What would the acceleration of the astronaut be due to the earth's gravity at this point if the moon was not there? the value of the universal gravitational constant is 6.672 × 10−11 n · m2 /kg2 . answer in units of m/s 2 ?

Apositive rod is placed to the left of sphere a, and the spheres are separated. which best describes the spheres? sphere a is negative and sphere b is positive because protons from sphere a are attracted to the rod and move to sphere b. sphere a is negative and sphere b is positive because electrons from sphere b are attracted to the rod and move to sphere a. sphere a is positive and sphere b is negative because electrons from the rod move to sphere b and protons then move to sphere a. sphere a is positive and sphere b is negative because protons move from sphere b to the rod and also to sphere a.

An electron in an x-ray machine is accelerated through a potential difference of 1.00 × 104 v before it hits the target. what is the kinetic energy of the electron in electron volts?

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this