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PHY101_Exam1example

# 47 ms2 for 439 s a what is the value of the constant

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Unformatted text preview: for 4.39 s (a) What is the value of the constant velocity in the second segment? (3 points) (b) What is the total displacement for the trip? (4 points) (c) What are the average speeds for segments 1, 2 and 3 of the trip? (3 x 3 = 9 points) (d) What is the average speed for the entire trip? (3 points) Student Name:___________________________Student Number:_________ 11. A rescue airplane moving horizontally with a constant velocity of +115 m/s at an altitude of 1050 m, releases a food package to pilots stranded in an island. Ignore air resistance. (a) What are the magnitude and direction of the horizontal and vertical components of acceleration of the food package? (1+1+1+1 = 4 points) (b) What is the time required for the package to hit the ground? (4 points) (c) What are the horizontal and vertical components of the velocity when the package hits the ground? (2+4= 6 points) (d) What is the total final velocity? (2 points) (e) What is the angle of the final velocity vector of the package when it strikes the ground? (3 points) Student Name:___________________________Student Number:_________ 12. A car of mass m = 2000 kg is on an icy driveway inclined at = 20 o, as in figure. Assume that the incline is frictionless. (a) Draw a free body diagram indicating all the forces involved (2 points) (b) Find the acceleration of the car (5 points) (c) If the length of the driveway is 25 m and the car starts from rest, how long does it take to travel to the bottom? (5 points) (d) What is the speed of the car at the bottom? (5 points) (e) If the car's mass is changed to 5000 kg, what will be new the accelaration? (2 points)...
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