The International Space Station (ISS) is in circular orbit 400 km above Earth’s surface. An astronaut appears to be apparently weightless; however, he still has 88% of his weight. Justify and provide a mathematical explanation.

Assume similar data for the motion of the blood in your aorta. estimate how many beats of the heart it will take the blood to get from your heart to your brain. (assume that the distance from your heart to your brain is 30 cm)

Which two particles are found in the center of an atom

Selma made a diagram to compare convection and radiation. which label belongs in the area marked x? must involve temperature differences between substances or objects only occurs when molecules are in direct contact involves the movement of fluids based on density differences can occur where there is little or no matter