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2 years ago

Which represent correct variations of the formula for speed? Check all that apply. t = s = t = s = dt d = st d =

Chemistry

2 answers:

Alex Ar [27]2 years ago

6 0

Speed = distance/time

Distance = speed*time

Time = distance/speed

krok68 [10]2 years ago

5 0

Explanation :

Speed of an object is defined as the total distance covered divided by total time taken by it.

Mathematically, it can be written as :

$speed=\dfrac{total\ distance}{total\ time}$

Let d is the total distance covered and t is the time taken. Then the speed s is given by :

$s=\dfrac{d}{t}$

Distance is taken in meters (m).

Time is taken in seconds (s).

So, the speed of an object is taken in m/s.

Hence, this is the required solution.

You might be interested in

Gasoline has a density of 0.749 g/mL. There are 454 grams in a pound and 3.7854 litres in a gallon. How many pounds does 19.2 ga

alexgriva [62]

Answer:

119.9 pound

Explanation:

Given data:

Density of gasoline = 0.749 g/mL

Volume of gasoline = 19.2 gal (19.2× 37854 =72679.9 mL)

Mass = ?

Solution:

Density:

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

D= density

m=mass

V=volume

Now we will put the values in formula:

d = m/v

0.749 g/mL = m/ 72679.9 mL

m = 54437.25 g

gram to gallon:

54437.25/ 454

m = 119.9 pound

7 0

2 years ago

An object accelerates 3.0 m/s2 when a force of 6.0 Newton’s is applied to it. What is the mass of the object?

Alekssandra [29.7K]

Answer:2kg

Explanation:

Mass =?

Acceleration = 3.0 m/s2

Force = 6.0N

Force = Mass x Acceleration

6 = Mass x 3

Mass =6/3 = 2Kg

6 0

2 years ago

Which of the samples described below contains the FEWEST atoms? No calculation is needed to answer this question.

Monica [59]

Hello!

To do this, use the molar mass. This is how much a mole of an atom weighs. A mole is 6.02214076×10²³ atoms.

Molar masses of:

Se: 78.96 g/mol

Cu: 63.546 g/mol

Ba: 137.327 g/mol

Now, the element with the highest molar mass will have the fewest atoms. This is because the element weighs more, so therefore for the same amount of mass, there will be less of the element needed to reach that mass.

Therefore, 10g of Ba would have the fewest number of atoms.

Hope this helps!

6 0

2 years ago

The combustion of propane gas is used to fuel barbeque grills. If 4.65 moles of propane, C3H8, are burned in a grilling session,

Varvara68 [4.7K]

Answer:

<h3>moles of carbon dioxide=13.95mol</h3>

Explanation:

First wrie down the balance chemical reaction:

$C_3H_8(g) + 5 O_2(g) \rightarrow 3 CO_2(g) + 4 H_2O(l)$

Combustion reaction: The reacion in which hydrocarbon is burnt in the presence of oxygen gas and it releases heat and this reaction exothermic because heat of cumbustion is negative.

eg. burning of methane

By using unitry method,

From the above balanced reaction it is clearly that,

from 1 mole of propane 3 moles of carbon dioxide is formed

there fore,

from 4.65 mole of propane $3 \times 4.65$ moles of carbon dioxide will form

moles of carbon dioxide=13.95mol

8 0

2 years ago

7. How many moles of argon are there in 20.0 L, at 25 degrees Celsius and 96.8 kPa?

suter [353]

<h3>Answer:</h3>

0.8133 mol

<h3>Solution:</h3>

Data Given:

Moles = n = ??

Temperature = T = 25 °C + 273.15 = 298.15 K

Pressure = P = 96.8 kPa = 0.955 atm

Volume = V = 20.0 L

Formula Used:

Let's assume that the Argon gas is acting as an Ideal gas, then according to Ideal Gas Equation,

P V = n R T

where; R = Universal Gas Constant = 0.082057 atm.L.mol⁻¹.K⁻¹

Solving Equation for n,

n = P V / R T

Putting Values,

n = (0.955 atm × 20.0 L) ÷ (0.082057 atm.L.mol⁻¹.K⁻¹ × 298.15 K)

n = 0.8133 mol

4 0

2 years ago

Read 2 more answers