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78) A car is traveling north at 17.7 m/s. After 12 s its velocity is 14.1 m/s in the same direction. Find the magnitude and direction of the car's average acceleration. A) 2.7 m/s2, north B) 2.7 m/s2, south D) 0.30 m/s2, south C) 0.30 m/s2, north

78) A car is traveling north at 17.7 m/s. After 12 s its velocity is 14.1 m/s in the same direction. Find the magnitude and direction of the car's average acceleration. A) 2.7 m/s2, north B) 2.7 m/s2, south D) 0.30 m/s2, south C) 0.30 m/s2, north

College Physics
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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increase its speed from 100 m/s to 160 m/s? A) 0.25 s B) 0.058 s C) 17 s D) 4.0 s SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 77) The captain orders his starship to accelerate from rest at a rate of "1 g" (1 g = 9.8 m/s2). How many days does it take the starship to reach 10% the speed of light? (Light travels at 3.0 × 108 m/s.) MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 78) 76) A car is traveling north at 17.7 m/s. After 12 s its velocity is 14.1 m/s in the same direction. Find the magnitude and direction of the car's average acceleration. A) 2.7 m/s2, north B) 2.7 m/s2, south C) 0.30 m/s2, north D) 0.30 m/s2, south 79) A racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision takes 20 ms. What is the average acceleration of the ball during the 79 collision with the wall? A) 200 m/s2 B) 0 m/s2 C) 2800 m/s2 D) 1300 m/s2 E) 1500 m/s2 80) The velocity v(t) of a particle as a function of time is given by v(t) = (2.3 m/s) + (4.1 m/s2)t - (6.2 m/s3)t2. What is the average acceleration of the particle between t = 1.0 s and t = 2.0 s? A) 13 m/s2 B) 0 m/s2 C) -15 m/s2 D) -13 m/s2 E) 15 m/s2 HORT ANSWER. Write the word or phrase that best completes each statement or answers the question 81). 81) If a car accelerates at a uniform 4.0 m/s2, how long will it take to reach a speed of 80 km/hr, starting from rest?
Transcribed Image Text:increase its speed from 100 m/s to 160 m/s? A) 0.25 s B) 0.058 s C) 17 s D) 4.0 s SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 77) The captain orders his starship to accelerate from rest at a rate of "1 g" (1 g = 9.8 m/s2). How many days does it take the starship to reach 10% the speed of light? (Light travels at 3.0 × 108 m/s.) MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 78) 76) A car is traveling north at 17.7 m/s. After 12 s its velocity is 14.1 m/s in the same direction. Find the magnitude and direction of the car's average acceleration. A) 2.7 m/s2, north B) 2.7 m/s2, south C) 0.30 m/s2, north D) 0.30 m/s2, south 79) A racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision takes 20 ms. What is the average acceleration of the ball during the 79 collision with the wall? A) 200 m/s2 B) 0 m/s2 C) 2800 m/s2 D) 1300 m/s2 E) 1500 m/s2 80) The velocity v(t) of a particle as a function of time is given by v(t) = (2.3 m/s) + (4.1 m/s2)t - (6.2 m/s3)t2. What is the average acceleration of the particle between t = 1.0 s and t = 2.0 s? A) 13 m/s2 B) 0 m/s2 C) -15 m/s2 D) -13 m/s2 E) 15 m/s2 HORT ANSWER. Write the word or phrase that best completes each statement or answers the question 81). 81) If a car accelerates at a uniform 4.0 m/s2, how long will it take to reach a speed of 80 km/hr, starting from rest?
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