Which of these planets is approximately the same size as Earth?
a. Venus
b. Mars
c. Saturn
d. Mercury
e. Pluto
a
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Molecular Speeds: Dust particles in a grain elevator frequently have masses of the order of 1.0 × 10-9 kg. If, to a first approximation, we model the dust particles as an ideal gas, what would be the rms speed of such a particle in air at 27°C? The Boltzmann constant is 1.38 × 10-23 J/K.
A. 3.5 × 10-6 m/s B. 5.6 × 10-5 m/s C. 7.8 × 10-4 m/s D. 5.2 × 10-3 m/s E. 4.9 × 10-2 m/s
A baseball is struck by a batter at an angle such that it reaches its maximum height at the location of the pitcher – and just grazes the top of the pitcher’s head (at an elevation of 1.50 m above the launch point of the baseball). The pitcher is a horizontal distance of 20.0 m from the point at which the ball was struck. What was the launch angle for the baseball?
a. 
b. 
c. 
d. 
e. 
f. 
Compared with the other jovian planets, Neptune is:
A) much larger and featureless. B) small with features similar to Jupiter. C) small and featureless. D) much larger with features similar to Saturn. E) average, but featureless.
If Q = 350 ?C and I = 4.0 mA in the circuit segment shown below, determine the potential difference, VA ? VB
a.
?30 V
b.
+80 V
c.
+40 V
d.
?40 V
e.
+10 V