Samantha believes that flowering plants produce more flowers when they are given fertilizer. She designs an experiment in which three rose bushes are each given 100 grams of a different type of fertilizer. She observes the plants for four weeks and records the number of roses each bush produces. What element of experimental design is missing from Samantha’s experiment? *A. Control, B. a hypothesis, C a dependent variable, D. Independent variable

Which type of stress results when two plates push against one another? a. compression b. tension c. force d. shear

Drag each number to the correct location on the equation. each number can be used more than once, but not all numbers will be used. balance the equation with the coefficients. 2 3 4 5 kclo3 -> kcl + o2

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.