A particle is moving at 0.86c. By what magnitude percentage is the Newtonian expression for momentum in error? (The percentage error is the difference between the erroneous and correct expressions, relative the correct one)
A) 49%
B) 40%
C) 55%
D) 62%
A
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A 1500-kg car traveling at 90 km/h toward the east suddenly collides with a 3000-kg car traveling at 60 km/h toward the south
The two cars stick together after the collision. What is the speed of the cars after collision? A) 8.3 m/s B) 14 m/s C) 17 m/s D) 22 m/s
High voltages are desirable for long distance transmission of electric power because
A. the higher the voltage the higher the current, which reduces the power lost B. the higher the voltage, the lower the current, which reduces the power lost C. the higher the voltage the less concern there is for safety
Would water molecules in Venus's atmosphere, whose temperature is 740 K, eventually es-cape into outer space? Note that a water molecule has a mass that is 18 times that of a hy-drogen atom. The escape velocity of Venus is 10 km/s. For comparison, a hydrogen atom has an average velocity of 2.5 km/s at a temperature of 300 K.
a. No, the average velocity of water molecules is 0.9 km/s. b. Yes, the average velocity of water molecules is 0.9 km/s. c. Yes, the average velocity of water molecules is 2.1 km/s. d. No, the average velocity of water molecules is 2.1 km/s. e. Yes, the average velocity of water molecules is 19 km/s.
Classical theory predicts that the planets can orbit the Sun quite stably
Why could not stable orbits be predicted for the atom by simply substituting the electrical attraction for the gravitational attraction? Why was there a classical crisis in describing the atom?