Physics 205 Ock Test 2 Form 2 Worksheet With Answers - Dr. Huerta, 2014 Page 3
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6Dr. Huerta Phy 205 oCK Test 2 FORM 2 ANSWER KEY March 3, 2014
[6] The position of a 0.1 kg particle moving along the x axis at time t is
5
5
x(t) = 2 m/s
t
. The magnitude of the force acting on the particle at
t = 2 s is
[X] 32 N [b] 16 N
[c] 1.6 N
[d] 4 N
[e] 6.4 N
[7] In the system of ideal massless pulleys in the figure to the left below the
tension T in the rope is
mg
mg
[a] T = mg [b] T = 2mg
[c] T = 3mg [d] T =
[X] T =
2
3
C
A
B
[8] The three men called A, B and C shown in the figure to the right above are
at rest. Each man weighs 1000 N. Each man exerts a force of 100 N toward
the left against the floor. The horizontal force that C exerts on the wall is
[a] 100 N
[b] 200 N
[X] 300 N
[d] 400 N
[e] 600 N
[9] Three blocks of equal mass m shown in the figure below are sliding with
acceleration a on a frictionless surface. The tension in ropes A, B, and F
are
A
B
F
m
m
m
[a] T
= ma, T
= ma, F = ma [X] T
= ma, T
= 2ma, F = 3ma
A
B
A
B
[c] T
= ma, T
= ma, F = 3ma [d] T
= ma, T
= 2ma, F = 2ma
A
B
A
B
[e] T
= ma, T
= ma, F = 2ma
A
B
[10] A rod of mass m and length L lies on the x axis with its left end at the
origin. A second identical rod is placed vertically along the y axis with its
bottom end at the origin. The (x, y) coordinates of the center of mass of
the system are
2L
2L
L
L
L
L
L
L
[a] (
,
)
[b] (0,
)
[c] (
, 0)
[d] (
,
)
[X] (
,
)
2
2
2
2
4
4
2
2
Physics 205D TEST 2 FORM 2
March 3, 2014
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