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2 years ago

Help me with questions 5 6 and 7! I will mark brainliest.

Mathematics

1 answer:

Leviafan [203]2 years ago

7 0

Answer:

5) a=79º b=101º

Step-by-step explanation:

I am not entirely sure but I hope it helps! I'm sorry I only know number 5.

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One thousand tonnes (1000 t, one t equals 10 cubed kg) of sand contains about a trillion (10 super 12) grains of sand. How many

Phantasy [73]

Answer with Step-by-step explanation:

Since 1 mole of sand will contain Avagadro's Number of sand particles (by definition of 1 mole)

Thus we have

1 mole of sand = $6.022\times 10^{23}$ sand particles

Thus in number of trillion sand particles we have no of trillion sand particles in 12 mole is

$\frac{6.022\times 10^{23}}{10^{12}}=6.022\times 10^{11}$

Now since it is given that mass of 1 trillion sand particles is 1000 tonnes Thus the mass of $6.022\times 10^{11}$ trillion sand particles is

$Mass=1000\times 6.022\times 10^{11}=6.022\times 10^{14}tonnes$

Part 2)

Since it is given that volume of 1 sand particle is $1.0mm^{3}$ thus the volume of 1 mole of sand is volume of $6.022\times 10^{23}$ sand particles

Thus volume of 1 mole is $V=1.00\times 10^{-18}km^{3}\times 6.022\times 10^{23}=6.022\times 10^{5}km^{3}$

Now since the Area of united states is $A=3.6\times 10^{6}mile^{2}=5.8\times 10^{6}km^{2}$

Thus the depth of the sand pile is

$Depth=\frac{Volume}{Area}=\frac{6.022\times 10^5}{5.8\times 10^6}=0.10387km=103.8meters$

4 0

2 years ago

Jill bought a lamp for $40. She sold it at a garage sale for $12. What was the approximate decrease?

Vesnalui [34]

Answer:

she was left with 28$ I'm in high school i think I'm right

Step-by-step explanation:

3 0

2 years ago

HELP PLZ FIRST TO ANSWE GETS BRAINLIEST

tigry1 [53]

Hey there!

I think the answer is B.

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2 years ago

A grocery bag can withstand 300 n of force before it rips apart. how many kilograms of apples can it safely hold?

Inessa [10]

F = 300N
g = 9.81 m/s2
m = ?

F = g*m
m = F/g
m = 30.58 kg

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2 years ago

In a supermarket, bottles of lemonade are on a buy one get one half price offer.

Lady_Fox [76]

Answer: 114p

Step-by-step explanation:

Hope it helps

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2 years ago