An airplane heads due east at 110 m/s through a 25 m/s cross wind blowing from north to south. The resultant velocity of the airplane is a. 112.805 m/s, 12.80° east of south O b. 135 m/s, 12.80° south of east c. 85 m/s, 12.80° south of east O d. 112.805 m/s, 12.80° south of east

An airplane heads due east at 110 m/s through a 25 m/s cross wind blowing from north to south. The resultant velocity of the airplane is a. 112.805 m/s, 12.80° east of south O b. 135 m/s, 12.80° south of east c. 85 m/s, 12.80° south of east O d. 112.805 m/s, 12.80° south of east

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter4: Motion In Two And Three Dimensions

Section: Chapter Questions

Problem 76P: A small plane flies at 200 km/h in still air. If the wind blows directly out of the west at 50 km/h,...

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Concept explainers

Relative Velocity

It is a measurement of an object with regards to the other object which is moving or stable or stationary. For example, if we are traveling in a bus and the bus is moving at speed of 50km/hr, then our speed is according to the nearby passenger on the bus is zero. According to them, we are not moving. But if one person standing on the ground or road observes us from outside of the bus, according to him we are moving at a speed of 50km/hr and the bus is also moving at a speed of 50km/hr. Now, the motion is recognized by the observer, it depends on a frame of reference or observer. This is motion called relative motion.

Question

An airplane heads due east at 110 m/s through a 25
m/s cross wind blowing from north to south. The
resultant velocity of the airplane is
a. 112.805 m/s, 12.80° east of south
O b. 135 m/s, 12.80° south of east
c. 85 m/s, 12.80° south of east
O d. 112.805 m/s, 12.80° south of east

A car travelling at a speed of 60 km/h has a kinetic
energy of 200 kJ. If the speed of the car is
increased to 120 km/h, the kinetic energy of the
car will be
а. 200 kJ
O b.
b. 400 kJ
с. 100 kJ
O d. 800 kJ

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