A 5.00 gram bullet has a velocity of 300 m/s. It strikes a block of wood and penetrates to a distance of 2.00 cm. The average force of the block of wood on the bullet is
A. 9,340 N.
B. 11,250 N.
C. 15,200 N.
D. 19,500 N.
E. 21,400 N.
B. 11,250 N.
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A steel billet is to be heat treated by immersion in a molten salt bath. The billet is 5-cm-square and 1-m-long. Prior to immersion in the bath, the billet is at a uniform temperature of 20°C. The bath is at 600°C and the heat transfer coefficient at the billet surface is 20 W/(m2K). Plot the temperature at the center of the billet as a function of time. How much time is needed to heat the billet center to 500°C? Use an implicit difference scheme with node spacing of 1 cm. The thermal conductivity of the steel is 40 W/(m K) and the thermal diffusivity is 1 x 10–5 m2/s.
GIVEN Steel billet undergoing heat treatment FIND (a) Temperature at the center of the billet as a function of time (b) How much time is needed to heat the center of the billet to 500°C
An astronomical unit is larger than a light-year
Indicate whether the statement is true or false
A sonic boom is produced by an airplane flying at a speed
A) just below the speed of sound. B) equal to the speed of sound. C) greater than the speed of sound. D) all of the above E) none of the above
What fraction of the total energy density in a cavity filled with black body radiation at 5000 K is in the range 5.80 × 1014 Hz and 5.85 × 1014 Hz?
A) 5% B) 10% C) 1.5% D) 1% E) 25%