a maximum load of passengers is at most 500. kg. The elevator moves a speed of 0.304 m/s taking a time of 115.s to travel the distance of 35.0 m. What is the minimum power rating this winch would have? Select one: a. b. C. d. 1.49 x 10³ W 1.30 x 10¹ W 4.90 x 10³ W 1.72 x 105 W