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Paymemoney
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Hi can somebody tell me the answer they think is correct for the following multiple choice questions:
1) A uniform rod is attached to a wall by hinge at one end. Initially horizontal, the rod is released from rest to swing downwards. Consider the torque about the hinge produced by the rod's weight. As the rod swings downwards, this torque is:
A. always zero
B. a non-zero constant
C. increasing
D. decreasing
not sure about this
2) 10kg of ice at 0degree C absorbs heat so that it starts to melt. Finally there is a mixture of 5kgt of ice and 5kg of water in thermal equilibrium. Which of the following statements is true?
A. The remaining ice is a at 0 degrees C and the water has a temperature above 0 degree C.
B. The remaining ice has a temperature less then 0 degree C and the water has a temperature of 0 degree C.
C. Both The remaining ice and the water have a temperature of 0 degree C.
D. Both The remaining ice and the water have a temperature above 0 degree C.
i chose A but not sure it is correct.
3) You are provided with two identical springs, each with spring constant 120N/m. The two springs are now joined end to end to make one long spring: the spring constant of the combination is k.
Which of the following is correct?
A. 60 N/m
B. 120N/m
C. 180N/m
D. 40N/m
I got 240 but it is not on the list.
P.S
Homework Statement
1) A uniform rod is attached to a wall by hinge at one end. Initially horizontal, the rod is released from rest to swing downwards. Consider the torque about the hinge produced by the rod's weight. As the rod swings downwards, this torque is:
A. always zero
B. a non-zero constant
C. increasing
D. decreasing
not sure about this
2) 10kg of ice at 0degree C absorbs heat so that it starts to melt. Finally there is a mixture of 5kgt of ice and 5kg of water in thermal equilibrium. Which of the following statements is true?
A. The remaining ice is a at 0 degrees C and the water has a temperature above 0 degree C.
B. The remaining ice has a temperature less then 0 degree C and the water has a temperature of 0 degree C.
C. Both The remaining ice and the water have a temperature of 0 degree C.
D. Both The remaining ice and the water have a temperature above 0 degree C.
i chose A but not sure it is correct.
3) You are provided with two identical springs, each with spring constant 120N/m. The two springs are now joined end to end to make one long spring: the spring constant of the combination is k.
Which of the following is correct?
A. 60 N/m
B. 120N/m
C. 180N/m
D. 40N/m
I got 240 but it is not on the list.
P.S