Exam 3 Quiz #3

7 Questions | Total Attempts: 156

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• 1.
Which of the following statements are true about the concept of field forces?I.   Field forces can be exerted by objects that are in physical contact.II. Field forces can be exerted by objects that are not in contact.III. There are four fundamental field forces.
• A.

I only

• B.

II only

• C.

II and III

• D.

I, II, and III

• 2.
Which of the following situations describes inertia?
• A.

A stationary object tends to resist being moved.

• B.

A moving object tends to resist a change in speed.

• C.

A moving object tends to resist a change in direction.

• D.

All of the above

• 3.
Which of the following statements describe an object in equilibrium?I.   The object is at rest.II.  The object is moving at constant velocity.III. The net external force on the object is zero.
• A.

I and II

• B.

I and III

• C.

II and III

• D.

I, II, and III

• 4.
A rigid rod holds a restaurant sign horizontally from the side of a building. The force due to gravity acting on the sign is 165 N with the angle between the sign and the rod being 50 degrees. Ignoring the weight of the rod, what is the magnitude of the tension in the rod?
• A.

257 N

• B.

335 N

• C.

165 N

• D.

215 N

• 5.
About 50 years ago, the San Diego Zoo, in California, had the largest gorilla on Earth: its mass was about 3.10 x 102 kg. Suppose a gorilla with this mass hangs from two vines, each of which makes an angle of 300 with the vertical. Draw a free-body diagram showing the various forces, and find the magnitude of the force of tension in each vine. What would happen to the tensions if the upper ends of the vines were farther apart?
• A.

1748 N

• B.

3041 N

• C.

2098 N

• D.

1456 N

• 6.
Consider the symmetrical hanging of a sign. If the sign is known to have a mass of 15 kg and if the angle between the two cables is 120 degrees, then what is the tension in the cable?
• A.

86 N

• B.

15 N

• C.

147 N

• D.

170 N

• 7.
A 200-N ball hangs from a cord knotted to two other cords, as shown in the figure below.  Find the tensions in ropes A, B, and C.
• A.

A = 102 N; B = 146 N; C= 200 N

• B.

A = 146 N; B = 102 N; C = 200 N

• C.

A = 185 N; B = 152 N; C = 200 N

• D.

A = 152 N; B = 185 N; C = 200 N