The experiment you did in lab is repeated, using a uniform metal bar that is 80.0 cm long instead of the meterstick. since the bar is uniform, its center of gravity is at its center. the new experiment uses different hooks for hanging the masses from the bar, with mhook = 5.0 g. as in the experiment you did in lab, x1 = 5.00 cm, m1 = 300.0 g, and xp = 25.0 cm. in the new experiment, you make the same measurements as in your lab and plot x versus 1 m2 + mhook . the line that is the best fit to your data has slope 2800 cm · g. what is the mass of the bar?

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?