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HWK Force 3

An object hangs at rest with two tension forces acting on it at angles of 20° and 40°. The magnitudes of the tensions are given. Determine the weight of the object and the horizontal components of the tensions. Two forces act on a point particle; determine which magnitude of the resultant force is not possible. As the angle of inclination of a plane decreases, the frictional force and coefficient of static friction between a block and the plane may change in a certain way. Represent the forces on a charged sphere in equilibrium when displaced at an angle from a vertical position near a oppositely charged rod. For an object to be in translational equilibrium, the net force acting on it must be zero. Compare the magnitudes of the net force

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shlok Kotecha
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65 views3 pages

HWK Force 3

An object hangs at rest with two tension forces acting on it at angles of 20° and 40°. The magnitudes of the tensions are given. Determine the weight of the object and the horizontal components of the tensions. Two forces act on a point particle; determine which magnitude of the resultant force is not possible. As the angle of inclination of a plane decreases, the frictional force and coefficient of static friction between a block and the plane may change in a certain way. Represent the forces on a charged sphere in equilibrium when displaced at an angle from a vertical position near a oppositely charged rod. For an object to be in translational equilibrium, the net force acting on it must be zero. Compare the magnitudes of the net force

Uploaded by

shlok Kotecha
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Hwk Force 3 Static Equilibrium

1. An object hangs at rest. The angle  is 20o and  is 40o. T1 = 104N and T2 = 128 N. Determine the
weight of the object and the X components of T 1 and T2.

2. Two forces of magnitudes 7 N and 5 N act at a point. Which one of the following is not a
possible value for the magnitude of the resultant force?

A. 1N

B. 3N

C. 5N

D. 7N

3. A block is at rest on a rough plane inclined at an angle θ relatively to the horizontal.

The angle θ is slowly reduced. Which one of the following correctly describes the changes, if
any, in the frictional force F and the coefficient of static friction between the block and the
plane?

Frictional force F Coefficient of static friction

A. decreases increases

B. decreases constant

C. increases increases

D. increases constant

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4. A small electrically charged sphere is suspended vertically from a thread. An oppositely charged
rod is brought close to the sphere such that the sphere is in equilibrium when displaced from the
vertical by an angle of 45°.

+ –

Which one of the following best represents the free body diagram for the sphere?

A . B .

C . D .

5. For an object to be in translational equilibrium

A. it must be at rest.

B. it must be moving with a constant acceleration.

C. no external force must be acting on it.

D. the net force acting on it must be zero.

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6. Two steel balls, of mass M and 2M, fall at constant speeds in a tube filled with oil.

Which of the following correctly compares the magnitudes of the net force and of the drag
(resistance) force on the two balls?

Net force Drag force


A. same same
B. same different
C. different same
D. different different

7. A student is sitting on a chair. One force that is acting on the student is the pull of gravity.
According to Newton’s third law, there must be another force which is

A. the upward push of the chair on the student.

B. the downward force on the student.

C. the downward push of the chair on Earth.

D. the upward force on Earth.

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