During an experiment a student records the net horizontal force exorted on an object moving in a straight line along a horizontal frictionless track. The graph above shows the force as a function of time of the following, which is the best approximation of the magnitude of the change in momentum of the
object between 0 and 4s?

Which of the following represents a virtual image?

How many neutrons does plutonium -196 with an atomic number of 78.

Blood pressure the total amount of blood the heart pumps in one minute 2. cardiac output the number of times your heart beats in a minute 3. dilate the amount of blood that the heart can pump in a single beat 4. heart rate the force exerted on the walls of the blood vessels by the blood that moves through them 5. stroke volume to widen or get larger in size