A uniform disk with mass M and radius R sits at rest on an incline 30 to the horizontal. A string is wound around the disk and attached to the top of the incline as shown. The string is parallel to incline. What is the tension in the string?
1.Mg
2.Mg/2
3.2Mg/5
4.Mg/4
5.None of the above
6.Cannot be determined
[Ques. 2] A uniform rod of length 4L, mass M, is suspended by two thin strings, lengths L and 2L as shown. What is the tension in the string at the left end of the rod?
1. Mg
2. Mg/2
3. Mg/3
4. Mg/4
5. None of the above
[Ques. 3] A uniform rod is hinged to a wall and held at a 30 angle by a thin string that is attached to the ceiling and makes a 90 angle to rod. Which statement(s) must be true? (At least one of them is true and at least one is false.)
1.The hinge force is purely vertical.
2.The hinge force is purely horizontal.
3.The string tension is equal to the hinge force.
4.The string tension is smaller than the rod's weight.
5.1 and 3 are true.
6.2 and 3 are true.
7.1 and 4 are true.
8.2 and 4 are true.
9.3 and 4 are true.
10.Three of the statements are true.
[Ques. 4] A uniform rod of length L, mass M, is suspended by two thin strings. Which of the following statements is true regarding the tensions in the strings?
1.T2 = T1
2.T2 = 2.5 T1
3.T2 = 0.6 T1
4.T2 = 0.8 T1
5.None of the above
6.Not enough information to determine
[Ques. 5] Two blocks hang from strings would around different parts of a 2 kg double pulley as shown. The pivot exerts a normal force FN supporting the double pulley. Assuming the system is not in equilibrium, which statement about FN is true after the system is released from rest? (Use g = 10 N/kg.)
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