At a resting pulse rate of 77 beats per minute, the human heart typically pumps about 67 ml of blood per beat. blood has a denstity of 1060 kg / m3. circulating all of the blood in the body through the heart takes about 1 min for a person at rest. (a) how much blood is in the body? (b) on average, what mass of blood does the heart pump with each heart beat?

Velocity is a description of both speed and direction, therefore it - a vector - a force arrow - the same as acceleration - a magnitude

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?