Answered: VE rE N N W W E S P S P a b Figure 4.22…

VE rE N N W W E S P S P a b Figure 4.22 (Example 4.8) (a) A boat aims directly across a river and ends up downstream. (b) To move directly across the river, the boat must aim upstream.

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 59P: Aaron Rodgers throws a football at 20.0 m/s to his wide receiver, who runs straight down the field...

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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

A boat crossing a wide river moves with a speed of 10.0 km/h relative to the water. The water in the river has a uniform speed of 5.00 km/h due east relative to the Earth.
(A) If the boat heads due north, determine the velocity of the boat relative to an observer standing on either bank. (B) If the boat travels with the same speed of 10.0 km/h relative to the river and is to travel due north as shown part B, what should its heading be?

VE
rE
N
N
W
W
E
S P
S
P
a
b
Figure 4.22 (Example 4.8) (a) A boat aims directly across a
river and ends up downstream. (b) To move directly across the
river, the boat must aim upstream.

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