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3 years ago

Convert 0.00389 seconds into Scientific Notation

Physics

1 answer:

prohojiy [21]3 years ago

7 0

Answer:

3.89*10^3

Explanation:

The Scientific notation of the question 0.00389 is 3.89*10^3 ( which is 3 point Eighty Nine Multiply ( Multiply sign " * " ) Ten with raising power (this sign is used normally to write power ^ ) Three).

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Moral science is social sciences or philosophy.

That's it, really!

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Help me please........................

marishachu [46]

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3 years ago

Suppose you have an object tied to a rope and are rotating it over your head in uniform circular motion. What would have to do t

Crazy boy [7]

Answer:

We must duplicate the length of the rope (R'=2R) to get

$F'=\frac{1}{2}F$

Explanation:

The equation of the centripetal force is given by:

$F_{c}=ma_{c}$

$F_{c}=m\frac{v^{2}}{R}$

Where:

R is the length of the rope

m is the mass of the object

v is the speed of the object

If we want to reduce the centripetal force in half, we can duplicate the length of the rope (R'=2R), which means:

$F'_{c}=m\frac{v^{2}}{R'}$

$F'_{c}=m\frac{v^{2}}{2R}$

$F'_{c}=\frac{1}{2}F_{c}$

I hope it helps you!

6 0

3 years ago

Water has a mass per mole of 18.0 g/mol, and each water molecule (H20) has 10 electrons. (a) How many electrons are there in one

Allushta [10]

Answer:

total number of electron in 1 litter is 3.34 × $10^{26}$ electron

Explanation:

given data

mass per mole = 18 g/mol

no of electron = 10

to find out

how many electron in 1 liter of water

solution

we know molecules per gram mole is 6.02 × $10^{23}$ molecules

no of moles is 1

total number of electron in water is = no of electron ×molecules per gram mole × no of moles

total number of electron in water is = 10 × 6.02 × $10^{23}$ × 1

total number of electron in water is = 6.02× $10^{24}$ electron

and

we know

mass = density × volume ..........1

here we know density of water is 1000 kg/m

and volume = 1 litter = 1 × $10^{-3}$ m³

mass of 1 litter = 1000 × 1 × $10^{-3}$

mass = 1000 g

total number of electron in 1 litter = mass of 1 litter × $\frac{molecules per gram mole}{mass per mole}$

total number of electron in 1 litter = 1000 × $\frac{6.02*10{24}}{18}$

total number of electron in 1 litter is 3.34 × $10^{26}$ electron

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3 years ago

A landscaper is making a retaining wall to shore up the side of a hill. to ensure against collapse, the wall should make an angl

Musya8 [376]

Refer to the diagram shown below.

Let x = distance of the base of the ladder from the base of the hill.

By definition,
sin(75°) = x/15
x = 75*cos(75°) = 3.882 ft

Answer:
The distance between the base of the hill and the base of the ladder is 3.9 ft (nearest tenth)

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4 years ago