If n moles of an ideal gas are compressed isothermally from an initial volume V1 to a final volume V2, what is the change in entropy?
A.
B.
C.
D.
E.
Answer: A
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A block (mass mA) lying on a fixed frictionless inclined plane is a mass ma by a cord passing over a pulley, as shown in Fig. 4-54.
(a) Determine a formula for the acceler ation of the system in terms of mA, mB, ?, and g,
(b) What conditions apply to masses mA and mp for the acceleration to be in one direction (say, ma down the plane), or in the opposite direction? Ignore the mass of the connected to cord and pulley.
A car is traveling at the velocity of 20 m/s on a flat road when it reaches the bottom of a hill. It coasts up the hill, coming to rest in 8 seconds. The average acceleration of the car while on the hill is
A. 2.5 m/s2. B. -2.5 m/s2. C. 10 m/s2. D. 0 m/s2. E. -10 m/s2.
A semiconductor has an energy gap of 2.5 eV. What is the longest wavelength light of those listed below that will promote valence electrons into the conduction band?
A) 450 nm B) 525 nm C) 600 nm D) 725 nm E) 350 nm
A student finds a blank liquid bulb thermometer and calibrates the scale by placing it in ice water and placing a reference mark at the level of the fluid
The student places the thermometer in boiling water and finds that the fluid level is 12.0 cm above the reference mark. What is the temperature when the fluid level is 2.4 cm above the reference mark? A) 2.4°C B) 24°C C) 25°C D) 28°C E) 20°C