Chemistry, 12.07.2019 17:00 naomicervero

Asprinter set a high school record in track and field, running 200.0 m in 21.9 s. what is the average speed of the sprinter in kilometers per hour?

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Answer from: deeanna20

- The average speed of sprinter is $32.9\frac{km}{hour}$ .

Solution:- From given data, distance covered by the sprinter is 200.0 m and it takes 21.9 seconds. We know that:

$speed=\frac{distance}{time}$

Let's plug in the values and calculate the speed.

$speed=\frac{200.0m}{21.9sec}$

$speed=9.13\frac{m}{sec}$

It wants speed in kilometer per hour. So, let's do the unit conversion as:

1000 m = 1 km

60 sec = 1 min

60 min = 1 hour

The set up looks as:

$9.13\frac{m}{sec}(\frac{1km}{1000m})(\frac{60sec}{1min})(\frac{60min}{1hour})$

= $32.9\frac{km}{hour}$

So, the average speed of the sprinter is $32.9\frac{km}{hour}$ .

Answer from: Quest

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

Answer from: Quest

For cyclohexane compounds drawn in a chair conformation: -axial bonds are vertical -equatorial bonds are parallel to two bonds within the ring. thus, as i assume the chair conformation is drawn: -the x group is in an axial position, as are the five other vertical bonds. -three axial bonds are on the top face of the ring -the other three axial bonds are on the bottom face the position of the second substituent on each ring carbon is equatorial. gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other. drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1. click this link and watch some academic videos that may you more understand the topic

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Asprinter set a high school record in track and field, running 200.0 m in 21.9 s. what is the averag...