The mass density of normal air is, at 
and the average molecular mass of air is 29.0 u. If the mean free path of an air molecule at room temperature is measured to be 111 nm, what is the average diameter of an air molecule.
A. 0.31nm
B. 0.26nm
C. 0.28nm
D. 0.49nm
E. 0.56nm
F. 0.23nm
C. 0.28nm
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In which of the following cases is the acceleration zero?
A. a car increases its speed from 0 mph to 30 mph B. a car decreases its speed from 15 mph to 5 mph C. a car goes around a curve at a speed of 30 mph D. a car backs out of a drive at 10 mph
Strictly speaking, more fuel is consumed by your car if the air conditioner, headlights, or even a radio is turned on. This statement is
A) false. B) true only if the car's engine is running. C) true.
A part is to be made from the 4340 steel in Table 11.2. The part has a yield strength of 1515 MPa. This design requires that the calculated fracture stress must be at least twice as large as the yield stress, to ensure that fracture does not occur before yield. What is the minimum detectable crack length capability required of the NDT equipment to ensure this condition?
What will be an ideal response?
The average speed of stars relative to the Sun in the solar neighborhood is about 20 km/s. Suppose you discover a star in the solar neighborhood that is moving relative to the Sun at a much higher speed, say 220 km/s
What kind of orbit does this star probably have around the Milky Way? In what part of the galaxy does it spend most of its time? Explain.