Four pairs of objects have the masses as described below, along with the distances between
them. Which pair of objects would have the greatest gravitational force between them?*

Mass of 1Kg and 1kg, 2 meters apart
Mass of 1Kg and 2Kg, 1 meters apart
Mass of drukg and 1 Kg, 12 meters apart
Mass of 2 Kg and 1kg, 12 meter apart

In an experiment, how can i change human errors? be specific.

What are the similarities & differences between a thermistor and a light dependent resistor in physics?

Aball is thrown from the top of a building with an initial velocity of 21.9 m/s straight upward, at an initial height of 51.6 m above the ground. the ball just misses the edge of the roof on its way down, as shown in the figure. (a) determine the time needed for the ball to reach its maximum height. (b) determine the maximum height. (c) determine the time needed for the ball to return to the height from which it was thrown, and the velocity of the ball at that instant. (d) determine the time needed for the ball to reach the ground. (e) determine the velocity and position of the ball at t = 5.35 s.