19) Oxygen condenses into a liquid at approximately 90 K. what temperature, in A)-217 F B)-297 D) -193F C) -263-F 20) What is the weight of water displaced by a 100-ton loating ship? A) more than 100...

19) Oxygen condenses into a liquid at approximately 90 K. what temperature, in A)-217 F B)-297 D) -193F C) -263-F 20) What is the weight of water displaced by a 100-ton loating ship? A) more than 100 tons B) 100 tons C) 100 cubic meters D) less than 100 tons E) depends on the ship's shape 21) A temperature change of 20 "C corresponds to a temperature change of A) 36 F B) 68°F C) 11'F. D) none of the above 22) A glass rod is rubbed with a piece of silk. During the process the glass rod acquires a positive charge and the silk A) remains neutral. B) could either be positively charged or negatively charged. It depends on how hard the rod was C) acquires a negative charge. D) acquires a positive charge also. rubbed 23) When heat is added to boiling water, its temperature decreases C) does not change. A) increases 24) The moderate temperatures of islands throughout the world has much to do with water's A) vast supply of internal energy. B) absorption of solar energy C) high specific heat D) high evaporation rate. E) poor conductivity 25) A rock suspended by a string werighs 5 N out of water and 3 N when submerged. What is the buoyant force orn the rock? A) 2N B)5N C) 8 N D) 3 N E) none of these 26) The heat required to change a substance from the solid to the liquid state is referred to as the A) latent heat of vaporization. C) latent heat of melting B) latent heat of fusion. D) latent heat of freezing.