11. The weight of a cosmonaut circling around the earth in a spaceship is 280 N at a location where gravitational acceleration is 3.35 m/s². Compute his mass and weight at sea level on earth. 12. At sea level, the weight of a 31.13li rigid block of material is 43.7 lbf. The gravitational acceleration on the surface of moon is 12.95 ft/s². Compute (a) the mass on earth and on moon, (b) the density on earth and on moon, (c) the specific volume on earth and on moon, (d) the weight on moon and (e) the specific weight on earth and on moon, for this block of material. 13. A balloon carrying two 80 kgm people is released to float in air (Pair = 1.16 kgm/m³). The diameter of the balloon is 10 meters that is filled with a helium gas (Phelium = 0.29 kgm/m³). The buoyant force F, that pushes the balloon upward is expressed as F = Pair xgx Vballoon where: g = local acceleration of gravity V= volume of the balloon Compute the acceleration of the balloon when it is first released neglecting the weight of the cage and the ropes. 14. The temperature of a system is 55°C. Express this temperature in °F, K and °R.