A dog is running in a straight line to catch a ball. It’s motion is shown on the following graph of horizontal position x vs. time t. What is the average velocity of the dog between the times t=2 s and t=6 s?

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)

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space. b. we'll know it immediately because it will be brighter than the full moon in the sky. c. we won't know about it until 600 years from now. d. none of the above.

Avoltaic cell converts chemical energy to