Nitrogen gas is used to harden iron by diffusing the nitrogen into BCC iron at 700°C. If the surface concentration of nitrogen is maintained at 0.1 weight percent, what is the expected concentration of nitrogen 1 mm from the surface after 10 hours? You can assume that at small values of z, erf(z) is approximately equal to z.
What will be an ideal response?
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A baseball catcher puts on an exhibition by catching a 0.200-kg ball dropped from a helicopter at a height of 150 m above the catcher. If the catcher "gives" with the ball for a distance of 0.755 m while catching it, what average force is exerted on the mitt by the ball? (g = 9.80 m/s2)
a. 39.7 N b. 294 N c. 389 N d. 399 N e. 1110 N
Vector quantities are represented in terms of their magnitude and direction
Indicate whether the statement is true or false
A 1,800 kg car is traveling at 20.0 m/s NORTHEAST. The momentum of the car is
A. 18,000 kg m/s NORTHEAST. B. 20,000 kg m/s NORTHEAST. C. 28,000 kg m/s NORTHEAST. D. 32,000 kg m/s NORTHEAST. E. 36,000 kg m/s NORTHEAST.
An observer traveling with speed 0.5c moves directly toward a beacon emitting photons with speed c in her direction. The observer measure the speed approaching photons to be
(a) 0.25c (b) 0.5c (c) c (d) 1.5c