A physicist found that a force of 0.72 N was measured between two charged spheres. The distance between the spheres was 0.90 m. Calculate the force between the two spheres when the distance was decreased to 0.50 m. F2 = .

A) 1.7 N
B) 1.3 N
C) 2.3 N
D) 2.6 N
Please work it out

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

What does the law of conservation of mass state?

On a frictionless air track, a blue glider with mass 0.200 kg is moving to the right with a speed of 8.00 m/s. it strikes a red glider that has mass 0.600 kg and that is initially at rest. after the collision, the blue glider is moving to the left with a speed of 3.00 m/s.(a) what are the magnitude and direction of the velocity of the red glider after the collision? (b) is this collision elastic?