College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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- 25. At time t = 0 a car has a velocity of 16 m/s. It slows down with an acceleration given by -0.50t, in m/s² for t in seconds. At the end of 4.0 s it has traveled: A. 0 В. 12 m С. 14 m D. 25 m E. 59 m ans: Earrow_forwardA motorist starts from rest and traveled as seen in the speed-time graph. The total distance traveled and the average velocity in m/s for the distance traveled is 1.5 3.0 4.5 6.0 7.5 Time in minutes Select one: O a. 7.5 km, 4.5 m/s b. 10 km, 1.5 m/s c. 4.5 km, 10 m/s Reply... Speed in km/h :arrow_forward26. At time t = 0 a car has a velocity of 16 m/s. It slows down with an acceleration given by -0.50t, in m/s² for t in seconds. By the time it stops it has traveled: A. 15 m В. 31 m С. 62 m D. 85 m Е. 100 m ans: Darrow_forward
- A car accelerates from rest for 6 seconds with a constant acceleration of 1.5 m/s?. Find the final velocity of the car. a. 9 m/s. b. 6 m/s. c. 1.5 m/s d. 3 m/s.arrow_forwardHicham El Guerrouj of Morocco holds the world record in the 1500 m running race. He ran the final 400 m in a time of 51.9 s. What was his average speed in mph over the last 400 m?A. 14.2 mph B. 15.5 mphC. 17.2 mph D. 23.9 mpharrow_forward7. A feather is dropped on the moon from a height of 1.40 meters. The acceleration of gravity on the moon is 1.67 m/s?. Determine the time for the feather to fall to the surface of the moon. a. 2.29 s b. 1.29 s. c. 1.29 m d. 0.29 s. a C darrow_forward
- A ball is dropped in a stationary elevator and hits the floor in 0.65 s. How long does it take for the ball to hit the floor if the elevator is moving down with a constant speed of 3.0 m/s. Consider g = 9.8 m/s². Select one: O a. 1.16 s O b. 1.02 s O c. 0.76 s O d. 0.84 sarrow_forwardA motorcyclist moving with an initial velocity of 8.0 m/s undergoes a constant acceleration for 3.0seconds, at which time his velocity are 17 m/s. Its acceleration is _____. a. 3.0 m/s b. 2.5 m/s c. 1.2 m/s d. 5.1 m/sarrow_forwardAn airplane needs to gain an acceleration of 0.79 m/s2 to take off on a 2000 m runway, what is the velocity ( i.e. final velocity) of the airplane just before it takes off? [Pay attention to the units in answer choices] A. 112 km/h B. 203 km/h C. 786 km/h D. 304 km/h Please explain step by step and the equations used, thank you.arrow_forward
- More people end up in U.S. emergency rooms because of fall-related injuries than from any other cause. At what speed v would someone hit the ground who accidentally steps off the top rung of a 4.0 m tall stepladder? a. 8.9 m/s b. 7.1 m/s c. 6.2 m/s d. 8.0 m/s e. 9.8 m/s A spring gun launches a heavy steel marble with an initial speed of 19.6 m/s. How long will the steel marble be in the air? a. 6.0 s b. 2.0 s c. 3.0 s d. 5.0 s e. 4.0 s A car is traveling in a straight line along a straight, level road at 15.0 m/s when it uniformly accelerates at 3.00 m/s2 for a time of 6.00 s. How far does the car travel in this time? a. 90 m b. 54 m c. 126 m d. 162 m e. 144 marrow_forward9. A car with its brakes applied has an acceleration of -1.2 m/s˄2. If its initial velocity is 10 m/s, the distance the car covers in the first 5 seconds after the acceleration begins is A. 15 m B. 32 m C. 35 m D. 47 m 12. A train starting at 30 km/h travels a distance of 21 km in 18 min. Determine the acceleration of the train at this instant. A. 0.0865 m/s˄2 B. 0.0206 m/s˄2 C. 0.3820 m/s˄2 D. 0.0043 m/s˄2 13A stone is dropped from a cliff. After it has fallen 30 m, the magnitude of its velocity is approximately A. 17 m/s B. 24 m/s C. 44 m/s D. 588 m/s Answer the following, i only need the letter of correct answer.arrow_forwardA car is moving along a straight road with an initial velocity of v, =13 m/s and an acceleration, a=2 m/s2. What is the distance traveled (in m) after t=4 s? A. None B. 204 C. 136 D. 68 E. 272 OUOD Oarrow_forward
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