Abarbell is 1.5 m long. three weights, each of mass 20 kg, are hung on the left and two weights of the same mass, on the right. the width of each weight is 4 cm and each group of weights is placed 4 cm from the ends. where is the center of mass of the barbell as measured from the mid-point, m, of the bar? the bar is of uniform mass and has mass 5 kg, and the retaining collars are of negligible mass. take to the right as positivea. -5.90cmb. -11.6cmc. +13.7cmd. +5.90cme. none of the above

b. -11.6 cm

Explanation:

We have given parameters:

Length, l = 1.5 m = 150 cm

Mass of weight, = 20 kg

Width, x = 4 cm

Distance d = 4 cm

Mass of bar, = 5 kg

We are asked to find the center of mass from the mid-point,

Since 3 weights are on the left and 2 weights are on the right, we know:

= 3 * 20 = 60 kg

= 2 * 20 = 40 kg

And also we know that, = 150/2 = 75 cm

For the left side, center of mass is:

cm

From the midpoint, the distance to the left is:

cm

For the right side, center of mass is:

cm

From the midpoint, the distance to the right will be:

cm

Hence,

cm

i believe the answer would be:

d. violin, clarinet, french horn, and tuba