Answer:
1.254 cm
Explanation:
(3.8 * 10^-2 cm) = 0.038 cm
(4.4 * 10^-2 cm) = 0.044 cm
(7.5 * 10^2 cm) = 750 cm
0.038 * 0.044 * 750 = 1.254 cm
The correct answer would be A.The acceleration of gravity is <span>9.81 m/s^2. This is calculated by using the equation:
a = GM/r</span>²
where G is the gravitational constant 6.6726 x 10-11N-m2/kg2, M is the mass of the planet (<span>5.9736E+24 kg) and r is the radius of the planet.
</span>
Answer:
B. 500 years
Explanation:
The light coming from the star and reaching us on the Earth travels with uniform motion (with constant velocity), so we can use the equation of uniform motion which relates distance covered, speed and time taken:

where
v is the speed
d is the distance covered
t is the time taken
In this problem:
is the speed at which light travels
is the distance that light has to cover from the star to the Earth
Therefore, by rearranging the equation, we can find the time:

And by converting into years, this time is

So, approximately 500 years: this means that the image we see of the star is 500 years old.
Answer:
= 0.0050 M
= 0.0155 M
Explanation:
Initial moles of
= 0.072 mole
Volume of container = 3.9 L
Initial concentration of
The given balanced equilibrium reaction is,

Initial conc. 0.018 M 0
At eqm. conc. (0.018-x) M (2x) M
The expression for equilibrium constant for this reaction will be,
![K_c=\frac{[I]^2}{[I_2]}](https://tex.z-dn.net/?f=K_c%3D%5Cfrac%7B%5BI%5D%5E2%7D%7B%5BI_2%5D%7D)

we are given : 
Now put all the given values in this expression, we get :


So, the concentrations for the components at equilibrium are:
![[I]=2\times x=2\times 0.0025=0.0050](https://tex.z-dn.net/?f=%5BI%5D%3D2%5Ctimes%20x%3D2%5Ctimes%200.0025%3D0.0050)
![[I_2]=0.018-x=0.018-0.0025=0.0155](https://tex.z-dn.net/?f=%5BI_2%5D%3D0.018-x%3D0.018-0.0025%3D0.0155)
Hence, concentrations of
and
are 0.0050 M ad 0.0155 M respectively.