MAE 2103 Engineering Mechanics I
Practice Exam 3
1. Find the horizontal and vertical forces acting at pin C.
2. Determine the minimum force P necessary to move the 200lb crate which has a center of gravity as shown. The
coefficient of static friction at the floor is s=0.35. Will the
crate tip or slip?
3. The velocity of a particle along a line is found to be v(t)=(2t-1)2+(t+4) measured in meters per
second. What is the acceleration of the particle at t=6 seconds? If the particle started at x=0, where
is the particle at t=6 seconds?
R. Gist
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Ver. C, Rev. 1
MAE 2103 Engineering Mechanics I
Practice Exam 3
4. A particle undergoes non-constant acceleration a=6*x2 m/s2 as it travels from x1=3 m to x2=15 m.
If it was initially traveling 8 m/s, what is
its final speed?
5. A boy at A throws a ball 45o from the
horizontal with a speed of 30 m/s such
that it strikes the slope at B after being in
the air for 3 seconds. Determine the vector from A to B.
6. A car traveling along a circular stretch of road with radius of curvature 100 meters is moving at 40
m/s. At time t=0, the driver hits the brakes and begins decelerating at 2 m/s2. Find the speed and
total acceleration of the car 3 seconds after the driver begins slowing the car.
7. The position of a pin relative to the origin is given in polar coordinates by r(t)=3*t2 and (t)=*t,
where t is in seconds, r is in meters and  is in radians. Find the magnitude of the total acceleration
of the pin when t=1 second.
R. Gist
2 of 2
Ver. C, Rev. 1