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College Physics (Urone)
Found in: Page 79
College Physics (Urone)

College Physics (Urone)

Book edition 1st Edition
Author(s) Paul Peter Urone
Pages 1272 pages
ISBN 9781938168000

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Short Answer

What is the speed of the bird in Exercise 2.4.

In the above question speed of the bird will be 10 m/s.

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Step by Step Solution

TABLE OF CONTENTS :
TABLE OF CONTENTS

Step 1: Speed and Velocity

Speed is expressed as the ratio of a body's distance traveled divided by the time it took to cover the distance.

The speed is almost always expressed in meter per second (m/s).

The concept of speed is that it is a scalar quantity. As a result, just the magnitude is required to describe speed. There is no need for guidance.

Velocity is the ratio of a body's displacement to the time it takes to complete that dislocation.

The quantity of velocity is a vector quantity. It is critical to provide both magnitude and the direction with the magnitude. It also uses the same SI unit; however, it requires direction.

Step 2: Speed of the bird

The negative sign shows the direction of the bird velocity in the preceding sentence, "A bird diving for prey has a speed of 10 m/s ." As a result, a vector quantity is defined as one that possesses both magnitude and direction. In that case, the speed of the bird will be only 10 m/s.

Therefore, it is concluded that the speed of the bird is 10 m/s .

Most popular questions for Physics Textbooks

a) A light-rail commuter train accelerates at a rate of \({\bf{1}}{\bf{.35}}\;{\bf{m/}}{{\bf{s}}^{\bf{2}}}\). How long does it take to reach its top speed of 80.0 km/h, starting from rest? (b) The same train ordinarily decelerates at a rate of \({\bf{1}}{\bf{.65}}\;{\bf{m/}}{{\bf{s}}^{\bf{2}}}\). How long does it take to come to a stop from its top speed? (c) In emergencies the train can decelerate more rapidly, coming to rest from 80.0 km/h in 8.30 s. What is its emergency deceleration in \({\bf{m/}}{{\bf{s}}^{\bf{2}}}\)?

A rescue helicopter is hovering over a person whose boat has sunk. One of the rescuers throws a life preserver straight down to the victime with an initial velocity of and observes that it takes to reach the water.

(a) List the known in this problem.

(b) How high above the water was the preserver released? Note that the downdraft of the helicopter reduces the effects of air resistance on the falling life preserver, so that an acceleration equal to that of gravity is reasonable.

On May 26, 1934, a streamlined, stainless steel diesel train called the Zephyr set the world’s nonstop long-distance speed record for trains. Its run from Denver to Chicago took 13 hours, 4 minutes, 58 seconds , and was witnessed by more than a million people along the route. The total distance travelled was 1633.8 km. What was its average speed in km/hand m/s?

In World War II, there were several reported cases of airmen who jumped from their flaming airplanes with no parachute to escape certain death. Some fell about 20,000 feet (6000m), and some of them survived, with few life-threatening injuries. For these lucky pilots, the tree branches and snow drifts on the ground allowed their deceleration to be relatively small. If we assume that a pilot’s speed upon impact was 123 mph (54 m/s), then what was his deceleration? Assume that the trees and snow stopped him over a distance of 3.0m.

A soft tennis ball is dropped onto a hard floor from a height of \[{\bf{1}}.{\bf{50}}{\rm{ }}{\bf{m}}\] and rebounds to a height of\[{\bf{1}}.{\bf{10}}{\rm{ }}{\bf{m}}\]. (a) Calculate its velocity just before it strikes the floor. (b) Calculate its velocity just after it leaves the floor on its way back up. (c) Calculate its acceleration during contact with the floor if that contact lasts\[{\bf{3}}.{\bf{50}}{\rm{ }}{\bf{ms}}{\rm{ }}\left( {{\bf{3}}.{\bf{50}} \times {\bf{1}}{{\bf{0}}^{ - {\bf{3}}}}{\bf{s}}} \right)\]. (d) How much did the ball compress during its collision with the floor, assuming the floor is absolutely rigid?
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