Answer:
λ = 2042 nm
Explanation:
given data
screen distance d = 11 m
spot s = 4.5 cm = 4.5 ×
m
separation L = 0.5 mm = 0.5 ×
m
to find out
what is λ
solution
we will find first angle between first max and central bright
that is tan θ = s/d
tan θ = 4.5 × / 11
θ = 0.234
and we know diffraction grating for max
L sinθ = mλ
here we know m = 1 so put all value and find λ
L sinθ = mλ
0.5 × sin(0.234) = 1 λ
λ = 2042.02 ×
m
λ = 2042 nm
Acceleration is the rate of change of velocity per unit of time.
There is a 40m drop from the bridge, so we can work out the time of the vertical component first (how long it will take to reach the water)
do this by using a SUVAT equation s=ut+0.5at^2
this rearranges to t= sqrt(2s/a)
- note that u has been removed since there is no initial velocity.
sqrt((2*40)/9.81)= 2.86 seconds
this means that the horizontal component of 50m has so be covered in 2.86s
and speed = distance/ time
50m/2.86s=17.48ms^-1
the line has to be thrown at 17.48ms^-1 or more to reach the life boat.
Answer:
a c d
Explanation:
because I said so and yeah nshsjsisayagavava sishywabhwvsusnsbs
