Solution:
a) We know acceleration due to gravity, g = GM/r²
Differential change, dg/dr = -2GM/r³
Here, r = 50*Rh = 50*2GM/c² = 100GM/c
²
My height, h=dr = 1.7 m
Difference in gravitational acceleration between my head and my feet, dg = -10 m/s²
or, dg/dr = -10/1.7 = -2GM/(100GM/c²)³
or, 5.9*100³*G²*M² = 2c⁶
or, M = 0.59*c³/(1000G) = 2.39*1032 kg = [(2.39*1032)/(1.99*1030 )]Ms = 120*Ms
Mass of black hole which we can tolerate at the given distance is 120 time the mass of Sun.
b) This limit an upper limit ,we can tolerate smaller masses only.
Answer: a tadpole is the first or second step into the evolution for a frog
Explanation: a frog starts with the egg then it becomes a tadpole for 6 to 12 weeks before it can start going out the water.
It's average speed during that 26 seconds was about 4.77 m/s. Without seeing the graph, we can't tell if it was going faster or slower at any particular time during that period. All we can tell is its average for the full interval.
Answer: The correct answer is "It has increased surface levels of ultraviolet light".
Explanation:
Ozone depletion: The ozone layer in the atmosphere protects the earth's surface from the exposure of the harmful radiation but due to the hole in the ozone layer, the harmful radiation is reaching our earth's surface.
The ultraviolet radiation is very harmful radiation. It can cause skin cancer and eye cataract.
When the ozone layer is hit by the ultraviolet radiation then ozone will break into oxygen molecule and oxygen atom. Oxygen atom is unstable then it will react with another oxygen molecule. In this way, the ozone layer is not damaged.
CFC (chloro fluoro carbon) is the pollutant which are responsible for the ozone depletion. Due to the depletion of the ozone layer, the surface levels of ultraviolet light has increased.
