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marshall27 [118]
3 years ago
7

What is meant by the negative sign in an answer like"-46.8kJ"? When would you use a positive sign

Chemistry
1 answer:
MA_775_DIABLO [31]3 years ago
3 0
It’s positive when you use energy for work
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If a horse is moving and then come to a stop is the horse accelerating or decelerating
quester [9]

Answer:

decelerating hope this helps❤️

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4 years ago
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What is the density of a liquid with 206 g and 321 ml?
Vilka [71]
The answer is 0.642 g/mL
4 0
4 years ago
An object starts at position 12 on a horizontal line with a reference point of o. What is the position of the object if it moves
eimsori [14]

Answer:

-2

Explanation:

Consider object is starting 12 units right from the reference point which is 0.

Assign the right direction positive sign.

when object is moving 14 units on left direction the position of object will be two units to the left side of reference point.

Assign the left direction negative sign position will be -2.

6 0
3 years ago
If the inital pressure of an ideal gas at a temperature of 344 K is 0.917 atm, what is the pressure of the gas at 322 K?
Gennadij [26K]

Answer:  P2 = 0.858 atm

Explanation:

Use the combined gas law:  P1V1/T1 = P2V2/T2,

where the subscripts are the initial (1) and final (2) states.  Temperature must be in Kelvin.  We want P2, so rearrange the equation to solve for P2:

P2 = P1(V1/V2)(T2/T1)

Note how I've arranged the volume and temperature values:  as ratios.  Now it is easy to cancel units and see what is going to happen to the pressure if we lower the temperature.  Since the pressure change is a function of (T2/T1), and we are lowering the temperature (T2), we'd expect this to decrease the pressure.

No information is given on volume, so we'll assume a convenient value of 1 liter.  Now enter the data:

P2 = (0.917atm)*(1)*(322K/344K)

P2 = 0.858 atm

8 0
3 years ago
A sheet of aluminum foil has a total area of 1.000 m2 and a mass of 3.636 g. What is the thickness of the sheet in millimeters?
olga2289 [7]

Answer:

t=1.34\times 10^{-3}\ mm

Explanation:

Given that,

Area of sheet of Aluminium foil is 1 m²

Mass of the sheet = 3.636 g

The density of Aluminium, d=2.699\ g/cm^3

We need to find the thickness of the sheet in millimeters.

The density of an object is given in terms of its mass and volume as follows :

d=\dfrac{m}{V}

V = volume, V = A×t, t = thickness of the sheet

So,

d=\dfrac{m}{A\times t}\\\\t=\dfrac{m}{Ad}\\\\t=\dfrac{3.636\ g}{10000\ cm^2\times 2.699\ g/cm^3}\\\\t=0.000134\ cm

Since, 1 cm = 10 mm

So,

t = 0.00134 mm

or

t=1.34\times 10^{-3}\ mm

8 0
3 years ago
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