9. While traveling in your shiny new BMW Z4, you spot a police officer. You brake the car from 75 km/h to 45 km/h over a distance of 88 m. Va) What is the acceleration, assuming it is constant. b) What is the elapsed time of breaking? c) If you continue to slow the car down to a stop with the same constant acceleration as in part a, how long, in total, is required to bring the car to a stop from 75 km/h? d) In the case of part c, how far did the car travel while breaking? b) 5.29 s c) 138 m d) 13.2s Answers: a) –1.57 m/s 10. A rock is dropped from a cliff 100 m above a canyon floor. a) How long does it take the rock to drop the first 50 m? b) How long does it take the rock to drop the last 50 m?
9. While traveling in your shiny new BMW Z4, you spot a police officer. You brake the car from 75 km/h to 45 km/h over a distance of 88 m. Va) What is the acceleration, assuming it is constant. b) What is the elapsed time of breaking? c) If you continue to slow the car down to a stop with the same constant acceleration as in part a, how long, in total, is required to bring the car to a stop from 75 km/h? d) In the case of part c, how far did the car travel while breaking? b) 5.29 s c) 138 m d) 13.2s Answers: a) –1.57 m/s 10. A rock is dropped from a cliff 100 m above a canyon floor. a) How long does it take the rock to drop the first 50 m? b) How long does it take the rock to drop the last 50 m?
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Please solve 9c and 9d. Please solve 10 too
The acceleration was -1.57 m/s^2.
Transcribed Image Text:**Physics Problem Set**
1. **Train Braking Problem:**
Two trains, each traveling at 120 km/h, see one another and apply the brakes at the same time.
- **a)** How long does it take for each train to stop?
- **b)** How far does each train travel once braking starts before coming to rest?
- **Answer:** a) 6.10 s b) 91.5 m
2. **Train Collision Problem:**
Two trains are traveling towards each other, train 1 at 72 km/h and train 2 at 120 km/h. If brakes are applied at a rate of 1.1 m/s², will the trains collide?
- **Answer:** No, they stop 194 m apart.
3. **Raindrop Problem:**
Raindrops fall from 1700 m above Earth's surface. If air resistance is ignored, how fast would they be traveling when they struck the surface?
- **Answer:** 182 m/s
4. **Boy on a Bridge Problem:**
A boy on a bridge 50 m above a lake drops a rock, aiming to hit a boat 15 m from a point directly below him. Calculate the velocity needed.
- **Answer:** 4.7 m/s
5. **Ball Trajectory Problem:**
A ball is thrown upward with a velocity of 10 m/s.
- **a)** How long to reach its highest point?
- **b)** What is the maximum height?
- **c)** Time to reach 3.0 m above release point? (Note: ball at this height twice)
- **Answers:** a) 1.02 s b) 5.10 m c) {0.336 s, 1.67 s}
6. **Car Braking Problem:**
A BMW Z4 traveling at 75 km/h spots a police officer and brakes.
- **a)** Determine acceleration.
- **b)** Elapsed time for braking?
- **c)** Time to stop from 75 km/h with same acceleration?
- **d)** How far does the car travel while braking?
- **Answers:** a) -1.57 m/s² b) 5.29 s c) 13.2 s d) 138 m
7. **Rock Drop Problem:**
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