Two kilograms of molten copper at 1083ºC are dropped into water at 40ºC. Determine the freezing time for complete solidification of the copper. Assume lumped heat capacity and that the heat of fusion of copper is 204.7 kJ/kg and the convective heat transfer coefficient have is 120 W/m2?K. Hint: Use Equation 10-66 for freezing instead of melting.
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If the number of disease-causing bacteria can grow exponentially in the body, why don't all people succumb to them at an early age?
What will be an ideal response?
A v-t graph is drawn for a ball moving in one direction. The graph starts at the origin and at t = 6 s the acceleration of the ball is zero. We know that at t = 6 s,
a. the slope of the curve is non-zero. c. the velocity of the ball is not changing. b. the curve is not crossing the time axis. d. the curve is at v = 0, t = 0.
The most basic of the sciences of physics, chemistry, and biology is
A) physics. B) chemistry. C) biology. D) none of the above
Name four properties of Mars that are similar to those of Earth today.
a. Magnetic field; average density; atmospheric chemical composition; active water erosion of the surface. b. Differentiated body; location in the Solar System; has weather and seasons; surface temperatures can be Earthlike. c. Differentiated body; location in the Solar System; atmospheric chemical composition; active water erosion of surface. d. Magnetic field; average density; has weather and seasons; surface temperatures can be Earthlike.