Please show work 3. You find experimentally that a meter stick balances on your
ID: 1292404 • Letter: P
Question
Please show work
3. You find experimentally that a meter stick balances on your right-hand index finger at the 50.7-cm mark. Once balanced, you use your left-hand index finger to exert a force of 0.23 N at the 33.0-cm mark. (a) What is the location of the axis of rotation of the meter stick? (b) What is the moment arm of the force you exert with your left-hand index finger about the axis? (c) What is the magnitude of the torque this force exerts? (d) What mass (in grams) would you have to place at the 33.0-cm mark on the meter stick to result in the same torque as that exerted by your finger?
7. A 210-g meter stick is nailed to a wall at its 30-cm mark. The meter stick is free to rotate about this nail (it is not nailed tightly!). Three forces of magnitudes F1 = 5.3 N, F2 = 7.5 N and F3 = 12 N act as shown in the figure, with ?2 = 35? and ?3 = 79?. Let the positive direction of rotation for torques be CW. Find (a) the moment arm for the force F1. (b) the moment arm for the force F2. (c) the moment arm for the force F3. (d) the torque exerted by F1 about the axis of rotation. (e) the torque exerted by F2. (f) the torque exerted by F3. (g) What is the torque exerted by the meter stick
Explanation / Answer
a) would be about your other finger so 50.7 cm
b)moment arm = 0.507-0.33 = 0.177 m
c)torque = r F = (0.507-0.33)*0.23= 0.0407 Nm
d)F = m g
m = 0.23/9.81=0.0234 kg = 23.4 g
7)Need the figure