spathok

A uniform 25.0 kg plank has a length of 3.00 m and rests on two supports that are 0.50 m from each

end, as shown in the figure. A uniform 15.0 kg block is placed on the plank with its center of mass

at a horizontal distance of 1.25 m from the right-hand end of the plank. The origin of the Cartesian

coordinate system is at the left support point.

(a) Draw a free-body diagram for the plank. Write down the y-component of the net force on the

plank. Using Newton’s first law, obtain a constraint on the magnitudes of the two normal

forces on the plank exerted by the two supports.

(b) Calculate the net torque on the plank due to the two supports, the weight of the plank, and the

weight of the block. Using the rotational version of Newton’s 1st law, obtain a second

constraint on the magnitudes of the two normal forces on the plank exerted by the two

supports. Explain why the origin of the coordinate system was placed at the position of one of

the support points instead of at some arbitrary point on the plank.

(c) Solve the two simultaneous equations in parts (a) and (b) to obtain the two normal forces on

the plank exerted by the two supports. Which of the two supports exerts the larger normal

force on the plank? Does this make sense? Explain.

Who's Tobi?

Cause Madara got brought back to life?!

All of the following statements are true about the normal distribution except:

A. The normal distribution is a mathematical model of a population distribution.

B. The normal curve crosses the x-axis at z-scores above 3.0 and below -3.0.

C. The proportion of observations two standard deviations above the mean is the same as the proportion two standard deviations below the mean.

D. The total area under the normal curve is one.

E. Values located on the normal curve are not meant as actual observations.

I think it's A or E.

A, I'm thinking it can work for a sample too.

But E could be right or wrong.

i've never had a question answered before.

what is your favorite manga?