Power The formula for the power output P of a battery is P = V I − R I 2 where V is the electromotive force in volts. R is the resistance in ohms, and I is the current in amperes. Find the current that corresponds to a maximum value of P in a battery for which V = 12 volts and R = 0.5 ohm. Assume that a 15-ampere fuse bounds the output in the interval 0 ≤ I ≤ 15 . Could the power output be increased by replacing the 15-ampere fuse with a 20-ampere fuse? Explain.
Power The formula for the power output P of a battery is P = V I − R I 2 where V is the electromotive force in volts. R is the resistance in ohms, and I is the current in amperes. Find the current that corresponds to a maximum value of P in a battery for which V = 12 volts and R = 0.5 ohm. Assume that a 15-ampere fuse bounds the output in the interval 0 ≤ I ≤ 15 . Could the power output be increased by replacing the 15-ampere fuse with a 20-ampere fuse? Explain.
Solution Summary: The author explains how a 20-ampere fuse would not increase the power output and the maximum value of P is 72 watt.
Power The formula for the power output P of a battery is
P
=
V
I
−
R
I
2
where V is the electromotive force in volts. R is the resistance in ohms, and I is the current in amperes. Find the current that corresponds to a maximum value of P in a battery for which
V
=
12
volts and
R
=
0.5
ohm. Assume that a 15-ampere fuse bounds the output in the interval
0
≤
I
≤
15
. Could the power output be increased by replacing the 15-ampere fuse with a 20-ampere fuse? Explain.
Consider the function f(x) = x²-1.
(a) Find the instantaneous rate of change of f(x) at x=1 using the definition of the derivative.
Show all your steps clearly.
(b) Sketch the graph of f(x) around x = 1. Draw the secant line passing through the points on the
graph where x 1 and x->
1+h (for a small positive value of h, illustrate conceptually). Then,
draw the tangent line to the graph at x=1. Explain how the slope of the tangent line relates to the
value you found in part (a).
(c) In a few sentences, explain what the instantaneous rate of change of f(x) at x = 1 represents in
the context of the graph of f(x). How does the rate of change of this function vary at different
points?
1. The graph of ƒ is given. Use the graph to evaluate each of the following values. If a value does not exist,
state that fact.
и
(a) f'(-5)
(b) f'(-3)
(c) f'(0)
(d) f'(5)
2. Find an equation of the tangent line to the graph of y = g(x) at x = 5 if g(5) = −3 and g'(5)
=
4.
-
3. If an equation of the tangent line to the graph of y = f(x) at the point where x 2 is y = 4x — 5, find ƒ(2)
and f'(2).
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