A sample of an unknown substance has a mass of 89. 5 g. If 345. 2 j of heat are required to heat the substance from 285 k to 305 k, what is the specific heat of the substance? use the formula q = mces001-1. Jpges001-2. Jpgt. J/g•k.

Answera major is needed to earn a bachelors;

Bbecause i need points 

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.