Ex4: The Top Thrill Dragster is one of the tallest roller coaster in the world. The car is accelerated along a level track until they take a 90 vertical turn and travel to the peak, 120 m high. A typical fully loaded car has a mass of 2800 kg. 13+ AE, a) Calculate the minimum amount of work done on the car in order for it to reach the peak. ( 3. 24x 10'J 120m m = 2Bockg b) In reality the roller coaster is accelerated from 0 to 193 km/h in 3.8 s. Find the actual power input of the ride 3. 26X106 J c) Determine the efficiency of the ride from start to peak. . Ex5:Problem 1. AP 64KM 103 mm kim 76005 the Incredible Hulk roller coaster the car is initially launched up a hill 34 m igh, traveling from 0 to 64 km/h in 2.0 s. A full car has a mass of 4500 kg. 898 a) Find the power output of the ride. 1, 105x10 W KE + PE. = KEF + PEfault , myx2 + Angui = Lomvf 2 + mghe W = mah + imv ? P = 1450 0) ( 90) ( 34) + 1 (4500) (17.777) = b) The power consumption during the initial launch is actually 1.45 MW. Determine the efficiency of the ride during the initial launch.( 76 MunnsMOM -AMC 15c) If the car pulls in to the station at 8.0 m/s. How much heat has been generated? 21X10 65 d) The car is finally brought to rest over a distance of 2.0 m. How much force is required? +2,000 N4. A girl pulls a 5.0 kg wagon with a force of 20. N for 7.0 m. If the final speed of the wagon is 3.5 m/s, determine the efficiency of this process. 22 5. The graph shows the kinetic energy of a car as the 200 driver steps on the gas pedal. a) What is the power output of the car? 3300W 150 If the process is 30% efficient, determine the - Ex( K J ) power delivered to the car. 11 , DOO W 50 O 10 20 30 40 50 60 TIME (S) 6. The graph shows the power input for a 2.0 kg remote- controlled car starting from rest. 20 a) Determine the energy input. 350 J b) What is the final speed of the car if the remote- 15 controlled car is 20% efficient? ) 3Com 10 POWER ( W ) S 5 O 5 10 15 20 25 30 TIME (S)S 10/10) 100 15 =50 . . d (m) 2 2 5. A person pushes with 75 N on a lawnmower where the handle makes an angle of 20 with the horizontal and that has a mass of 25 kg. The surface has u = 0.21 and is 30 m in length. The mower starts at rest. Find the final speed of the lawnmower. (5.7 m/s)