22. A helicopter (m 1,250 kg) is cruising at a speed of 35 m/s at an altitude of

Question

22. A helicopter (m 1,250 kg) is cruising at a speed of 35 m/s at an altitude of 850 m. = What is the total mechanical energy of the helicopter, relative to the ground? a) 0.77 MJ b) 1.2 MJ c) 7.7 MJ d) 9.0 MJ e) 11.2 MJ 23. A.065 kg tennis ball moving to the right with a speed of 40 m/s is struck by a tennis racket, d of 50 m/s. If the ball remains in contact with the causing it to move to the left with a spee racket for 025 sec, what is the magnitude of the average force experienced by the ball? ce) 234 N ad) 52 N be) 4,000N ac) 208 N be) .104 N 24. During hockey practice, two pucks are sliding across the ice in the same direction. At one instant .14 kg puck is moving at 45 m/s while the other puck has a mass of.18 kg & a speed of 27 m/s What is the velocity of the center of mass of the two pucks? a) 11.9 m/s b) 37.1 m/s c) 11.2 m/s d) 34.9 m/s e) 233.3 m/s

Explanation / Answer

22)

Total mechanical energy of the helicopter is the sum of kinetic and potential energy

W = Wk + Wp

W = mV^2/2 + mgh

W = (1250 x 35 x 35) / 2 + (1250 x 9.8 x 850)

W = 1531250 + 10412500

W = 11.94375 MJ

Ans :- e) 11.2 MJ

23)

a change in momentum equals an impulse

mv = Ft

F = mv / t

F = m(vf - vi) / (tf - ti)

F = 0.065(-50 - 40) / (0 - 0.025 )

F = 234 N

24)

Vcm = mAvA + mBvB / (mA + mB)

Vcm = (0.14 x 45 + 0.18 x 27) / (0.14 + 0.18)

Vcm = 34.857 m/s

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