Answer:
100 times brighter
Explanation:
The apparent luminosity of a star follows the inverse square law, which means that the luminosity is inversely proportional to the square of the distance:
where r is the distance.
In this problem, star A and star B have same intrinsec luminosity, but star B is 10 times farther than star A:
We can write the luminosity of star A as follows:
While the luminosity of star B will be:
Substituting :
So, star A will appear 100 times brighter than star B.
D only kinetic energt because if it had heluim or any thing jt will float up
Answer:
Rusting of iron is slow in desert area because rusting happens when iron articles react with atmospheric oxygen and moisture and produced a substance called rust. in desert areas there is less moisture in air as compared to coastal area therefore rusting is slow.
Answer:
a) p = 95.66 cm, b) p = 93.13 cm
Explanation:
For this problem we use the constructor equation
where f is the focal length, p and q are the distances to the object and the image, respectively
the power of the lens is
P = 1 / f
f = 1 / P
f = 1 / 2.25
f = 0.4444 m
the distance to the object is
the distance to the image is
q = 85 -2
q = 83 cm
we must have all the magnitudes in the same units
f = 0.4444 m = 44.44 cm
we calculate
1 / p = 0.010454
p = 95.66 cm
b) if they were contact lenses
q = 85 cm
1 / p = 0.107375
p = 93.13 cm