What is a normal resting heart rate for adults, according to the American Heart Association?
A. 50-100 bpm
B. 50-70 bpm
C. 100-150 bpm
D. 25-75 bpm

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

Agroup of students were investigating the force of gravity. they began by dropping a foam ball from a height of 3 meters into a bucket of sand. the ball hit the sand in 0.306 seconds. they dropped additional balls of approximately the same diameter, but of different masses. here is the data they collected. based on this experiment and the collected data, what would their conclusion be?

What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 480 ? the index of refraction of the film is 1.34, and there is air on both sides of the film. express your answer in nanometers. hint 1. how to approach th