A ball rolling on the floor eventually comes to a stop. Which statement best describes this situation? The energy on the macroscopic scale decreased, and the energy on the molecular scale increased.

The energy on the macroscopic scale and the energy on the molecular scale both remained constant.

The energy on the macroscopic scale increased, and the energy on the molecular scale decreased.

The energy on the macroscopic scale and the energy on the molecular scale both decreased.

How many dots must be added to the symbol to properly represent a standard nitrogen ion? a) 1 b) 3 c) 5 d) 8

Mass (kg) force (n) 5 25 10 50 15 75 20 100 a student was trying to find the relationship between mass and force. he placed four different masses on a table and pulled them using a spring scale. the table shows the different masses used in the experiment and the force required to pull each mass. the student concluded that more force was required to pull heavier objects. what comment would you make regarding his conclusion? a) no clear relation can be observed between mass and force from the data. b) there is a direct proportion between the mass and force listed in the table. c) gravity should have been taken into account while performing the experiment. d) there is an inverse proportion between the mass and force listed in the table.

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)