The melting point of aluminum is 660°C, its latent heat of fusion is 4.00 × 105 J/kg, and its specific heat is 900J/kg ? K. How much thermal energy must be added to 500 g of aluminum originally at 27°C to completely melt it?
A) 485 kJ
B) 395 kJ
C) 273 kJ
D) 147 kJ
E) 14 kJ
A
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Exclusion Principle: A hydrogen atom is in the 6h state. Which one of the following numbers could be an orbital angular momentum quantum number ? for that state?
A. 5 B. 6 C. 7 D. 8 E. 9
A beam with an overhang is loaded by a uniform load of 3 kN/m over its entire length. Moment of inertia Iz 5 3.36 3 106 mm4 and distances to top and bottom of the beam cross section are 20 mm and 66.4 mm, respectively. It is known that reactions at A and B are 4.5 kN and 13.5 kN, respectively. The maximum bending stress in the beam is approximately:
(A) 36 MPa
(B) 67 MPa
(C) 102 MPa
(D) 119 MPa
That we do not get eclipses every new and full Moon is due to the ________ degree tilt of the Moon's orbit, relative to the ecliptic
Fill in the blank(s) with correct word
Suppose that in a certain collection of nuclei there were initially 1024 billion nuclei, and 20.0 minutes later there was only 1.00 billion nuclei left, the others having decayed
On the basis of this information, how many nuclei would you estimate decayed in the first 6.00 minutes?