2) A police car signals a motorcycle 100m meters away to stop. Since the motorcycle did not stop, after 3s the police car starts chasing the motorcycle with constant acceleration as shown above. After 9s they slow down until they come to a stop. v(m/s) police car motocycle 20m/s 3s 5s 9s 15s t(s) a) Find the acceleration of the police car b) Show that the speed of the police car at 9s is 60m/s c) Show that after 9s the police car is again 100m away from the motorcycle d) Find the average speed of the police car e) Find the final distance between the police car and motorcycle after 15s

2) A police car signals a motorcycle 100m meters away to stop. Since the motorcycle did not stop, after 3s the police car starts chasing the motorcycle with constant acceleration as shown above. After 9s they slow down until they come to a stop. v(m/s) police car motocycle 20m/s 3s 5s 9s 15s t(s) a) Find the acceleration of the police car b) Show that the speed of the police car at 9s is 60m/s c) Show that after 9s the police car is again 100m away from the motorcycle d) Find the average speed of the police car e) Find the final distance between the police car and motorcycle after 15s

Name: 2) A police car signals a motorcycle 100m meters away to stop. Since
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Description: 2) A police car signals a motorcycle 100m meters away to stop. Since the motorcycle didnot stop, after 3s the police car starts chasing the motorcycle with constantacceleration as shown above. After 9s they slow down until they come to a stop.v(m/s)

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter3: Two-dimensional Kinematics

Section: Chapter Questions

Problem 65PE: An athlete crosses a 25-m-wide river by swimming perpendicular to the water current at a speed of...

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An athlete crosses a 25-m-wide river by swimming perpendicular to the water current at a speed of 0.5 m/s relative to the water. He reaches the opposite side at a distance 40 m downstream from his starting point. How fast is the water in the river flowing with respect to the ground? What is the speed of the swimmer with respect to a friend at rest on the ground?
A seagull flies at a velocity of 9.00 m/s straight into the wind. (a) If it takes the bird 20.0 min to travel 6.00 km relative to the Earth, what is the velocity of the wind? (b) If the bird turns around and flies with the wind, how long will he take to return 6.00 km? (c) Discuss how the wind affects the total round-trip time compared to what it would be with no wind.
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What is the speed of the bird in Exercise 2.4?
You are arguing over a cell phone while trailing an unmarked police car by 25m; both your car and the police car are travelling at 120km/h. Your argument diverts your attention from the police car for 2.0s (long enough for you to look at the phone and yell, “I won’t do that!”). At the beginning of that 2.0s, the police officer begins braking suddenly at 5.05m/s^2. What is the separation between the two cars when your attention finally returns? Suppose that you take another 0.500s to realize your danger and begin braking. If you too brake at 5.05 m/s^2, what is your speed when you hit the police car?
In his novel From the Earth to the Moon (1865), JulesVerne describes a spaceship that is blasted out of a cannon, calledthe Columbiad, with a speed of 12,000 yards>s. The Columbiad is900 ft long, but part of it is packed with explosives, so the spaceship accelerates over a distance of only 700 ft. Estimate the acceleration experienced by the occupants of the spaceship duringlaunch. Give your answer in m>s2. (Verne realized that the “travelers would . . . encounter a violent recoil,” but he probably didn’tknow that people generally lose consciousness if they experienceaccelerations greater than about 7g ∙ 70 m>s2.)
You are driving your car uphill along a straight road. Of Suddenly, you see a car go through a red light and enter the intersection, just ahead of you. you. You immediately apply your brakes and skid straight to a stop, leaving a 100 ft long mark from the landslide. A policeman observes the whole incident, give the driver of the car a ticket for running a red light. He also gives a ticket to you for exceeding the 30 mph speed limit. When you get home, you read your physics book and you may notice that the coefficient of kinetic friction between the tires and the road was 0.60, and the coefficient of static friction was 0.80. You estimate that the hill makes an angle of about 10° with the horizontal. Check the manual owner and find that your car weighs 2,050 lbs. Are you going to claim the traffic ticket? in the court? Support your argument. Please type answer not write by hend
Brynn, who is standing on her balcony, is surprised by a pigeon and throws a flowerpotup in the air at 2.1 m/s. It takes 3.0 s for the flowerpot to smash to the ground. The flowerpotexperiences acceleration due to gravity of 9.81 m/s2 [down]. Determine how high Brynn’sbalcony from the ground, and how fast the flowerpot was moving just before it smashed tothe ground A water balloon is fired at 34.0 m/s from a water cannon, which is aimed at an angle of18° above the ground. The centre of the cannon’s target (which has a radius of 1.0 m) ispainted on the asphalt 42.0 m away from the water cannon.Will the balloon hit the target? Justify your response with calculations that indicate where thewater balloon will land and make one suggestion about how to adjust the water cannon sothat the water balloon will hit the target.
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A thief in a stolen car through a police check post at his top speed of 90 km/h. A motorcycle, reacting after 2 sec, accelerates from rest at 5 m/s2. His top speed being 108 km/h. Find the maximum separation between policemen and thief.
6.) Suppose a car is travelling at 20.0 m/s and the driver sees a traffic light turns red. After 0.53 seconds has elapsed, the driver applies the brakes and the car decelerates at 7.0 m/second square. What is the stopping distance (meter) of the car, as measured from the point where the driver first notices the red light?
A motorist travels at a constant speed of 39.0 m/s through a school zone; exceeding the posted speed limit. A policeman stopped at the side of the road gives chase. 7.0 s after the speeding car passes, the police cruiser begins to accelerate at a constant rate of 3.5 m/s2. How much time elapses between the moment the speeder passes the policeman and the policeman catches the speeder?