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help with 1821 please...

Question: help with 1821 please...

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Help with 18-21 please

018 10.0 points 29° so peeds. e tires You weigh 690 N. What would you weigh if the Earth were six times as massive as it is and its radius were four times its present value? Answer in units of N. 019 (part 1 of 2) 10.0 points On the way to the moon, the Apollo astro- nauts reach a point where the Moons gravi- tational pull is stronger than that of Earths. Find the distance of this point from the -center-ef the Earth. The masses of the Earth and the Moon are 5.98% 1024 kg and 7.36 x 1022 kg, respectively, and the distance from the Earth to the Moon is 3.84 x 108 m. Answer in units of m. 020 (part 2 of 2) 10.0 points What would the acceleration of the astro- naut be due to the Earths gravity at this point if the moon was not there? The value of the universal gravitational constant is 6.672 x 1011 N m2/kg2 hout The Answer in units of m/s2 021 10.0 points 6 kg ss is A 84.4 kg man sits on the stern of a 6.8 m long boat. The prow of the boat touches the pier, but the boat isnt tied. The man notices his mistake, stands up and walks to the boats prow, but by the time he reaches the prow its moved 1.6 m away from the pier. Assuming no water resistance to the boats motion, calculate the boats mass (not count- ing the man). onal the Answer in units of kg. avi-

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