a car traveling down the expressway at 47.2 m/s Physies 2425 Final Exam- VERSION

Question

a car traveling down the expressway at 47.2 m/s Physies 2425 Final Exam- VERSION B 1. What is 1km in terms of millimeters(mm): a. 1,000,000 b. 1,000 C.100d. 100,000 e10,000 2. During one of the labs you measure the value of gravity to be 9.76m/s2 but the actual value is 9.81m/s2. What is the percent error? a. 0.005% b. 0.05% d, 5% e.0S% 3. What is the mean of the following set of data points? e9.65, 989, 97) a. 0.1266 b. 0.0160 c.2.56x10 d. 9.7467e 3.1220 4. What is the standard deviation of the following set of data points? (9.65,9.89,9.7) a. 9.7467 b. 0.0160 0.1266 d. 2.56x10 e. 3.1220 5. Which of the following five position versus time graphs represents the motion of an object whose speed is increasing? 6. Slope of the velocity vs time plot gives: a. e. b. Velocity c. Displacement d. Acceleration Position Answer is not given 7. A car is traveling down the expressway at 47.2m/s with 1m/s acceleration. How far has the car traveled in 45s? Assume initial position is zero. a. 3336.5m b. 999m e. 4000m c. 2011.5m d. 1062m Slope of the position vs time plot gives: a. Position b. Acceleration e. Answer is not givern 8. . Velocity d. Displacement 9. A car starts from rest and travels 100 m in 4.0 s. Determine the acceleration of the car. a. 25 m/s2 b. 12.5 m/s 1,515 m/hr d. 100 km/

Explanation / Answer

7) initial speed (u) = 47.2 m/s
acceleration (a) = 1 m/s2
t = 45 s
s = ut + (1/2)at2
s = 47.2 x 45 + 0.5 x 1 x 452
s = 3136.5 m

option is not matching.. some mistake is there in the options given.

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