A pair of equal-length vectors at right angles to each other have a resultant. I

Question

A pair of equal-length vectors at right angles to each other have a resultant. If the angle between the vectors is greater than 90 degree, their resultant is A) greater. B) less. C the same. When a tennis racquet hits a ball. A) the racquet loses as much speed as the ball gains. B) the ball is set in motion with the same speed of the racquet upon contact. C) the ball hits the racquet. D) all of the above An airplane that flies at 100 km/h in a 100-km/h crosswind has a ground speed of A) 141 km/h. B) 200 km/h. C) 0 km/h. D) 100 km/h.

Explanation / Answer

28) less than the 90 degrees

29) the roqute looses spped and ball gets the much speed

30) sqrt(100^2+100^2) = sqrt(2)*100 = 141.4 km/h

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