A sample of iron weighs more after it rusts because
A) it has expanded into a greater volume.
B) rust contains twice as many iron atoms.
C) of the additional oxygen it contains.
D) Wrong. Iron actually weighs less after it rusts.
Answer: C
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Blue stars emit most of their energy at shorter wavelengths than red stars
a. True b. False Indicate whether the statement is true or false
A steam generating unit burns coal, with the combustion gases at 900ºC filling the combustion chamber. The combustion chamber is a right circular cylinder 10 m in diameter and 15 m tall. Estimate the heat transfer to the walls if the walls are at 500ºC and have emissivity of 0.9.
What will be an ideal response?
Molar Specific Heats: A sealed 87-m3 tank is filled with 6000 moles of ideal oxygen gas O2 at an initial temperature of 270 K. The gas is heated to a final temperature of 460 K. The atomic mass of oxygen is 16.0 g/mol. How much heat is transferred to the gas during this process? (R = 8.31 J/mol ? K)
A. 24 MJ B. 28 MJ C. 19 MJ D. 14 MJ E. 9.1 MJ
Answer the following statement(s) true (T) or false (F)
1. The current flow in the wire is constant in time. 2. The current is the same for any cross-sectional area spanning the wire at any point along the wire. 3. The electric field inside the wire is zero. 4. The net charge density in the wire’s interior is zero. 5. Excess charges may be found on the wire’s surface.