Second major exam Term 993
Q1
A 50-kg box is pulled at constant speed 10 m up a plane 60 degrees above the horizontal by a force
parallel to the plane (see figure 1). The coefficient of kinetic friction between the box and the plane is
0.30. How much work is done by the applied force ?
A1 5.0
kJ
A2 3.5
kJ
A3 5.7
kJ
A4 0.57 kJ
A5 4.2
kJ
Q2
A 3.0-kg is attached to a spring of force constant 20 N/m (see figure 2) and rests on a frictionless
surface. The block is pulled
2.0 m to the right and released from rest.
What is its kinetic energy when
it is 1.0 m from the equilibrium position ?
A1 30 J
A2 10 J
A3 40 J
A4 50 J
A5 25 J
Q3
A 20-kg mass is attached to a spring (k=380 N/m) that passes over a pulley as shown in figure 3. The
pulley is frictionless and massless. The mass is released from rest with the spring unstretched. What is
the speed of the mass at the instant when it has dropped a vertical distance of 0.4 m ?
A1 2.2
m/s
A2 2.5
m/s
A3 1.5
m/s
A4 4.8
m/s
A5 3.6
m/s
Q4
A particle moves 5 m in the positive x-direction while being acted upon by a constant force
F=(4*i + 2*j) N, where i and j are unit vectors along the x-axis and the y-axis, respectively. What is the
work done on the particle by this force?
A1 +20
J
A2 +10
J
A3 +30
J
A4 -15
J
A5 zero
Q5
Two masses are connected as shown in figure 4. The coefficient of kinetic friction between the 2.0-kg
mass and the surface is 0.400. The system starts from rest. What is the speed of the 6.0-kg mass at the
instant when it has fallen 1.5 m? Assume that the pulley is massless and frictionless.

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