The expression of power? (the relationship between P, F, a, t, V)

The expression of power? (the relationship between P, F, a, t, V)

P = w / T = f * s / T = f * V, the relationship between velocity and acceleration: a = Delta V / delta T

I'd like to ask the expression of the electric energy produced by the reaction of hydrogen and oxygen
It's fuel cell chemistry
If possible, please indicate what materials are used for cathode and anode in charge collection
What kind of material is used for electrode? Is it the same material for positive electrode and negative electrode
Can you be more specific

For PEMFC
Anode (negative) H2 -- 2H + + 2e-
Cathode (positive) 1 / 2 O2 + 2H + + 2E - -- H2O
The cathode and anode materials can be graphite or stainless steel, as long as they can conduct electricity and have low contact resistance with mea

Using dichotomy to find the zero point of function f (x) = X3 + 5, the initial interval is ()
A. [-2，1]B. [-1，0]C. [0，1]D. [1，2]

The initial interval [a, b] taken by dichotomy for finding the zero point of change sign should be such that f (a) · f (b) < 0. Since the function f (x) = X3 + 5, f (- 2) = - 3, f (1) = 6 in this problem obviously satisfies f (- 2) · f (1) < 0, the initial interval that can be taken for the zero point of function f (x) = X3 + 5 is [- 2, 1], so a

The intersection points of parabola y = - x2 + BX + C and X axis are a (m, 0), B (n, 0) and M + n = 4 m / N = 1 / 3
Question: the intersection of this parabola and y-axis is C. through C, make a straight line parallel to X-axis to intersect the parabola at another point P, and calculate the area of triangle ACP

The solution is as follows: according to the condition m + n = 4 m / N = 1 / 3, it is easy to get m = 1; n = 3; so the root of the original equation is X1 = 1, X2 = 3; then the equation can be set as y = K (x-1) (x-3); that is, y = KX ^ 2-4kx + 3K can get k = - 1 by comparing with y = - x ^ 2 + BX + C; then the equation can be found as y = - x ^ 2 + 4x-3; according to the graph, so the trigonometric

The vertex of the parabola y = x2-4x + 2 is at the second point______ Quadrant

The vertex coordinates of parabola y = x2-4x + 2 are: x = - 42 = 2, y = 4 × 1 × 2 − (− 4) 24 = - 2, that is, (2, - 2), ∵ 2 > 0, - 2 < 0, and the vertex is in the fourth quadrant

Is 111 prime or composite? 108?

111 and 108 are composite numbers. Prime numbers can only be divisible by 1 and itself. Composite numbers can be divisible by other integers besides 1 and itself,

Reductive x ^ 2 - (Y-Z) ^ 2 / (x + y) ^ 2-z ^ 2

It's hard

How to convert the units of the formula of linear speed = rotational speed x circumference?
Linear velocity M / s, perimeter m, rotational speed r / S
M / S = R / min times m, isn't that right?

You give the formula: linear speed = rotational speed × perimeter. The unit of linear speed is --- M / s, and the unit of perimeter is of course --- M. the key is rotational speed. Its unit should be --- R / s, and the unit of rotational speed you give is: R / min. here are two points to explain: first, the time unit "minute" should be changed into "second", for example

Given X & sup2; - 3Y = 2XY (x > 0, Y > 0), find the value of X + 2Y / X-Y

x²-2xy-3y²=0
(x-3y)(x+y)=0
x> If Y > 0, then x + Y > 0
So x-3y = 0
x=3y
So the original formula = (3Y + 2Y) / (3y-y)
=5y/2y
=5/2

First degree equation of one variable! I'm a student of grade one in junior high school. I want to solve the first degree equation of one variable!
A certain brand of suit is ready to be sold at a discount due to season change. If it is sold at a 7.50% discount, it will lose 25 yuan per suit; if it is sold at a 10% discount, it will earn 20 yuan per suit. How much is the price of the suit

Set the price as X Yuan
X*0.75+25=X*0.9-20
0.75X-0.9X=-20-25
0.15X=45
X=300
The price of the suit is 300 yuan