xvxvxv

Thank you alan 

its really helpful . 

No I didn't get it . 

My question was how did he know that the torque exerted by the motor is in opposite direction of Tb,Tc and Td ? 

Thank you  Alan .. You are the best . 

Any one?  

Thank you Alan .

why ? where was he ? 

\(A = 6x^2\)

\(6x^2 = 54 cm^2 \)

\(x^2 = 9 \)

\(x=3 cm \)

so the length of the cube is 3 cm . 

\(v = x^3 \)

\(v = 3^3 \)

\(v = 27 cm^3 \)

You can solve this as an equation in one variable.

1-) The question say that Kelly had 3/5 as many jellybaens as Lynn.(Suppose that Lynn had y Jellybeans ) , so kelly had

3/5y jellybeans. 

2-) After Lynn gave Kelly 3/5 of her jellybeans, now Kelly had ( 3/5y+3/5y ) . 

3-)  Kelly had 160 more than Lynn .  so the equation now become  3/5y+3/5y = 160 + y 

solve this equation to find the value of y which represent how many jellybeans lynn had. 

3/5y+3/5y = 160 + y 

6/5 y = 160 + y 

1/5 y = 160 

y = 800 

so Lynn had 800 jellybeans . 

and we know that Kelly had 3/5 as many as Lynn , so 

Number of Kelly's jellybeans = 3/5*800 = 480 jellybeans . 

Lynn had 800 jellybeans 

Killy had 480 jellybeans 

The total jellybeans is 800+480 = 1280 . 

On the first day, he read  1/5 of the book, so the remaning is 4/5. 

On the second day, he read 75% from the remaning (4/5), so 0.75*4/5 = 3/5.

so now he read 1/5 + 3/5 = 4/5 of the book.

the remaning is 1/5, and the question say that he had 75 pages left, so 1/5 of the book = 75 pages 

and now you can solve this as an eqation 

1/5x = 75 

x= 375

so the book contain 375 pages . 

hope this is helpful 

in the normal stress, the tensile force will divided by 2 because there are two links.

 right ?