Today in physic's class, we corrected our questions #1-6 on the sheet we got yesterday & we got a new work sheet, corrected it in class. The answers are posted below by Ms. K. She assigned questions # 1, 5 ,7 pg 105- 106 in the green book. If you weren't here today i have posted the questions below, we will correct it tomorrow in class along with the questions 6- 10 that you are to have finished by tomorrow.
Problems # 1, 5, 7 Pg 105-106
1.) An 873-kg dragster, starting from rest, attains a speed of 26.3m/s in .59s
a.) Find the average acceleration of the dragster during this time interval.
b.) What is the size of the average force on the dragster during this time interval?
c.) Assume the driver has a mass of 68kg. What horizontal force does the seat exert on the driver?
d.) Is the driver's mass in part C an inertial mass or gravitational mass?
5.) After a day of testing race cars, you decide to take your own 1550-kg car onto the test track. While moving down the track at 10m/s, you suddenly accelerate to 30m/s in 10s. What is the average net force that you applied to a car during the 10-s interval?
7.) A force of -9000N is used to stop a 1500-kg car traveling at 20m/s. What braking distance is needed to bring the car to halt?
the blog for tomorrow is Kimberley
REMEMBER TEST ON THURSDAY DECEMBER 13, 2007
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