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: The velocity at different marked time points are given as
t1 = -
t2 = +
t3 = +
t4 = -
t5 = 0
Explanation:
The slope of the tangent of the curve indicates the instantaneous velocity. So if the slope of the tangent is positive, that Is, the tangent makes a positive angle (above the horizontal axis) with the horizontal
axis, then the velocity at this point is positive, and if the slope of the tangent is negative, that is the tangent makes a negative angle with the horizontal axis (below the horizontal axis), then the velocity at this point is negative.
When the tangent of the line is parallel to the horizontal axis, the velocity is 0.
From the position-time graph attached, the sign on the instantaneous velocity for each time marked on the graph is given below
t1 = -
t2 = +
t3 = +
t4 = -
t5 = 0
QED!
