Recent content by munther

A wrench 30cm long lies along the positive y-axis and grips a bolt in the origin. A force is applied in the direction < 0; 3; -4 > at the end of the wrench. Find the magnitude of the force needed to supply 100J of torque to the bolt. how can i solve it? r=<0,.3,0> F=<0,3,4> T= r X F...

A wrench 30cm long lies along the positive y-axis and grips a bolt in the origin. A force is applied in the direction < 0; 3; -4 > at the end of the wrench. Find the magnitude of the force needed to supply 100J of torque to the bolt. how can i solve it? r=<0,.3,0> F=<0,3,4> T= r X F...

thanks i posted it ...but it is wrong! (879.844-648.9)/(879.844)=26.2% xxx Wrong xxx ! why??

ok d= .5xgxt1 = 343t2 t1+t2 =13.4 by solving both equations t1= 11.51 t2= 1.89 then the depth = 648.9 m is it right next step: %=(depth1-depth2)x100/(depth1) we found one depth the second depth when we ignored the time is the second depth when time = 13.4 for the...

ok that is very good then how i will divide the time between the falling and the echo

sorrry the distance = 1/2 a t^2 = .5 x 9.8 x (13.4/2)^2 = 219.961 m^2 that is when i take the time into account but how i will not take it??

A stone is dropped into a deep canyon and is heard to strike the bottom 13.4 s after release (the speed sound is 343m/s) What would be the percentage error in the depth if the time required for the sound to reach the canyon rim were ignored? I found the depth of the canyon =2298m then what...

i found it from the first part of the question

Thank you > but Why?? can you give me a hint??

in my homework the question wants from me to find the moment of inertia of right triangle with the y-axis as shown in the attatchment note: the mass of the plate is 1 kg i found the y coordinate of the center of mass of the plate it is 5/3 and i supposed it is the r so the inertia...