# 4 Two students are debating their experiences on the surface of the Earth: Student 1: / know that the Earth has a magnetic field, and I know that it's attractive because compass needles are attracted to the North pole. The Earth also attracts my body toward its surface. Therefore, the downward "weight" force I feel must be a magnetic force. Student 2: No, gravity and magnetism are different kinds of forces. Gravity pulls objects with mass down toward the Earth's surface, but compass needles are pulled parallel to the surface due to the Earth's magnetism. And if weight were due to magnetism, wouldn't your body be attracted to other magnets, too? Do you agree or disagree with either or both of the students? Explain your reasoning.

After the Apollo 13 capsule swung around the Moon, the crew was able to speed up for the journey back to Earth by firing the Lunar Module (LM) descent engine.  a.True b. False Which of the following is the most natural sleeping position in zero gravity?     in a sleeping bag taped to any surface, with your arms floating out in front of your chest     floating in mid-air with your legs straight and your arms straight at your sides     flat on your back on the floor, with your arms resting on your chest     curled in a fetal position, floating in mid-air

According to Lunar Laser Ranging experiments the average distance L M from the Earth to the Moon is approximately 3.85 x 105 km. The Moon orbits the Earth and completes one revolution in approximately 27.5 days (a sidereal month). How can the mass of the Earth be calculated using the information above? Select the correct statements. Select one or more: a. Use Newton's third law. b. Use Coulombs law. c. Use Newton's second law. d. Use Newton's first law.