Long 20 cm by 20 cm square steel stock having a thermal conductivity of 50 W/mK and thermal diffusivity of 1 x 10^-5m^2/s is put in oil at 100ºC when the steel stock is at 300ºC. With a convective heat transfer coefficient of 150 W/m^2K, determine the temperature of the center and the edge of the stock after being heated for 2 minutes in the oil.
What will be an ideal response?
Since the stock is very long, we assume an infinite square stock. The Biot number is
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The density of aluminum is 2700 kg/m3. An aluminum block has a mass of 2.5 kg. The buoyant force exerted on this block when it is completely submerged in water of density 1000 kg/m3 is approximately
A. 0.0091 N. B. 24.5 N. C. 2.5 N. D. 0.93 N. E. 9.1 N.
Two long parallel wires carry currents of 5.0 A and 8.0 A in the opposite direction. The wires are separated by 0.30 m. Find the magnetic force per unit length between the two wires
A) 2.7 × 10-5 N repulsive B) 7.2 × 10-5 N repulsive C) 3.4 × 10-5 N attractive D) 2.7 × 10-5 N attractive E) 7.2 × 10-5 N attractive
A time-varying horizontal force F(t) = At4 + Bt2 acts for 0.500 s on a 12.25-kg object, starting at time t = 1.00 s
In the SI system, A has the numerical value 4.50 and B has the numerical value 8.75. (a) What are the SI units of A and B? (b) What impulse does this force impart to the object?