why do astronauts build radio telescopes and x-ray telescopes, in addition to the optical telescopes with which most people are
1 answer:
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Answer:
6.0 m/s
Explanation:
According to the law of conservation of energy, the total mechanical energy (potential, PE, + kinetic, KE) of the athlete must be conserved.
Therefore, we can write:
or
where:
m is the mass of the athlete
u is the initial speed of the athlete (at the bottom)
0 is the initial potential energy of the athlete (at the bottom)
v = 0.80 m/s is the final speed of the athlete (at the top)
is the acceleration due to gravity
h = 1.80 m is the final height of the athlete (at the top)
Solving the equation for u, we find the initial speed at which the athlete must jump:
Answer:
The total energy is
Explanation:
From the question we are told that
The Poynting vector (energy flux ) is
The length of the rectangle is
The width of the rectangle is
The time taken is
The total electromagnetic energy falls on the area is mathematically represented as
Where A is the area of the rectangle which is mathematically represented as
substituting values
substituting values