Asolid, glowing-hot object will emit light over the full range of wavelengths resulting in a spectrum. if a diffuse and relatively cool cloud of gas is located between the glowing, hot object and an observer, the observer will detect an spectrum coming out of the cloud. another type of spectrum is given off by a neon sign which is a tube of gas whose electrons are excited by an electric current. the mostly red light given off by the sign is in the form of an spectrum.

Amachinist needs to remove a tight fitting pin of material a from a hole in a block made of material b. the machinist heats both the pin and the block to the same high temperature and removes the pin easily. what statement relates the coefficient of thermal expansion of material a to that of material b? a) the situation is not possible, heating block b will shrink the hole in the material as the material expands with increasing temperatureb) material b has the same coefficient of expansion as does material ac) material b has a negative coefficient of expansion and a has a positive coefficient of expansiond) material a has a greater coefficient of expansion than does material be) material b has a greate

Using the work energy theorem. what is the velocity of a 850kg car after starting at rest when 13,000j of work is done to it.

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer