Answer:
Explanation:
The portion of solar energy converted into electric energy is given by the following equation:
The area needed to produce energy is derived by clearing the corresponding variable:
Explanation:
PEgrav = m *• g • h
In the above equation, m represents the mass of the object, h represents the height of the object and g represents the gravitational field strength (9.8 N/kg on Earth) - sometimes referred to as the acceleration of gravity.
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Potential Energy - The
Answer:
Explanation:
a ) Gravitational potential energy = - GMm/ r , G is universal gravitational constant , M and m are masses at distance r .
Putting the given values
Potential energy = -6.67 x 10⁻¹¹ x (1.67 x 10⁻²⁷)² / 2 x 10⁻¹⁵
=- 18.60 x 10⁻⁵⁰ J
=- 18.60 X 10⁻⁵⁰ / (1.6 x 10⁻¹⁹ x 10⁶) MeV
= - 11.62 x 10⁻³⁷ MeV
b ) electric potential energy = k q₁ x q₂ / r , k is constant which is equal to 9 x 10⁹ , q₁ and q₂ are charges and r is distance between charges
putting the values for two proton
= 9 x 10⁹ x ( 1.6 x 10⁻¹⁹ )² / 2 x 10⁻¹⁵ J
= 11.52 x 10⁻¹⁴ J
= 11.52 x 10⁻¹⁴ / (1.6 X 10⁻¹⁹ X 10⁶) MeV
= + .72 MeV
c ) energy of nuclear attraction = - 10 MeV.
It is more than energy of nuclear repulsion by more than 10 times.
B or c
It’s kinda confusing
Answer:
B. 3
Explanation:
The half-life of a radioisotope is the time it needs for the mass of the radioisotope to halve with respect to its original value.
In this problem, the initial mass of the radioisotope at t=0 is
m0 = 50.0 mg
We see that after t = 1 min, the mass of the isotope is
m(1 min) = 25.0 mg
so, exactly half the initial mass: this means that 1 minute is exactly the half-life of this radioisotope.
So, the amount of mass left after each minute is the following:
m (1 min ) = 25.0 mg (1 half-life)
m (2 min) = 12.5 mg (2 half-lives)
m (3 min) = 6.25 mg (3 half-lives)
so, when we are left with 6.25 mg of isotope, 3 minutes have passed, which means that 3 half-lives have passed.