The answer is 3/4 because 0.7= 7/10. To have the same denominator, multiply the fraction by the other denominator. ( 4 is the denominator of the other fraction.) 7x4=28 10x4=40 so it's equal 28/40 Do the same thing for the other fraction. ( 10 is the denominator.) 3x10=30 4x10=40 so it's equal 30/40 We have the same denominator now so we can just compare it. 28/40 < 30/40
Just has to be greater than or equal to 0... w and t can never be negative since taking the square root of a negative number yields an imaginary number which would mean imaginary current. Also the question states that w can't be zero but if T is zero than the current will be zero.
