Students are designing a balloon-powered car to test the effect of wheel size on the speed of the car. The size of the balloon is kept constant In each trial. The results of three trials are shown in the chart. Large Wheel Car Small Wheel Car Small Wheel Distance (m) Time (s) 5.0 20.8 Large Wheel Distance (m) Time (s) 5.0 17.1 Trial 1 Trial 2 Trial 3 5.0 21.1 5.0 16.8 5.0 20.9 5.0 17.0 What is the average speed for the small- and large-wheeled cars? A 0.2 m/s (small), 0.3 m/s (large) C. 4.0 m/s (small), 5.4 m/s (large) B. 0.7 m/s (small), 0.9 m/s (large) D. 100.0 m/s (small), 85.0 m/s (large)

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.

the answer is a! (2.9 x 10^-18 j) hope i could someone. : )

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.