what allows us to stand upright and keeps us from falling through the ground? a. while gravitational force pulls us down, the opposing force from the ground pushes up and balances out the two forces b. the force of gravity is stronger than the force of the ground pushing up on us c. while gravitational force pulls us down, the ground is pulling us down d. the force of the ground pushing up on us is stronger than the force of gravity

Four point charges each having charge q are located at the corners of a square having sides of length a. find symbolic expressions for the following. (a) the total electric potential at the center of the square due to the four charges (use any variable or symbol stated above along with the following as necessary: ke.) vtotal= (b) the work required to bring a fifth charge p from infinity to the center of the square (use any variable or symbol stated above along with the following as necessary: w=

What quantity do units represent in value

Smallest intensity of a stimulus that you can detect 50 percent of the time is