T Not set A 42.1/100 G 3/8/201709:30 AM Gradebook Print Calculator Periodic Tabl
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T Not set A 42.1/100 G 3/8/201709:30 AM Gradebook Print Calculator Periodic Table Question 26 of 28 Sapling Learning An shows a 1239 kg car slowly pulling at constant speed a large passenger aiplane to demonstrate the power of its newly-designed 88.7-hp engine. During the the car passed spaced meters 14.3 seconds. The passenger plane being towed is a Boeing 707, with a total weight of 62.5 tons. Calculate the force that opposes the motion. Assume that the efficiency of the car is such that 22.0% of the engine power is available to propel the car forward. How much work is performed by the car on the airplane during this time? How much work is performed by the airplane on the car during this time? Previous 8 Give Up 8 Mew souton 2 check Answer Next 4Ext Resources You can chec You can view up on any qu you get it righ You lose 5 Oe Textbook o Help with Th Oweb Help & V Technical SupExplanation / Answer
P= 88.7 hp = 66143.6 W
efficiency is 0.22 only.
hence energy provided = 0.22 x 66143.6 x 14.3
= 208087.7 J
velocity of system is constant so net work done on system will be zero.
hence work done by engine - work done by friction = 0
208087.7 - (W_car + W_plane) = 0
Wc + Wp = 208087.7
total force x d = Wc + Wp
F (26 m) = 208087.7
F = 8003.4 N .............Ans
Ratio of Wc and Wp will be same as ratio of their masses.
Wp / Wc = 62500 / 1239 = 50.44
Wp = 50.44 Wc
51.44 Wc = 208087.7
Wc = 4045 J
so Wp = 202027 J
Work performed by car on plane = 202027 J .........Ans
Work performed by plane on car = - 202027 J .........Ans
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