Three point charges are arranged in an equilateral triangle. the bottom left charge is located at the origin (0.000 m, 0.000 m) and has a charge of +3.00 µc, the bottom right charge is 20.0 cm away at (0.200 m, 0.000 m) and has a charge of −2.00 µc, and the top charge is located at (0.100 m, 0.173 m) and has a charge of +4.00 µc. find the electric field vector (magnitude and direction! ) at the origin, and then use it to calculate the force on the +3.00 µc charge located there.'

Your starship, the aimless wanderer, lands on the mysterious planet mongo. as chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 km ; and there is no appreciable atmosphere on mongo. (a) the starship commander, captain confusion, asks for the following information: what is the mass of mongo? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?

How many astronauts have walked on the moon?

The molecular mass of a gas is (select all that apply) a. independent of the type of gas b. the same number as the atomic (or molecular) mass, but measured in grams c. dependent on the temperature d. the mass of a mole of the gas