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3 years ago

What is the atomic mass for Helium (He)? Question 5 options: 8 2 3 4

1 answer:

3 0

It is 2 because if you have a chart that shown all the elements at the top left corner it would show a number and that is the atomic number

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Can anyone answer these ? 40 points !!

lesantik [10]

1st one is D

2nd one is A

4 0

4 years ago

An inverted pyramid is being filled with water at a constant rate of 45 cubic centimeters per second. The pyramid, at the top, h

vaieri [72.5K]

Answer:

13.20 cm/s is the rate at which the water level is rising when the water level is 4 cm.

Explanation:

Length of the base = l

Width of the base = w

Height of the pyramid = h

Volume of the pyramid = $V=\frac{1}{3}lwh$

We have:

Rate at which water is filled in cube = $\frac{dV}{dt}= 45 cm^3/s$

Square based pyramid:

l = 6 cm, w = 6 cm, h = 13 cm

Volume of the square based pyramid = V

$V=\frac{1}{3}\times l^2\times h$

$\frac{l}{h}=\frac{6}{13}$

$l=\frac{6h}{13}$

$V=\frac{1}{3}\times (\frac{6h}{13})^2\times h$

$V=\frac{12}{169}h^3$

Differentiating V with respect to dt:

$\frac{dV}{dt}=\frac{d(\frac{12}{169}h^3)}{dt}$

$\frac{dV}{dt}=3\times \frac{12}{169}h^2\times \frac{dh}{dt}$

$45 cm^3/s=3\times \frac{12}{169}h^2\times \frac{dh}{dt}$

$\frac{dh}{dt}=\frac{45 cm^3/s\times 169}{3\times 12\times h^2}$

Putting, h = 4 cm

$\frac{dh}{dt}=\frac{45 cm^3/s\times 169}{3\times 12\times (4 cm)^2}$

$=13.20 cm/s$

13.20 cm/s is the rate at which the water level is rising when the water level is 4 cm.

3 0

3 years ago

✝️WARNING JESUS✝️IS COMING✝️COPY AND PASTE THIS✝️DO MORE CAN SEE THIS✝️SHARE THE GOSPEL✝️JESUS IS KING

Ierofanga [76]

Amen god is great, I’m glad there is nice Christians like you:)

7 0

3 years ago

This for number 8 and 9

3241004551 [841]

Okay for 8 it is the maximum levels will be higher and for 9 is poor circulation leads to lack of nutrients and oxygen

6 0

3 years ago

Is this right, I feel like its wrong

hjlf

It is correct, next time re-check your answer and don't second guess yourself. ;3

7 0

3 years ago