All categories

2 years ago

Heather ran 100 meters in 20 seconds. What is her speed? Just type the number, no labels.

Chemistry

2 answers:

uysha [10]2 years ago

5 0

Her speed is 5

s=d/t. 100/20= 5

3241004551 [841]2 years ago

4 0

She ran at either 5m/s
Or 11.185 miles/hr

Explanation:
Aight well if she did 100m in 20s then that’s 5m/s which would also be 11.185M/h
m = meters
M = miles

Hope this helps!

You might be interested in

The convection that causes Earth's magnetic field happens in Earth's

aev [14]

Answer:

Earth's Core!

7 0

3 years ago

A shopping cart rolling down a hill for 8 seconds has an acceleration of 6.0 meters/second?. If the cart

Komok [63]

Answer:

51.0 meters/second is the final speed

6 0

3 years ago

Crystal lattice definition

Yanka [14]

A geometric arrangement of the points in space at which the atoms, molecules, or ions of acrystal occur. Also called space lattice. Hope this helps

5 0

4 years ago

how many molecules of sulfuric acid are in a spherical raindrop of diameter 6.0 mm if the acid rain has a concentration of 4.4 *

Vitek1552 [10]

Answer:

The number of moles =

$Moles=4.97\times 10^{-8}$

The number of molecules =

$Molecules = 2.99\times 10^{16}$

Explanation:

Volume of the sphere is given by :

$V=\frac{4}{3}\pi r^{3}$

here, r = radius of the sphere

$radius=\frac{diameter}{2}$

$radius=\frac{6.0}{2}$

Radius = 3 mm

r = 3 mm

1 mm = 0.01 dm (1 millimeter = 0.001 decimeter)

3 mm = 3 x 0.01 dm = 0.03 dm

r = 0.03 dm

("volume must be in dm^3 , this is the reason radius is changed into dm"

"this is done because 1 dm^3 = 1 liter and concentration is always measured in liters")

$V=\frac{4}{3}\pi 0.03^{3}$

$V=\frac{4}{3}\pi 2.7\times 10^{-5}$

$V=1.13\times 10^{-4}dm^{3}$

$V=1.13\times 10^{-4}L$ (1 L = 1 dm3)

Now, concentration "C"=

$C=4.4\times 10^{-4}moles/liter$

The concentration is given by the formula :

$C=\frac{moles}{Volume(L)}$

This is also written as,

$Moles = C\times Volume$

$Moles=1.13\times 10^{-4}\times 4.4\times 10^{-4}$

$Moles=4.97\times 10^{-8}$ moles

One mole of the substance contain "Na"(= Avogadro number of molecules)

So, "n" mole of substance contain =( n x Na )

$N_{a}=6.022\times 10^{23}$

Molecules =

$Molecule=4.97\times 10^{-8}\times 6.022\times 10^{23}$

$Molecules = 2.99\times 10^{16}$ molecules

7 0

3 years ago

What are the four phases of matter?

user100 [1]

Solid, Liquid, Gas, and Plasma

6 0

3 years ago

Read 2 more answers