To make a secure fit, rivets that are larger than the rivet hole are often used and the rivet is cooled (usually in dry ice) before it is placed in the hole. a steel rivet 1.870 cm in diameter is to be placed in a hole 1.868 cm in diameter in a metal at 25°c. to what temperature must the rivet be cooled if it is to fit in the hole? express your answer using two significant figures.

For a final project in seon’s physics class, students were instructed to build a water balloon launcher, write a hypothesis, and then carry out an experiment with the launcher. considering that 90 degrees means launching the balloon straight up into the air and 0 degrees means launching it straight along the ground, seon first wrote the hypothesis below.if the angle at which the balloon is launched decreases from 90 degrees, then the distance that the balloon goes along the ground will increase, because more energy will go into pushing the balloon forward than upward.seon found that this was true until the angle reached about 45 degrees, and then the distance along the ground began to decrease again. seon knows that he will need to write a new explanation, but he would like to conduct an experiment that is based on his original hypothesis, with one of the variables changed.how could seon rewrite his hypothesis to be a statement that will  more likely  be supported? change the independent variable to “if the angle at which the balloon is launched increases up to 90 degrees . .”change the dependent variable to “if the angle at which the balloon is launched moves closer to 45 degrees . .”change the independent variable to “if the angle at which the balloon is launched moves closer to 45 degrees . .”change the dependent variable to “if the angle at which the balloon is launched increases to 90 degrees. .”