Which choice can be correctly defined as "the sum of all charge in a closed system remains constant"?

law of conservation of energy

law of conservation of mass

law of conservation of momentum

law of conservation of charge

Josh walks 1,000 meters along a straight southerly path to the grocery store. Upon reaching the store, he realizes that he forgot his money and returns home (along the same path) to get it.

How did Thomson know atoms had an overall neutral charge? He knew there were negative electrons but he came to the conclusion that the rest of the atom was positively charged, why was this? How did he know it would be positively charged?

What type of force is drag? A) Net Force B) Applied Force C) Frictional Force D) Gravitational Force

Coulomb's law predicts that charged bodies may attract or repel each other. true or false

Kevin, whose mass is 80 kg, is moving along at a velocity of 4 m/s. He doubles his velocity by going down a hill. How much kinetic energy does he have after going down the hill? J

If you are trying to balance a seesaw and you have a higher mass on the left, should the mass on the right be placed at a greater distance or lower distance to balance it? Why?

A car travels 300 km in the first 3 hours of a trip. Then it hits traffic and travels only 60 km during the last hour. What is the average speed of the car? a.) 180 km/h b.) 100 km/h c.) 90 km/h d.) 120 km/h

What is the purpose of using a wedge? A. separates objects B. keeps objects together C. allows you to exert force over a distance

Echolocation is an acoustic principle in which some wildlife use resonance to find food at night. Question 25 options: True False

Use the drop-down menus to identify the variables for the second hypothesis. Hypothesis #2: As you build circuits, you will alter resistance, which is the y variable.