SPH301 Dynamics
6. A string is tied to a 3.2 kg object on a table and a 1.5 kg object hanging over a pulley. The
coefficient of kinetic friction between the 3.2 kg object and the table is 0.30.
a. Calculate the acceleration of each object. (Ans: 1.1 m/s? [R], 1.1 m/s? [Down])
b. Determine the magnitude of the tension in the string. (Ans: 13 N)
c. How far will the objects move in 1.2 s if the initial velocity of the 3.2 kg object is 1.3 m/s
[right]? (Ans: 2.4 m)
3.2 kg
1.5 kg

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?