A uniform meter stick with a mass of 180 g is supported horizontally by two vertical strings, one at the 0-cm mark (with tension T1) and the other at the 80-cm mark (with tension T2). A small pentagonal object of mass = 50g is placed at the 60cm mark. Required:
a. Draw a picture showing all forces acting on the stick (do not forget the weight of the meter stick).
b. Calculate the tensions in the strings at the 0-cm and 80-cm mark by choosing the pivot point at T1.

An astronaut in space cannot use a scale or balance to weigh objects because there is no gravity. but she does have devices to measure distance and time accurately. she knows her own mass is 77.4 kg , but she is unsure of the mass of a large gas canister in the airless rocket. when this canister is approaching her at 3.50 m/s , she pushes against it, which slows it down to 1.30 m/s (but does not reverse it) and gives her a speed of 2.60 m/s . what is the mass of the canister?