21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 3, Problem 25QP
To determine
Explain the difference between speed and velocity; velocity and acceleration.
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What is the average acceleration in m/s? of a moving car with an initial velocity of 12.5m/s
and having a final velocity of 25 m/s in a period of 6 minutes?
What is the average velocity in m/s of a moving pulley that starts with 10km marks to 15 km
in a period of 5 minutes?
A jet plane has a takeoff speed of v 66 m/s and can move along the runway at an average acceleration of 1.9 m/s. If the length of the runway is 2.9 km, will the plane be able to use this runway
safely?
O Yes
O No
Defend your answer.
What do you understand by an acceleration of +2m/s?? of - 2 m/s??
Chapter 3 Solutions
21st Century Astronomy
Ch. 3.1 - Prob. 3.1ACYUCh. 3.1 - Prob. 3.1BCYUCh. 3.2 - Prob. 3.2CYUCh. 3.3 - Prob. 3.3CYUCh. 3.4 - Prob. 3.4CYUCh. 3 - Prob. 1QPCh. 3 - Prob. 2QPCh. 3 - Prob. 3QPCh. 3 - Prob. 4QPCh. 3 - Prob. 5QP
Ch. 3 - Prob. 6QPCh. 3 - Prob. 7QPCh. 3 - Prob. 8QPCh. 3 - Prob. 9QPCh. 3 - Prob. 10QPCh. 3 - Prob. 11QPCh. 3 - Prob. 12QPCh. 3 - Prob. 13QPCh. 3 - Prob. 14QPCh. 3 - Prob. 15QPCh. 3 - Prob. 16QPCh. 3 - Prob. 17QPCh. 3 - Prob. 18QPCh. 3 - Prob. 19QPCh. 3 - Prob. 20QPCh. 3 - Prob. 21QPCh. 3 - Prob. 22QPCh. 3 - Prob. 23QPCh. 3 - Prob. 24QPCh. 3 - Prob. 25QPCh. 3 - Prob. 26QPCh. 3 - Prob. 27QPCh. 3 - Prob. 28QPCh. 3 - Prob. 29QPCh. 3 - Prob. 30QPCh. 3 - Prob. 31QPCh. 3 - Prob. 32QPCh. 3 - Prob. 33QPCh. 3 - Prob. 34QPCh. 3 - Prob. 35QPCh. 3 - Prob. 36QPCh. 3 - Prob. 37QPCh. 3 - Prob. 38QPCh. 3 - Prob. 39QPCh. 3 - Prob. 40QPCh. 3 - Prob. 41QPCh. 3 - Prob. 42QPCh. 3 - Prob. 43QPCh. 3 - Prob. 44QPCh. 3 - Prob. 45QP
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- Do highway speed limit signs refer to average speeds or to instantaneous speeds? Explain.arrow_forwardWhat is the acceleration of a rock thrown straight upward on the way up? At the top of its flight? On the way down?arrow_forwardA jet plane has a takeoff speed of vto = 72 m/s and can move along the runway at an average acceleration of 1.7 m/s2. If the length of the runway is 1.4 km, will the plane be able to use this runway safely? O Yes O No Defend your answer.arrow_forward
- “Velocity” and “speed” are used interchangeably in everyday language, but they have distinct definitions in physics. Why?arrow_forwardA jet plane has a takeoff speed of ? = 75 m/s and can move along the runway at an average acceleration of 1.3 m/s2. If the length of the runway is 2.5 km, will the plane be able to use this runway safely? Defend your answer.arrow_forwardRattlesnake are amazing critters. When striking at a victim they can accelerate at 50m/s2. If a large object like a car could do the same, how much time would it take to reach a speed of 120km/h from rest?arrow_forward
- Walk along a long straight level path in the woods you go 30 m in 6.2 s, stop for 32 s, and then continue on in the same direction 40 m more in 15 s. What was your average speed for all of this?arrow_forwardYou drop a rock off the top of a 60 m tall cliff. How long does it take for it to hit the ground? (Ignore air resistance)arrow_forwardWhat is the physical significance of the signs? Is a positive acceleration always speeding up? What is happening when velocity and acceleration have different signs?arrow_forward
- From the top of a tall building, you throw one ball straight up with speed and one ball straight down with speed. Which ball has the greater speed when it reaches the ground? Which ball gets to the ground first? Which ball has a greater displacement when it reaches the ground? Which ball has traveled the greater distance when it hits the ground? Justify your answers.arrow_forwardA fullback is running down the football field in a straight line. He starts at the 0-yard line at 0 seconds. At 1 second, he is on the 10-yard line; at 2 seconds, he is on the 20-yard line; at 3 seconds, he is on the 30-yard line; and at 4 seconds, he is on the 40-yard line. What is the player's acceleration?arrow_forwardThe velocity of an object falling in free fall increases with time. Does the acceleration also increase? Why or why not?arrow_forward
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