COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 2, Problem 73QAP
To determine
The person who will win the race.
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Find the final speed (in m/s) of the skier starting from rest.
Part (b) How long (in s) does it take for the skier to reach the bottom of this hill starting from rest?
•Part (c) Find the final speed (in m/s) of the skier starting with a speed of 2.50 m/s.
Part (d) How long (in s) does it take for the skier to reach the bottom of this hill with a starting speed of 2.50 m/s?
3. Another rocket lifts off and accelerates upward at a steady 3.30 m/s2• When it is 235 mabove the launch pad, it discards a used fuel canister. Once it is disconnected, the only forceacting on the canister is gravity (ignore air resistance).(a.} How high is the rocket when the canister hits the launch pad?(b.) What total distance did the canister travel between its release and its crash onto thelaunch pad?
2.6 .• A Honda Civic travels in a straight line along a road. Its
distance x from a stop sign is given as a function of time t by the
equation x(t) = at? – Bt, where a =
0.0500 m/s. Calculate the average velocity of the car for each
time interval: (a) t = 0 to t = 2.00 s; (b) t = 0 to t = 4.00 s;
(c) t = 2.00 s to t = 4.00 s.
1.50 m/s? and ß
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Chapter 2 Solutions
COLLEGE PHYSICS
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- •A bieyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the first part, she rides for 22 minutes at an average speed of 7.2 m/s. During the second part, she rides for 36 minutes at an average speed of 5.1 m/s. Finally, during the third part, she rides for 8.0 minutes at an average speed of 13 m/s. (a) How far has the bicyclist traveled during the entire trip? (b) What is her average velocity for the trip?arrow_forward2.9 .• A ball moves in a straight line (the x-axis). The graph in Fig. E2.9 shows this ball's velocity as a function of time. (a) What are the ball's average speed and average velocity during the first 3.0 s? (b) Suppose that the ball moved in such a way that the graph seg- ment after 2.0 s was – 3.0 m/s instead of +3.0 m/s. Find the ball's average speed and average velocity in this case. Figure E2.9 U, (m/s) 3.0 2.0 1.0 t (s) 3.0 1.0 2.0arrow_forwardSix baseball throws are shown below. In each case the baseball is thrown at the same initial speed and from the same height H above the ground. Assume that the effects of air resistance are negligible. Rank these throws according to the speed of the baseball the instant before it hits the ground. Rank from largest to smallest. To rank items as equivalent, overlap them. • View Available Hint(s) Reset Help A E H H H F largest smallestarrow_forward
- 2.45 • BIO The rocket-driven sled Sonic Wind No. 2, used for investigating the physiological effects of large accelerations, runs on a straight, level track 1070 m (3500 ft) long. Starting from rest, it can reach a speed of 224 m/s(500 mi/h) in 0.900 s. (a) Compute the acceleration in m/s?, assuming that it is constant. (b) What is the ratio of this acceleration to that of a freely falling body (g)? (c) What distance is covered in 0.900 s? (d) A magazine article states that at the end of a certain run, the speed of the sled de- creased from 283 m/s (632 mi/h) to zero in 1.40 s and that during this time the magnitude of the acceleration was greater than 40g. Are these figures consistent?arrow_forwardCan an object be increasing in speed as its acceleration decreases? If so, give an example. If not, explain.arrow_forward2.6 • A Honda Civic travels in a straight line along a road. Its distance x from a stop sign is given as a function of time t by the equation x(1) = at? – Bt³, where a = 1.50 m/s² and B = 0.0500 m/s. Calculate the average velocity of the car for each time interval: (a) t = 0 to t = 2.00 s; (b) t = 0 to t (c) t = 2.00 s to t = 4.00 s; 4.00 s.arrow_forward
- Q9. i) A ball is thrown vertically up with an initial velocity of 28 m/s. (a) How high will it reach (b) How much time it will take to reach the highest point (c) With what velocity it reaches the point from where it was thrown ii) Evaluate the simplest SI unit of K, if K = m²x2arrow_forwardA bangus (milkfish) can attain a maximum swimming speed of 6.0 m/s. a). How high can bangus jump vertically out of the water at that speed? a) 1.84 m height above the waterb) 1.84 m height above the groundc) 2.84m the groundd) 2.85 m above the waterarrow_forward• 2. An arrow is shot upward from the top of a 740 ft building with an initial velocity of 68 ft/s. a. State the arrow's position function. b. State the velocity function. c. State the acceleration. d. Find the average velocity of the arrow between 2 and 4 seconds. e. Find the maximum height reached by the arrow, f. What is the instantaneous velocity and acceleration at 5 seconds. g. The time when its strikes the ground - h. The final velocity when it hits the ground. • i. The time and velocity when it passes 520 ft from the ground.arrow_forward
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