MT

solve Z^5 - 1 =0 where Z is a complex number

The angular speed of an automobile engine is increased at a constant rate from 1200rev/min to 3000rev/min in 12s. How many revolutions does the engine make in this 12s interval? I worked it out to be 25200 rev. Is that right?

How do I find tangential speed with just radius, time and angular acceleration?

The incomes in a certain lg. population of college teachers have a normal distribution with a mean of $35,000 and st. dev. of $5000. Four teachers are randomly selected. What is the probability their average salary will exceed $40,000?

I roll a pair of fair dice and compute the number of spots on the two sides facing up. Denote this total by X. The probability distribution of X is X Prob 2 1/36 3 2/36 4 3/36 5 4/36 6 5/36 7 6/36 8 5/36 9 4/36 10 3/36 11 2/36 12 1/36 The probability that...

1. In a study of heart disease in male federal employees, researchers classified 170 volunteer subjects according to their socioeconomic status (SES) and their smoking habits. SES categorized as high and low. Individuals were asked whether they were smoke...

Oh, I had to find it in rev/min^2.

Er, wait. That is probably wrong. I think I have to go back and convert a few things around.

Can I just do that when my radius is in radians?

My bad... I meant the angular acceleration - I was given rad/sec^2 as the units.

F=m*((v^2)/r) Therefore (18.1^2m/s)/80m*3800=F Therefore F=15561N

A) 0.79 B) 1.55