To screw a 2cm screw into the wall requires turning a screwdriver 17 times. For each turn of the screwdriver, your hand moves 15cm. What is the MA of the screw?
2006-08-26 04:12:50 · 4 answers · asked by R D 1 in Science & Mathematics ➔ Physics
I guess you're saying that the screw moves 2 cm per 17 turns. The MA of the screw alone can't be specified, since you input rotation and get translation. But the combination of screw, screwdriver and hand provides a radius of rotation so the input now is in terms of translation. MA can be computed either from the ratio of forces as in your formula, or the ratio of motion. Since each turn is 15 cm of hand motion, you input 15*17 cm to move the screw 2 cm, so the MA is 15*17/2, or 127.5.
2006-08-26 05:13:29 · answer #1 · answered by kirchwey 7 · 0⤊ 0⤋
Crikey thats going back a bit.
2006-08-26 04:19:11 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Don't know, but my shelf hasn't fallen down yet
2006-08-26 04:24:23 · answer #3 · answered by Anonymous · 0⤊ 0⤋
it fasten very tightly and strongly.
2006-08-26 04:19:42 · answer #4 · answered by loadstar 3 · 0⤊ 0⤋