Ascientist is studying a shock wave from an earthquake. what kind of wave is being studying? a.) an electromagnetic wave b.) a gamma ray c.) a radio wave d.) a mechanical wave

25pts the diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Arod of some material 0.20 m long elongates 0.20 mm on heating from 21 to 120°c. determine the value of the linear coefficient of thermal expansion [in (degrees c)^-1] for this material.

Which of the following is not am example of a polymer? protein nylon kevlar concreta