# SC PHYS 201 - Final Exam Study Guide (12 pages)

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## Final Exam Study Guide

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- Pages:
- 12
- Type:
- Study Guide
- School:
- University Of South Carolina-Columbia
- Course:
- Phys 201 - General Physics I
- Edition:
- 1

**Unformatted text preview: **

Phys 201 1st Edition Final Exam Study Guide Lectures 1 24 Lecture 1 August 27th A commuting student leaves home and drives to school at an average speed of 40 0 km h After 20 0 min he realizes that he has forgotten his homework and returns home to get it at the same average speed It takes 9 0 min to find the report after which the trip to school 40 0 km away to the east is resumed at the same speed as before a What is the average speed for the entire trip b What is the average velocity for the entire trip Answer a 10 2m s b 6 12 m s Explanation The first thing we need to do is convert km h into m s for all variables 40km h 1000 3600m s 11 11m s 20 minutes 1200s 9 minutes 540s 40km 40000m a The speed is the total distance divided by time To find the total distance we add the first trip towards the school the trip back home and the last trip to the school 11 11m s 1200s 13332m 13332 2 26664m Total distance 26664m 40000m 66664m To get the speed we divided this distance by the total time traveled To get the total time we need to add the 20 minutes of the first two trips the 9 minutes spend at home and the hour to get back to school 66664m 1200s 1200s 540s 3600s 10 19m s b Velocity is the change in distance or displacement over the total time This means that we only need to consider the distance from the house to the school divided by the total time 40000m 1200s 1200s 540s 3600s 6 116m s Lecture 2 September 3rd A cannonball is dropped from the top of a building If the point of release is 42 6 m above the ground what is the speed of the cannonball just before it strikes the ground Answer 28 9m s Explanation Because the ball is dropping straight down it has a constant gravitational acceleration of 9 81m s2 Also the initial velocity of the ball at the top of the building is 0m s Therefore to find the final velocity speed of the cannon ball we use the following equations X V0t 5at2 V V0 at We use the first equation to solve for time which we then plug into the second

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