When water boils, energy added to the water is counteracted by
A) decreased pressure in the water.
B) static equilibrium.
C) energy carried away by steam.
D) energy of the whole system.
E) none of the above
Answer: C
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A round coin has a diameter of 19.55 mm, a thickness of 1.55 mm, and a mass of 2.50 g. What is its density?
A) 5.37 × 103 kg/m3 B) 21.5 × 103 kg/m3 C) 1.34 × 103 kg/m3 D) 2.68 × 103 kg/m3 E) 1.86 × 10-4 kg/m3
Young's Modulus: A 1200-kg car is being raised at a constant speed if 25 cm/s by a crane, using a 20-m long steel cable that is 1.5 cm in diameter. Young's modulus for steel is 2.0 × 1011 Pa. What is the change in length of the cable caused by the car?
A. 6.7 mm B. 6.7 cm C. 3.3 mm D. 3.3 cm E. 3.3 m
A drive shaft resists torsional shear stress of 45 MPa and axial com-pressive stress of 100 MPa. The maximum shear stress is approximately:
(A) 42 MPa
(B) 67 MPa
(C) 71 MPa
(D) 93 MPa
Astronomers have discovered two black holes in the process of merging
Indicate whether the statement is true or false