How does increasing the amount of charge on an object affect the electric force it exerts on another charged object?

a. the electric force increases because the amount of charge has an indirect relationship to the force.

b. the electric force increases because the amount of charge has a direct relationship to the force.

c. the electric force decreases because the amount of charge has an indirect relationship to the force.

d. the electric force decreases because the amount of charge has a direct relationship to the force.

Askydiver weighing 140 lb (including equipment) falls vertically downward from an altitude of 19,000 ft and opens the parachute after 18 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.55|v| when the parachute is closed and is of magnitude 14|v| when the parachute is open, where the velocity v is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. (a) find the speed of the skydiver when the parachute opens. (b) find the distance fallen before the parachute opens. (c) what is the limiting velocity vl after the parachute opens? (d) determine how long the sky diver is in the air after the parachute opens. (e) plot the graph of velocity versus time from the beginning of the fall until the skydiver reaches the ground.

In a stagnant pool of water, a crayfish may spend much of its time lying with one side of its carapace near the surface of the water. in this position, it will move the walking legs on that side in a rhythmic back-and-forth motion. explain the likely function of this behavior.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.