1. (1) What must be your car's average speed in order to travel 235 km in 3.25 h? 2. (I) A bird can fly 25 km/h. How long does it take to fly 15 km? 3. (I) If you are driving 110 km/h along a straight road and you look to the side for 2.0 s, how far do you travel during

1. (1) What must be your car's average speed in order to travel 235 km in 3.25 h? 2. (I) A bird can fly 25 km/h. How long does it take to fly 15 km? 3. (I) If you are driving 110 km/h along a straight road and you look to the side for 2.0 s, how far do you travel during

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter2: Kinematics

Section: Chapter Questions

Problem 34PE: In World War II, there were several reported cases of airmen who jumped from their flaming airplanes...

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Concept explainers

Distance and Speed

The speed, distance and time relation forms the basis of study of motion. You will need these concepts in the study of Mechanics. This concept is applicable for students who are studying the following courses –

Question

1. (I) What must be your car's average speed in order to
travel 235 km in 3.25 h?
2. (I) A bird can fly 25 km/h. How long does it take to fly
15 km?
3. (I) If you are driving 110 km/h along a straight road and
you look to the side for 2.0 s, how far do you travel during

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2. A motorist saw a humps 33 m away at a speed of 14.5 m/s. He immediately slams on the brake and decelerates 1.2 m/s 2 with a speed of 11.7 m/s. (a) Will he stop before the humps (express your answer in magnitude)? (b) How long it will take before stopping?
5) An object falls from a building which is 1200 meters high. How long before it hits the ground if it has a constant acceleration of 9.8 m/s2 downward? 7) A boat moves at 1.5 m/s. It then accelerates at 2.40 m/s2. How fast is the boat moving 5.00 seconds after it started to accelerate?
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. 37) A cheetah can accelerate from rest to a speed of 30.0 m/s in 7.00 s. What is its acceleration?
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4. A tourist throws a rock with an initial velocity of 8.0 m/s [down] from a scenic overlook into the Grand Canyon. What is the velocity and the displacement of the rock at a) 2.0 s? b) 6.0 s? 5. A boy throws a rock into a 10.0 m deep well at 4.00 m/s [down]. a) What is the velocity of the rock when it hits the bottom of the well? b) How long will it take to hit the bottom of the well? to tal disdaces 6. A flowerpot drops off the roof of a tall building. a) What is the velocity of the flowerpot at the end of 3.00 seconds of its fall? b) What is the velocity at the end of 4.00 seconds of its fall? c) What is the average velocity for the fourth second of the fall? d) What is the distance travelled during the fourth second? Vaug= 7. Two stones are dropped 1.00 s apart. How far apart are the two stones by the time the first one has reached a speed of 14.7 m/s?