The Moon was once closer to Earth, but the force of gravity got weaker as the Moon moved farther away.The law of conservation of angular momentum ensured that the Moon must have the same amount of rotational angular momentum as it has oforbital angular momentum.
2/10/2021Homework #3 - Chapters 4 and 514/29In which of the scenarios below would you feel weightless?ANSWER:CorrectChapter 4, #23Part AThe net force applied to an object equals its ________ (Newton's 2nd Law of Motion).ANSWER:CorrectChapter 4, #24Part ARadiative energy is ________.ANSWER:CorrectChapter 4, #25Part AWhat does Erepresent in Einstein's formula E= mc2?ANSWER:while parachuting from an airplanewhile walking on the Moonwhile accelerating downward in an elevatorwhile falling from a roofmass times velocitymass times accelerationmass times energymomentum times velocityenergy from nuclear power plantsenergy of motionheat energyenergy carried by light
2/10/2021Homework #3 - Chapters 4 and 515/29CorrectChapter 4, #26Part ASuppose your mass is 70 kg on Earth. On the Moon what would be your mass?ANSWER:CorrectChapter 4, #27Part AConsider two objects with masses. According to the universal law of gravitationwe studied in class, if you double the masses of bothattracting objects,then the gravitational force between them willANSWER:CorrectChapter 4, #28Part Athe gravitational potential energy of an object held above the groundthe kinetic energy of a moving objectthe electric field produced by a chargethe mass-energy, or potential energy stored in an object's massthe radiative energy carried by light70 kg12 lb70 lb12 kg50 kgdecrease by a factor of 4.decrease by a factor of 2.increase by a factor of 4.increase by a factor of 2.not change at all.
2/10/2021Homework #3 - Chapters 4 and 516/29If a planet is orbiting a star, which is correct about the gravitational forces and acceleration experienced by the planet and the star?ANSWER:CorrectChapter 4, #29Part AWhich of the following statements best describes why a rocket goes up after being launched?ANSWER:CorrectChapter 4, #30Part AWhy do astronauts on the space shuttle in low Earth orbit feel weightless?ANSWER:CorrectChapter 4, #31Part AMany comets have highly elliptical orbits around the Sun. Where in its orbit around the Sun is a comet moving the slowest?ANSWER:The acceleration of the planet is much more than the acceleration of the star, but the force on the star is the same but opposite the force on theplanet.The acceleration of the planet is much more than the acceleration of the star, and the force on the planet is much more than the force on thestar.