Care sunt efectele fortelor de frecare in activitatea cotidiana si in tehnica?

Aquantity of gas has a volume of 1.5 m3 and an absolute pressure of 95 kpa. when the gas is compressed to a volume of 0.5 m3, what is the new absolute pressure of the gas? (assume that there’s no change in temperature.)

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?

What sort of waves exhibit the doppler effect?