Practice Homework 2

# Practice Homework 2 - practice 02 ALIBHAI ZAHID Latest...

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practice 02 – ALIBHAI, ZAHID 1 Latest unpenalized work: Jan 29 2007 Mon- day 04:00 (after this date you can not make a perfect score). Work cutoff: Jan 28 2007, 4:00 am. Question 1 part 1 of 2 10 points A person travels by car from one city to another. She drives for 31 . 2 min at 69 . 8 km / h, 8 . 5 min at 112 km / h, 47 . 4 min at 42 . 3 km / h, and spends 16 . 5 min along the way eating lunch and buying gas. Determine the distance between the cities along this route. Answer in units of km. Question 2 part 2 of 2 10 points Determine the average speed for the trip. Answer in units of km / h. Question 3 part 1 of 2 10 points A runner is jogging at a steady v r = 5 . 1 km / hr. When the runner is L = 6 . 8 km from the finish line a bird begins flying from the runner to the finish line at v b = 30 . 6 km / hr (6 times as fast as the runner). When the bird reaches the finish line, it turns around and flies back to the runner. Even though the bird is a dodo, we will assume that it occupies only one point in space, i.e. , a zero length bird. L v b v r finish line How far does the bird travel? Answer in units of km. Question 4 part 2 of 2 10 points After this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. The bird repeats the back and forth trips until the runner reaches the finish line. How far does the bird travel from the be- ginning? ( i.e. , include the distance traveled to the first encounter) Answer in units of km. Question 5 part 1 of 1 10 points Identify all of those graphs that represent motion at constant speed (note the axes care- fully). a) t x b) t v c) t a d) t v e) t a 1. (a) only 2. None of these

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practice 02 – ALIBHAI, ZAHID 2 3. (e) only 4. (a), (b), and (d) 5. (a), (b), and (e) 6. (a) and (d) 7. (a), (b), and (c) 8. (c) only 9. (a) and (c) 10. (d) only Question 6 part 1 of 2 10 points The velocity of a particle moving along the x axis varies in time according to the expres- sion v ( t ) = ( α - β t 2 ) where α = 59 . 4 m / s, β = 4 . 09 m / s 3 , and t is in seconds. Find the average acceleration in the time interval from t = 0 to 3 . 23 s. Answer in units of m / s 2 . Question 7 part 2 of 2 10 points Determine the acceleration of the particle at t f = 3 . 23 s.
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