Handwrit/e and show all steps

55 and 56 Law of Universal Gravitation 29. (I) At the surface of a certain planet, the gravitational acceleration g has a magnitude of 12.0 m/sz. A 24.0kg brass ball is transported to this planet. What is (a) the mass of the brass ball on the Earth and on the planet, and (b) the weight of the brass ball on the Earth and on the planet? 31. (II) Two objects attract each other gravitationally with a force of 2.5 x 1010 N when they are 0.25 m apart. Their total mass is 4.00 kg. Find their individual masses. 33. (II) Calculate the acceleration due to gravity on the Moon, which has radius 1.74 x 106 m and mass 7.35 x 1022 kg. 35. (II) Given that the acceleration of gravity at the surface of Mars is 0.38 of what it is on Earth, and that Mars' radius is 3400 km, determine the mass of Mars. 37. (II) A hypothetical planet has a mass 2.80 times that of Earth, but has the same radius. What is 9 near its surface? 39. (II) Calculate the effective value of g, the acceleration of gravity, at (a) 6400 m, and (b) 6400 km, above the Earth's surface