Objects 1 and 2 attract each other with an electrostatic force of 18 units. if the charge of object 2 is increased by a factor of 3 and the distance separating objects 1 and 2 is increased by a factor of 3, then the new electrostatic force will be units.

Explanation:

Electrostatic Force

We know particles 1 and 2 attract each other with an electrostatic force of 18 units. The force between two charged particles is given by Coulomb's formula

Where are the charges and r is the distance between them.

We are told the new charge 2 is

And the distance is three times the original

The new force is

Operating

This force is one third of the other one, so  

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray