A metal bar is 20 cm long and has a rectangular cross-section measuring 1.0 cm × 2.0 cm. What is the voltage across its length when there is a 4000-A current through it? The resistivity of the metal is 1.68 × 10-8 ? ? m
A) 0.67 V
B) 0.34 V
C) 0.067 V
D) 0.034 V
C
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Most of the dark regions on Mars visible from Earth are:
A) features like the Valles Marineris. B) lava flows from active volcanoes. C) mountainous regions. D) the seasonal growth of vegetation on the planet. E) volcanic planes like the lunar maria.
The most commonly used fonts in web design are serif and sans serif.
Answer the following statement true (T) or false (F)
Two beams of coherent light travel different paths arriving at point P. If the maximum destructive interference is to occur at point P, what should be the phase difference between the two waves?
A) The phase difference between the two waves is ?/4. B) The phase difference between the two waves is ?/2. C) The phase difference between the two waves is ?. D) The phase difference between the two waves is 2?. E) The two waves are in phase.
First Law of Thermodynamics: A sealed rigitd tank contains 30 moles of an ideal gas, at an initial temperature of 270 K. The pressure of the gas is increased until the final pressure equals 1.40 times the initial pressure. The heat capacity at constant pressure of the gas is 32.0 J/mol ? K. What is the change in the internal (thermal) energy of the gas during this process? (R = 8.31 J/mol ? K)
A. 77 kJ B. 100 kJ C. 130 kJ D. -50 kJ E. -23 kJ