A train moves south with a speed of 20m/s. A man on the train walks south with a speed of 0.2m/s relative to the train. how long does it take the man to move 8 m relative to the train. A. 15s
B. 32s
C.40s
D. 0.41s

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)

If water vapor with the mass of 35.0 grams is cooled and condensed into water in a closed system such as a closed glass jar, what is the mass of the water after the water vapor completely condenses? a) 34.5 grams b) 35.0 grams c) 35.5 grams d) the mass cannot be determined without knowing the volume

What practical value did astronomy offer to ancient civilizations?