In casting experiments performed using a certain alloy and type of sand mould, it took 155 sec for a cube-shaped casting to solidify. The cube was 50 mm on a side. Find out the value of the mould constant (in sec/mm2 unit) using chvorinov's rule.

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.

Ithink the answer is d.