Asmall planet having a radius of 1000 km exerts a gravitational force of 100 n on an object that is 500 km above its surface. if this object is moved 500 km farther from the planet, the gravitational force on it will be closest to : (a) 75 n(b) 71 n(c) 56 n(d) 50 n(e) 25 n

Ammonia enters the expansion valve of a refrigeration system at a pressure of 10 bar and a temperature of 18oc and exits at 6.0 bar. the refrigerant undergoes a throttling process. determine the temperature, in oc, and the quality of the refrigerant at the exit of the expansion valve.

The coulomb's law explains which of the following? select all the force between two charged objects is inversely proportional to the charge on each object. the force between two charged objects is directly proportional to the charge on each object. the force between two charged objects is directly proportional to the distance separating them. the force between two charged objects is inversely proportional to the square of the distance separat coulomb's law is similar to newton's 2nd law. if the force between two objects is f and the charge on both objects is doubled, the new force between the would now be 2f. if the force between two objects is 2f and the distance separating them is doubled, the new force between the objects would now o the be zf.

Which atomic model was proposed as a result of j. j. thomson’s work?