Why ultraviolet light have more energy than the visible light
2 answers:
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#1
initial height = 25000 ft
as we know that
1 ft = 0.3048 m
so we have
H = 25000(0.3048) = 7620 m
#2
If mass of the man = 90 kg
now the initial potential energy is given as
#3
Gravitational force that is acting on it is given by
so this is the force by which earth is attracting him towards it as we can see due to this force the man is accelerating towards the earth
#4
As we know that gravitational force is given by
here we know that
r = R + h
R = radius of earth ()
h = 7620 m
now we have acceleration at that point is
#5
by energy conservation we have
#6
final speed due to wind resistance is 150 mph
now we know that
1 mile = 1609 meter
so this speed in m/s is given as
#7
No Luke is not accelerating when his speed is 150 mph
because at this speed his velocity will become constant
and since there is no change in velocity so his acceleration will become zero
#8
since at 150 mph the acceleration of Luke is zero
so net force on him must be zero
so we will have
wind force = weight or force due to earth
#9
If there is no wind resistance then there will be energy conservation
so KE = PE
#10
Net will reduce the velocity of luke to be zero by taking long time
As we know that force on a system is given by
so if we increase the time interval here then we will have less force
so Luke will unhurt due to more time to decrease his speed to be zero