Quiz_4_103007_answer - Physical Science 303 Name : Quiz #4,...

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Physical Science 303 Quiz #4, Oct. 30 2007 Name : 1. A net force of 2000N is exerted on a compact car with a mass of 1000kg. (10pts) a. How large acceleration of the car is produced by this force? (2pts) F=ma, a=F/a=2000N/1000kg = 2m/s 2 b. If the 2000N force is exerted for 10s, how long will this car travel? (3pts) d=1/2 a t 2 = 1/2 2m/s 2 (10s) 2 = 100 m c. After the first 10s, what is its magnitude of the velocity? If no more force is exerted, what happen to this car? Explain with one of the Newton’s Laws (5pts) a=Δv/Δt = (v f – v i )/Δt, 2m/s 2 = v f /10s, v f =2m/s 2 x 10s = 20m/s 2. Steve can drive his Porsche from 0 to 100 mph in 6.3 seconds. (10pts ) (1 mile = 1.609 km) a. What is his acceleration in SI units?(3pts) 1 mile = 1609.34, 1hr =3600 s a=Δv/Δt = 100 mph /6.3 s 100 x 1609.34 m/3600 s /6.3s = 7.096 m/s 2 b. If the car’s mass is 600 kg, what is the net force acting on the car? (4pts) (Answer in SI unit) F=ma = 600 kg x 7.096 m/s 2 = 4257.6 N c. How far down the track is Steve at the end of 6.3 seconds? (3pts)
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This note was uploaded on 04/29/2008 for the course PS 303 taught by Professor Modi during the Spring '08 term at University of Texas at Austin.

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Quiz_4_103007_answer - Physical Science 303 Name : Quiz #4,...

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