Number 23 16:1422. An object with a mass of 25 kg is falling in air and experiences a force due to air resistance of 42 N.What is the net force acting on the object and at what rate is it accelerating toward the ground?23. A cannon is fired over level ground at an angle of 25° to the horizontal. The initial velocity of thecannonball is 120 m/s. How long is the cannonball in the air? How far does the cannonball travelhorizontally?

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23. A cannon is fired over level ground at an angle of 25° to the horizontal. The initial velocity of the cannonball is 120 m/s. How long is the cannonball in the air? How far does the cannonball travel horizontally?

23. A cannon is fired over level ground at an angle of 25° to the horizontal. The initial velocity of the cannonball is 120 m/s. How long is the cannonball in the air? How far does the cannonball travel horizontally?

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter6: Motion In Two Dimensions

Section6.3: Relative Velocity

Problem 27PP

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.

Question

Number 23

16:14
22. An object with a mass of 25 kg is falling in air and experiences a force due to air resistance of 42 N.
What is the net force acting on the object and at what rate is it accelerating toward the ground?
23. A cannon is fired over level ground at an angle of 25° to the horizontal. The initial velocity of the
cannonball is 120 m/s. How long is the cannonball in the air? How far does the cannonball travel
horizontally?

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