28) A karate chop delivers a blow of 3000 N to a board that breaks. The force th

Question

28) A karate chop delivers a blow of 3000 N to a board that breaks. The force that acts on the hand during this event is A) zero. B) 1500 N. C) 3000 N. D) 6000 N. 29) A car is being pushed by two forces: one towards the north with magnitude of 1000 N and the other towards the east with magnitude of 1000 N. the magnitude of the net force acting on the car is: A) 1414 N. B) 2000 N. C) 1000 N. D) 0. 30) An airplane is flying at a speed of 200 km/h towards the north in a cross wind that is directed towards the east. The speed of the wind is 60 km/h. the speed and direction of the airplane as seen by an observer on the ground is: A) 260 km /b in the east-of-north direction. B) 200 km/h in the east-of-north direction. C) 9 km/h in the east-of-north direction. D) 20 km/h in the east-of-north direction.

Explanation / Answer

1) C 3000N   as every action has an equal and opposite reaction

2) A 1414N   as magnitude = sqrt(1000*1000+1000*1000) = 1414

3) direction = tan-1(60/200) = 17 degrees east of north

magnitude = 209km/h

hence option C

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