MAE-2102 Key Problems
Unit #1 Kinematics & Kinetics of Particles
Chapter 12
1.
A boy at A throws a ball 45o from the horizontal such that it strikes the slope at B. Determine the speed
at which the ball is thrown and the time of flight.
Chapter 13
2.
The double inclined plane supports two blocks A and B, each having a weight of 10 lb. If the
coefficient of kinetic friction between the blocks and the plane is μk = 0.1, determine the acceleration
along the plane for each block. Assume the blocks start at rest.
Chapter 13
3.
Using a forked rod, a smooth cylinder P, having a mass of 0.4 kg, is forced to move along the vertical
slotted path r = (0.6 θ) m, where θ is in radians. If the forked rod has a constant angular speed of
θ& =0.2 rad/s, determine the force of the rod and the normal force of the slot on the cylinder at the
instant θ = π rad. Assume the cylinder is in contact with only one edge of the rod and slot at any
instant.
R. Gist
1
Ver. A, Rev. 1
MAE-2102 Key Problems
Unit #1 Kinematics & Kinetics of Particles
Chapter 14
4.
The 50-lb load is hoisted by the pulley system and motor M. If the crate starts from rest and by
constant acceleration attains a speed of 15 ft/s after rising 6 ft, determine the power that must be applied
to the motor at this instant. The motor has an efficiency ε = 0.76. Neglect the mass of the pulleys and
cable.
Chapter 14
5.
Roller coasters are designed so that riders will not experience more than 3.5 times their weight (i.e.
normal force + weight = 3.5*weight) as a normal force against the seat of the car. Determine the
smallest radius of curvature ρ of the track at its lowest point if the car has a speed of 5 ft/s at the crest
of the drop. Neglect friction.
Chapter 15
6.
The 20-lb cart B is supported on rollers of negligible size. If a 10-lb suitcase A is thrown horizontally
on it at 10 ft/s, determine the time t and the distance B moves before A stops relative to B. The
coefficient of kinetic friction between A and B is μk =0.4.
R. Gist
2
Ver. A, Rev. 1
MAE-2102 Key Problems
Unit #1 Kinematics & Kinetics of Particles
Chapter 15
7.
(12 pts) Determine the magnitude of the angular momentum of the 2.5-kg particle about point O.
a.
b.
c.
R. Gist
104 (kg m2)/s
182 (kg m2)/s
262 (kg m2)/s
3
Ver. A, Rev. 1