A television that is 83% efficient provides 4 600) of useful energy. How much energy
1 answer:
Answer:
Total energy consume will be equal to 5542.175 j
Explanation:
We have given efficiency of the television is 83% = 0.83
Now it is given that useful energy is 4600 joule
We have to find the total energy consume
We know that efficiency is equal to ratio of useful energy to total energy consume
So
total energy consume = 5542.175
So total energy consume will be equal to 5542.175 J
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where
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m1 and m2 are the masses of the two objects
r is the separation between the two objects
The distance of the telescope from the Earth's center is
, the gravitational force is 
and the mass of the Earth is 
, therefore we can rearrange the previous equation to find m2, the mass of the telescope:
where
G is the gravitational constant
m1 and m2 are the masses of the two objects
r is the separation between the two objects
The distance of the telescope from the Earth's center is
Answer:
proof in explanation
Explanation:
First, we will calculate the number of half-lives:
where,
n = no. of half-lives = ?
t = total time passed = 2100 million years
= half-life = 700 million years
Therefore,
Now, we will calculate the number of uranium nuclei left ():
and the rest of the uranium nuclei will become thorium nuclei ()
dividing both:
<u>Hence, it is proven that after 2100 million years there are seven times more thorium nuclei than uranium nuclei in the rock.</u>