We are given
r = 0.6 m
n = 1.5
D = 0.6 m, R1 = 30 cm
R2 = 120 cm
We are asked to get the focal length and the distance of the focal plane from the lens
We use the formula
1 / f = ( n - 1) (1/R1 - 1/R2)
Substituting and solving for f
1/ f = (1.5 - 1) (1/30 - 1/120)
f = 80 cm
The focal length is 80 cm and the distance of the focal plane from the lesn is 80 cm - 30 cm = 50 cm.<span />
There is no figure, so I asume the angle of the rope is measured with respect to the horizontal direction.
If this is the case, then the magnitude of the tension is the hypothenuse of a right triangle, of which

and

(horizontal and vertical component of the tension) are the other sides, and

is the angle between T and

.
Therefore,

(the side of the triangle opposite to

) is given by the magnitude of the tension multiplied by the sine of the angle:
It is typically constructed and used by the geologists and seismologists. Thus, the global tectonic map is one of the important element that is to be remembered in order to remember the locations and the major features that are associated with the earth's crust
ヾ(≧▽≦*)o
Tornadoes can occur all over the place, but are most commonly occuring in Tornado Alley (it's in the central of the US, In places like Oklahoma and stuff)
This is the answer of your question