Which of these situations is possible?
1.Energy is transferred by heat to a system and the internal energy of the system decreases.
2.Energy is transferred by heat to a system and the internal energy of the system remains constant.
3.Energy is transferred by heat to a system and the internal energy of the system increases.
4.All of these are possible.
4
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A stepped steel shaft with diameters d1 5 56 mm and d2 5 52 mm is twisted by torques T1 5 3.5 kN?m and T2 5 1.5 kN?m acting in opposite directions. The maximum shear stress is approximately:
(A) 54 MPa
(B) 58 MPa
(C) 62 MPa
(D) 79 MPa
What is the name for the period of time it takes the Moon to circle the Earth once?
What will be an ideal response?
How might a coronal mass ejection affect Earth?
What will be an ideal response?
How many Earth years does it take Pluto to orbit the Sun?
A. 248 B. 0.2 C. 0.5 D. 2012 E. 10