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2 years ago

11

Most scientists believe that perpetual motion devices can never be invented, but people come up with new ideas for them all the

time. Do you think people should keep trying? Why?

1 answer:

PilotLPTM [1.2K]2 years ago

5 0

Answer:

hhshhsuyshvx guayuwysybe hxushusywhuxhs. sush

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What element in the fourth period is an exception to the Aufbau principle? a. Li c. Ca b. Cr d. Br

gulaghasi [49]

The fourth period contains 18 elements, beginning with potassium and ending with krypton. As a rule, period 4 elements fill their 4s shells first, then their 3d and 4p shells, in that order; however, there are exceptions, such as chromium.

Cr. I think

4 0

3 years ago

The cost, C C, of producing x x Totally Cool Coolers is modeled by the equation C = 0.005 x 2 − 0.25 x + 12 C=0.005x2-0.25x+12 H

neonofarm [45]

Answer:

25 coolers are need to be produce and sell in order to minimize the cost.

Explanation:

$C = 0.005x^2-0.25x+12$ ..[1]

Differentiating the given expression with respect to dx.

$\frac{dC}{dx}=\frac{d(0.005x^2-0.25x+12)}{dx}$

$\frac{dC}{dx}=0.01x-0.25+0$

Putting , $\frac{dC}{dx}=0$

$0=0.01x-0.25+0$

$0.01x=0.25$

x = 25

Taking second derivative of expression [1]

$\frac{d^2C}{dx^2}=\frac{d(0.01x-0.25)}{dx}=0.01$

$\frac{d^2C}{dx^2}>0$ (minima)

25 coolers are need to be produce and sell in order to minimize the cost.

3 0

2 years ago

Calculate the [OH–] if the hydrogen ion concentration is 3.64 x 10–8 M.

KIM [24]

Hello.

He have that:

[H+][OH-] = 10⁻¹⁴

3.64 x 10⁻⁸ [OH-] = 10⁻¹⁴

[OH-] = 0.27 x 10⁻⁶ mol/L

3 0

3 years ago

5 points ) Which of the following is a benefit of using email to communicate at work ? a) You can express yourself in a limited

Aloiza [94]

Answer:

C

Explanation:

7 0

2 years ago

Please help with 1 chemistry question thank you!

ale4655 [162]

Here are the CORRECT names and molecular formulas

carbonate: $CO_3^{2-}$
bicarbonate: $HCO_3^{-}$

Choice 1 is incorrect

nitrite: $NO_2^{-}$
nitrate: $NO_3^{-}$

Choice 2 is incorrect

sulfite: $SO_3^{2-}$
sulfide: $S^{2-}$

Choice 3 is incorrect

By process of elimination, you can infer choice 4 is correct.

Actually, choice 4 is the only choice that displays the correct name and formula.

Have an awesome day! :)

7 0

2 years ago