The root-mean-square speed (thermal speed) of the molecules of a gas is 200 m/s at a temperature 23.0°C. What is the mass of the individual molecules? The Boltzmann constant is 1.38 × 10-23 J/K
A) 2.13 × 10-25 kg
B) 2.45 × 10-25 kg
C) 5.66 × 10-25 kg
D) 1.78 × 10-25 kg
E) 3.11 × 10-25 kg
E
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What is true of Jupiter's magnetosphere?
A) Although its surface field is greater, since the planet is larger the total field is actually weaker than Earth's. B) It does not trap protons and electrons, as Earth's Van Allen belts do. C) It has a tail that extends at least to Saturn's orbit. D) It is most extensive on the sunward side of the planet. E) It is only slightly stronger than Saturn's.
A 3.0-kg block is on a horizontal surface. The block is at rest when, at t = 0, a force (magnitude P = 12 N) acting parallel to the surface is applied to the block causing it to accelerate. The coefficient of kinetic friction between the block and the surface is 0.20 . At what rate is the force P doing work on the block at t = 2.0 s?
a. 54 W b. 49 W c. 44 W d. 59 W e. 24 W
Applications to Astronomy: In terms of the mass M of our sun, what is the Chandrasekhar limit of stellar mass, below which a star will eventually collapse into a white dwarf?
A. 0.8 M B. 1.2 M C. 1.4 M D. 1.9 M
How are mass and weight different?
A. Weight is the amount of matter an object contains; mass is the type of matter an object is made of. B. Mass is the amount of matter an object contains; weight is how much mass an object contains. C. Weight is a measure of how much gravity pulls an object; mass is how much matter the object has. D. There is no difference; they are the same.