AP Physics C Mechanics Quiz
20 questions · no time limit
0:00
ENERGY AND MOMENTUM OF ROTATING SYSTEMS
Question 1 of 20
No time limit
Current
Answered
Flagged
Not seen
A beam of negligible mass is pivoted at its left end and lies initially horizontal. A weight W1=30 NW_1=30\,\text{N} hangs at r1=0.40 mr_1=0.40\,\text{m} from the pivot, and a second weight W2=20 NW_2=20\,\text{N} hangs at r2=0.70 mr_2=0.70\,\text{m} from the pivot, both on the same side. The weights act vertically downward, and the beam rotates in a vertical plane. At the instant shown, the beam remains horizontal so each weight produces a moment arm equal to its distance from the pivot. Ignore friction at the pivot and any other forces. The net torque about the pivot is the sum of the individual torques from the two weights. Using the given information, compute the net torque magnitude about the pivot at this instant.
YOUR PROGRESS
20
QUESTIONS
Ready when you are
Answer in any order. Your progress shows here as you go.
QUESTIONS
KEYBOARD
Pick an answer ABCD
Next question ↵→
Previous ←
Flag for review F
Answers save as you go · flagged questions come back at the end