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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Answer:
Both balls hit the ground at the same time
Explanation:
Adam drops the ball from rest, so the ball just "<em>falls</em>" in vertical direction, being gravity its only acceleration, for cinematic movements we use that:
In this case we have that gravity is negative, and as Adam drops the ball,
Bob throws the ball horizontally, so the movement will be a <em>parabola</em>, we can divide into horizontal direction, and vertical direction.
But we only need to analize the vertical movement, in wich again the only acceleration is gravity, and compare it with Adam's ball. Again we have that gravity is negative, and as the initial throw is horizontal,
Finally, we have that
where
both for Adam's vertical drop, and for Bob's vertical component of the parabolic throw.
Now, if we put (the origin of the vertical coordinate), we get for both cases that
where we can clear the value for the time t, of the fall, wich will be the same in both cases.
Hence, both balls hit the ground at the same time.