Four +2 μc charges are placed at the positions (10 cm, 0 cm), (−10 cm, 0 cm), (0 cm, 10 cm), and (0 cm, −10 cm) such that they form a diamond shape centered on the origin. a charge of +5 μc is placed at the origin. if the force between a +2 μc and a +5 μc charge separated by 10 cm has a magnitude of 9 n, which of the following can we say about the force on the +5 μc charge at the origin in this case? four 2 charges are placed at the positions (10 , 0 ), (10 , 0 ), (0 , 10 ), and (0 , 10 ) such that they form a diamond shape centered on the origin. a charge of 5 is placed at the origin. if the force between a 2 and a 5 charge separated by 10 has a magnitude of 9 , which of the following can we say about the force on the 5 charge at the origin in this case? a. the force on the charge at the origin is 18 n. b. the force on the charge at the origin is 36 n. c. the force on the charge at the origin is 0.d. the force on the charge at the origin is 9 n.

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?