If A is running around a circular park of radius R and stops to meet a friend and chat after covering exactly a semicircle, then what is the distance covered by A from the starting point?

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

Wind and moving water provide energy. question 1 options: chemical mechanical thermal none of the above

Ascientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making it look rainbow-like (an effect known as iridescence). she aims a spectrometer at a particular spot and measures the wavelength to be 750 nm (in air). the index of refraction of water is 1.3