Pluto orbits the sun at an average distance of 5.91 × 10^12 meters. pluto’s diameter is 2.30 × 10^6
meters and its mass is 1.31 × 10^22 kilograms.
charon orbits pluto with their centers separated by a distance of 1.96 × 10^7 meters. charon has
a diameter of 1.21 × 10^6 meters and a mass of 1.55 × 10^21 kilograms.
calculate the magnitude of the gravitational force of attraction that pluto exerts on charon. [show all
work, including the equation and substitution with units.]

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

Oxygen and nutrients are moved through the body by the: a. circulatory system c. lymphatic system b. digestive system d. reproductive system

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !