Water freezes at 273 on the ________ scale.
A. Kelvin
B. Fahrenheit
C. Rankin
D. Celsius
E. Vernier
Answer: A
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A 40.0-L container is divided into two equal parts by a rubber membrane. One half of the container has 1.80 moles of an ideal monatomic gas at 270 K, and the other half is a vacuum
The container does not allow any gas to escape but is free to exchange heat with the surroundings. The membrane breaks, the gas expands isothermally and eventually the gas reaches a new equilibrium condition occupying the entire volume. What is the change in entropy of the gas? A) 10.4 J/K B) 9.16 J/K C) 12.5 J/K D) 14.3 J/K E) 16.4 J/K
A 3.00-m-long ladder, weighing 200 N, rests against a smooth vertical wall with its base on a horizontal rough floor, a distance of 1.00 m away from the wall
If the center of mass of the ladder is 1.20 m from its base, what frictional force must the floor exert on the base of the ladder in order for the ladder to be in static equilibrium? A) 93.3 N B) 130 N C) 28.3 N D) 102 N E) 150 N
Considering the three general types of geometry (flat, spherical, and saddle-shaped). If the spacetime of the universe is infinite, what might the geometry of the universe be?
A) either flat or saddle-shaped B) flat, spherical, or saddle-shaped C) only flat D) either flat or spherical E) only spherical
A refracting astronomical telescope has objective and eyepiece lenses of focal lengths 30.0 cm and 0.40 cm, respectively. What is the angular magnification of this instrument?
a. 25 b. 49 c. 75 d. 143 e. 30.4