Recent content by xlaserx7

Homework Statement A magnetic tape is being played on a cassette deck The tension in the tape applies a torque to the supply reel. Assuming the tension remains constant during playback,discuss how this torque varies as the reel becomes empty. Homework Equations The Attempt at a...

so do i use the center of gravity for each one as the lever arm?

Homework Statement a person is standing on a level floor. His head , upper torso , arm , and hand together weigh 438N and have a center of gravity that is 1.28 m above the floor. His upper legs weigh 144N and have a center of gravity that is .760 m above the floor. Finally, his legs and feet...

ohhh thanks! i understand

Two people of different weights are sitting on a seesaw. The seesaw is not rotating. How would the lever arm of the heavier person compare with the lever arm of the lighter person?

Homework Statement What is the relationship between the counter clock wise torque and the clock wise torque when the system is in equilibrium? Homework Equations The Attempt at a Solution The counter clock wise has a positive value and clock wise has a negative value. The negative and positive...

ahhh ok thanks

what?? why1? is it because the force has to be perpendicular to the center of rotation?

1. Homework Statement what is the relationship between the magnitudes of the forces exerted and the lever arm distance over which the force were exerted? 2. Homework Equations 3. The Attempt at a Solution the force and distance are directly related because T (torque) = F times (lever arm)

ahh thank you

0 times 1.2 + .5 (-9.80)(1.44) = -7.056 gives me the height. full height is 7.056 times 2 = 14.112 now i am stuck again >.< wait... now i use v=vo + at to find the final so 0 + (-9.80)1.2 = 11.76 = final velocity then i use y = 1/2 ( v + v )t y = 1/2(0 + -11.76)1.2 y = -7.056...

i don't understand why can't i use v=vo + at and did i mess up on the time?

Homework Statement A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it taktes for the ball to fall halfway to the ground is 1.2s. Find the time it takes for the ball to fall from rest all the way to the ground Homework Equations v=vo + at The...