Ten kg of copper (use Cp,cu = 0.39 kJ/kg·K) at 200°C are submerged in 50 kg of water at 10°C in an insulated container. After a long time, the temperature will be nearest:
A) 35.5°C
B) 28.5°C
C) 20.5°C
D) 13.5°C
D) 13.5°C
The heat from the copper enters the water:
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A certain band-limited periodic current has only three frequencies in its Fourier series representation: dc, 50 Hz, and 100 Hz. The current may be represented as i(t) = 4 + 6 sin 100 ? t + 8 cos 100 ? t - 3 sin 200 ? t - 4 cos 200 ? t A
(a) Express i(t) in amplitude-phase form. (b) If i(t) flows through a 2-? resistor, how many watts of average power will be dissipated?
Answer the following statement(s) true (T) or false (F)
1. Matter can exist in four states, depending on its own and the surrounding conditions: solid, liquid, gaseous, or plasma. 2. Mass is a fundamental dimension. 3. The further away the mass is located from the center of rotation, the easier it will be to rotate the mass about that axis. 4. Momentum is a fundamental dimension.
Surfaces that may be unfolded or unrolled to lie flat are said to be a "developable surface."
Indicate whether the statement is true or false
97.5 ÷ 6.5 = ____________________.
Fill in the blank(s) with the appropriate word(s).