I received a 24/27 on a recent Algebraic Physics quiz, and the instructor does N
ID: 1552038 • Letter: I
Question
I received a 24/27 on a recent Algebraic Physics quiz, and the instructor does NOT post a key with correct answers afterwards, can someone here help me to answer these 3 questions correctly, for people who know, really Know! this will take you 1min or perhaps less. thank you-
1. Moment arm is:
A) curved distance from pivot to the line of action of a force
B) parallel distance from pivot to the line of action of a force
C) perpendicular distance from pivot to the line of action of a force
D) triangular distance from pivot to the line of action of a force
2. A person jumps off a diving board.
While in the air, the person pulls their arms and legs in, so as to rotate faster by:
A) decreasing moment of inertia
B) decreasing centrifugal force
C) increasing torque
D) increasing angular momentum
3. A pendulum is made by tying a mass to one end of a string while the other end is held in place.
The force that causes the mass to undergo circular motion is:
A) the full weight
B) the weight acting parallel to the string
C) the weight acting perpendicular to the string
D) the tension
Explanation / Answer
1.perpendicular distance from pivot to the line of action of a force.
2.increasing angular momentum
3.the tension