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Inessa [10]
3 years ago
6

(๑☯‿☯๑)‎What is space expanding?​

Physics
2 answers:
Marysya12 [62]3 years ago
3 0

Answer:

The idea behind space expansion is that after the big bang, the universe started infinitely expanding. It's also called metric expansion. Stephen Hawking's A Brief History of Time goes further into detail on this.

tankabanditka [31]3 years ago
3 0
I was going to help with this one but it looks like you got it all covered !!!!
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When a hydrometer (see Fig. 2) having a stem diameter of 0.30 in. is placed in water, the stem protrudes 3.15 in. above the wate
Masja [62]

Answer:

5.79 in

Explanation:

We are given that

Diameter,d=0.30 in

Radius,r=\frac{d}{2}=\frac{0.30}{2}=0.15 in

Weight of hydrometer,W=0.042 lb

Specific gravity(SG)=1.10

Height of stem from the water surface=3.15 in

Density of water=62.4lb/ft^3

In water

Volume  of water displaced V=\frac{mass}{density}=\frac{0.042}{62.4}=6.73\times 10^{-4} ft^3

Volume of another liquid displaced=V'=\frac{V}{SG}=\frac{6.73\times 10^{-4}}{1.19}=5.66\times 10^{-4}ft^3

Change in volume=V-V'

V-V'=\pi r^2 l

Substitute the values

6.73\times 10^{-4}-5.66\times 10^{-4}=3.14\times (\frac{0.15}{12})^2l

By using

1 ft=12 in

\pi=3.14

l=\frac{6.73\times 10^{-4}-5.66\times 10^{-4}}{3.14\times (\frac{0.15}{12})^2}

l=2.64 in

Total height=h+l=3.15+2.64= 5.79 in

Hence, the height of the stem protrude above the liquid surface=5.79 in

3 0
3 years ago
A golf ball is dropped from rest from a height of 8.40 m. It hits the pavement, then bounces back up, rising just 5.60 m before
allochka39001 [22]

Answer:

t1= 8.40/10 =.84 s

t2 = 5.60/10 = .56s

t3= 1.4/10 = .14s

total time = 1.54 sec

5 0
3 years ago
A body weighing 108N moves with seed of 5ms–¹ in a horizontal circular path of radius 5m. Calculate the magnitude of the centrip
uysha [10]

Hi there!

Recall the equation for centripetal force;

\boxed{F_c = \frac{mv^2}{r}}

m = mass (kg)

v = velocity (m/s)

r = radius (m)

We are not given the mass directly, we are given the object's weight.

W = mg

108 = 10m \\\\m = 10.8 kg

Now, we can plug this value along with the given velocity and radius to solve:

F_c = \frac{10.8(5^2)}{5} = \boxed{54N}

8 0
3 years ago
Identify the type of chemical reaction that is described.
Anastasy [175]

Water breaks down into  hydrogen and oxygen: It is a decomposition reaction as a single substance decomposes to give two products.

H_2O \rightarrow H_2 +\frac {1}{2}O_2

Leaves make starch using  chlorophyll and carbon dioxide: Synthesis reaction: as the synthesis reaction involves two or more than two reactants which join together to result into a single main product along with the formation of simple by products.

6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2

Food burns in oxygen gas  and releases a lot of energy: Combustion: Combustion process involves the use of oxygen to give products along with release of energy.

C_6H_{12}O_6 + 6O_2\rightarrow 6CO_2 + 6H_2O

Adding vinegar (acid) to baking soda (alkali) gives  a product that is neither  acidic nor alkaline: Neutralization: acetic acid in vinegar reacts with soda (base) to give salt (neutral) and .

CH_3COOH + NaHCO_3\rightarrow CH_3COONa +H_2O + CO_2





6 0
4 years ago
Creating a prototype and troubleshooting are steps in the development of?
balu736 [363]
Your answer is a new experiment, since it's something that hasn't been tried before, or has, but resulted in with lots of errors.
8 0
3 years ago
Read 2 more answers
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