Let's Look at the Speed Measured in Mach Value

Mach is a unit of measuring the speed of sound in a given medium; a plane traveling at .2 Mach moves at only two-tenths the speed of sound, while Mach 1 is equal to it. (The speed of sound is about 758 miles (1,220 kilometers) per hour at sea level, and decreases with altitude.) As [your moving object-maybe an air plane accelerates to Mach 1.06, controllers on the ground heard the first sonic boom. (The end of a bullwhip moves faster than the speed of sound. Some say the "crack" is a small sonic boom.)
It has been a long time since I studied this physics--Looking at it again gives it new meaning.

If you can't read the image it is: M=v/vsound

M is the Mach number,

v is the velocity of the source relative to the medium, and

vsound is the speed of sound in the medium.

From Wikipedia en,  Mach number varies by the composition of the surrounding medium and also by local conditions, especially temperature and pressure. A vapor cone is typically observed as an aircraft, or object, approaches transonic velocity.

Ladderback Shawl

I love this treble crochet shawl, it is extra long and with multiple ties you can create several looks including cowl and hood looks, a tiny snowman is sewn on one end. This uses white and silver holiday yarn. It is about 70 90 inches long.

Cast on 164 x2=328 stitches or enough so length is 90 inches with stretched very slightly and the width is going to be 12 inches when slightly stretched if you make it 10 rows wide. It would probably be even more beautiful if you added two more rows for a total of 12 rows, bigger than this might be overwhelming although and reminiscent to a blanket. To check gauge cast on about 10 stitches and chain into the 4th chain from hook, skip a stitch triple crochet into next stitch, skip one stitch, triple crochet, skip one, Triple crochet once more which will be equal to 4 triple crochet and 2.25"

I will update this post with the placing of the string ties asap. There will be 6-8 inch fringe ends on both edges or ends lengthwise and pom pom embellishments on the tie ends, mine only has two pom poms but it really needs to have four, one pair for each set of ties at the neckline.

Fringe ends are looped and pulled through with a crochet hook, I will include a link for this asap.

Striped Sport Yarn in a Brightly Colored Sweater

To begin with  this sweater uses size 7 needles and sport weight yarn.

 The cuffs are done in a heavier weight worsted in a bronze shade of brown, while the body is worked in stripes of deep cocoa brown or chocolate, turquoise and jockey or cherry red, your preference, all done on size 7 American needles.

It turns out really pretty.

It is about 23 inches long and the bottom is also finished in the bronze-ier brown shade the trim is approximately 1 1/8 inches.

The stripes are about 3.5 inches for each shade and the neckline is a modified jewel/boatneck finished in single crochet. Cap sleeves gathered and eased into a set-in silouhette finish it off. Sleeves are a little long at 22 inches.

Here it is scanned.

The turquoise is a little unique so it is fun to wear. It is stretchy and soft, it is only red heart sport weight. It is also fun to mix purple with red, cream amd black.

Cast on 76 to begin the rib trim for the body, work a little more than one inch in one by one ribbing, change to a color in front and back increasing 10 stitches by the time you reach the armholes, bind off 6 on each side of piece in front and 5 in the back. The stripes will begin every 3.5 inches in a varying color.
Arms: Cast on 36 in the bronzeier brown also work a little greater than one inch in one by one rib. You will need to total 56 stitches as you work up the sleeve, do this by increasing (56-36=20) 4 stitches every color change, also every 3.5 inches to match the body's stripes as exactly as you can. You will be changing colors 5 times from cuff until armhole bind off. Bind off five stitches over two rows (=46 remaining) than bind off 12 stitches during each color on the edges, the first two colors = 22 stitches remaining, now you are to the final cap area and third color beginning at which you can taper to about 18 stitches or your preference to create a slight gathering to set-in to your garment's body.
For neckline cast off 22 in front working up to shoulder and casting off a few more on each side as desired until achieving about 2.5 inches in length and then bind off shoulders. In back cast off 32 plus two more on each side before completing approximately 11/4 inches length and then bind off shoulders.

A Little Craziness~