A steel alloy that has an initial carbon concentration of 0.1 weight %carbon is to be case-hardened by packing it in carbon that maintains a surface concentration of 1 weight %carbon at 1000°C. After 11.8 hours the carbon concentration is 0.5 weight % at a depth of 1 mm into the steel. What time is required to obtain a carbon concentration of 0.5 weight %at a depth of 2 mm into the steel?
What will be an ideal response?
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In the context of the behavior of black holes, briefly explain the concept of time dilation
What will be an ideal response?
Which statement about the rotations of the Moon and Mercury is FALSE?
A) Our Moon is in a 1:1 synch with the Earth, keeping the same side toward us. B) Mercury is in the 3:2 synch with the Sun, with the same side Sunward at perihelion. C) Like our Moon, Mercury does not rotate at all, keeping the same side facing the Sun. D) On Mercury, three days exactly equal two years. E) On the Moon, each "day" lasts about 15 Earth days of constant sunlight.
A car moving at 50 km/h skids 20 m with locked brakes. How far will it skid if its initial speed is 150 km/h?
A) 20 m B) 60 m C) 90 m D) 180 m
Both nuclear reactors and atomic bombs use nuclear chain reactions
a. True b. False Indicate whether the statement is true or false