Question

Estimate the average speed,in m/s,with which tge hair on your head grows. Make this estimate from your own experience nothing, for instance,how often you cut your hair and how much you trim. Express your result in scientific notation.

Answer 1

My estimate is 1/2 inch per week.

     (0.5 inch/wk) x (1 wk / 7 da) x (1 da / 86,400 sec) x (1 meter / 39.37 inches)

 =     (0.5 x 1 x 1 x 1) / (7 x 86,400 x 39.37)        meter/second

 =               1 / 47,621,952  meter/second 

 =                  0.0000000209987...  m/s

 =                2.1 x 10⁻⁸  meter/second

 =                2.1 x 10⁻⁵ mm/sec

 =                0.000021 millimeter per second  (rounded)

Answer 2

The scientific notation of hair on your head grows of average speed is $3.8*10^{-9} m/s$

Further explanation

Scientific notation is expressing numbers that are too big / too small to be conveniently written in decimal form. Scientific notation is commonly used by scientists, mathematicians and engineers, because it can simplify arithmetic operations.

Speed is one time velocity measurement, while average speed is the median measurement of different speeds that basically used to simplify the varying speed to appear like a single speed only

Every people have different the average speed, in m/s, with which the hair on the head grows. The examples are

Example one:

I cut my hair every month and it's about 1 cm just before cutting it

$v=\frac{1*10^{-2}}{30*24*60*60s}=3.8*10^{-9} m/s$

Because one month equal to 30*24*60*60 second

Example two:

I have not cut my hair since 10 months. My hair has grown about 12 cm in 10 months. Therefore

$v= \frac{12cm}{10 months} = \frac{12*10^{-3}m}{10*30*24*60*60s} = 4.629*10^{-10} m/s$

Hope it helps!

Learn more

1. Learn more about the average speed brainly.com/question/864530
2. Learn more about scientific notation. brainly.com/question/11239995
3. Learn more about hair grow brainly.com/question/11392207

Answer details

Grade: 9

Subject: physics

Chapter:  the average speed

Keywords: the average speed, hair, head, trim, scientific notation,