A145.0 km long electric power line made out of copper is installed during the spring months at an average temperature of 13.7 °c. what is the change in the length of the power line on a hot summer day, when the temperature is 42.0 °c? the coefficient of linear expansion for copper is 1.62×10-5 1/c°. use positive sign for an increase in length and negative for a decrease.

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.

"an open tank has the shape of a right circular cone. the tank is 6 feet across the top and 5 feet high. how much work is done in emptying the tank by pumping the water over the top edge? note: the density of water is 62.4 lbs per cubic foot."

What is a carrier wave and how does it affect what you hear on the radio