PHYS 201
Midterm Exam I
18 October 2006
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ID Number
950
Tutorial Section (day, time)
A1
Part I
[30]
1.
A projectile is shot from the edge of a vertical cliff with an initial speed of 38.0 m/s at an angle
of 29.0° above the horizontal. The projectile hits the ground at a horizontal distance of 178 m
from the base of the cliff.
(a)
Draw a sketch illustrating the problem and showing the path of the projectile and the
directions you pick to be positive.
[4]
(b)
Find the horizontal and vertical components of the shot’s initial velocity.
[6]
(c)
What is the projectile’s velocity at its highest point above the ground?
[4]
(d)
Find the time the projectile is in the air.
[6]
(e)
Find the height of the cliff.
[6]
(f)
What is the projectile’s acceleration just before it hits the ground?
[4]
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PHYS 201
Midterm Exam I
18 October 2006
A2
Part II
[70]
2.
A 1250 kg car traveling to the right accelerates from 36 .0 km/h to 90.0 km/h in 4.50 s.
Assuming constant acceleration, find (a) the acceleration of the car in SI units (m/s
2
), and (b) the
net force on the car during the acceleration. Let right be the positive direction.
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 Fall '08
 Jenkins
 mechanics, Acceleration, Velocity, 2.00 kg, 0 km/h, 8.5 km

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