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3 years ago

What is the difference between a pulley and incline plane?

2 answers:

4 0

Pulley is a man made tool that helped people along tome to lift things they could not do by hand while a incline plane is like a car but flat and a machine that would let a person driving it to take thing froom one place to another.The difference is that a pulley lifts things whle a inclined plane moves supplies to another place.

erik [133]3 years ago

3 0

A incline plane is a flat inclined surface. You can stick a rope in the pulley and pull one side and the other side will lift something! They are both simple machines! The difference is a incline plane is a ramp and things go up or down and the pulley lifts something with force of your weight!!

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What is the volume of a sample of mercury having a mass of 1.0 kg if the density of mercury is 13.5g/cm3?

bonufazy [111]

Answer:

<h2>volume = 74.07 cm³</h2>

Explanation:

The volume of a substance given the density and mass can be found by using the formula

$volume = \frac{mass}{Density}$

From the question

Density = 13.5 g/cm³

We must first convert the mass from kg to g

1kg = 1000 g

mass of mercury = 1000 g

Substitute the values into the above formula and solve

That's

$volume = \frac{1000}{13.5}$

We have the final answer as

<h3>volume = 74.07 cm³</h3>

Hope this helps you

3 0

4 years ago

You want to make 100 mL of a 2.5 M stock solution of calcium chloride (molecular weight 110.98 g/mol). How many grams of calcium

Evgesh-ka [11]

Answer:

27.7 g

Explanation:

100 mL = 0.100 L

To solve this problem we use the definition of <em>molarity</em>:

M = mol / L

From the problem we're given M = 2.5 M and volume = 0.100 L. We use the above formula and <u>calculate the required moles of calcium chloride</u> (CaCl₂):

2.5 M = moles / 0.100 L

moles = 0.25 moles CaCl₂

Finally we use the<em> molecular weight</em> of calcium chloride to <u>calculate the required mass</u>:

0.25 moles CaCl₂ * 110.98 g/mol = 27.745 g CaCl₂

Rounding to the nearest tenth of a gram the answer is 27.7 g.

5 0

3 years ago

Nitrogen and hydrogen can react to form ammonia. n2(g)+3h2(g)→2nh3(g) part a choose ratios showing the relationships between mol

Lelechka [254]

The ratio that show the relationship between moles of each reactant and product in the reaction that is

N2 + 3 H2 = 2NH3

the ratio is as follows

1mole N2 : 3 mol H2 :2mol NH3

This ratio is from equation since there is 1 mole of N2 reacted with 3 moles of H2 to produce 2 moles of NH3

6 0

3 years ago

Hydrogen sulfide decomposes according to the following reaction, for which Kc = 9.30 10-8 at 700°C. 2 H2S(g) 2 H2(g) + S2(g) If

Vikentia [17]

Answer:

The equilibrium concentration of hydrogen gas is 0.0010 M.

Explanation:

The equilibrium constant of the reaction = $K_c=9.30\times 10^{-8$ }

Moles of hydrogen sulfide = 0.31 mol

Volume of the container = 4.1 L

$[concentration]=\frac{moles}{volume (L)}$

$[H_2S]=\frac{0.31 mol}{4.1 L}=0.076 M$

$2H_2S(g)\rightleftharpoons 2H_2(g)+S_2(g)$

Initially

0.076 M

At equilibrium

(0.076-2x) 2x x

The expression of an equilibrium constant :

$K_c=\frac{[H_2]^2[S_2]}{[H_2S]^2}$

$9.30\times 10^{-8}=\frac{(2x)^2\times x}{(0.076-x)^2}$

Solving for x:

x = 0.00051

The equilibrium concentration of hydrogen gas:

$[H_2]=2x=2\times 0.00051 M=0.0010 M$

4 0

4 years ago

Lesson 26

joja [24]

Answer:

The difference in ionic and covalent bonding is ionic bonds take the atoms from the other atom and covalent bonding shares the atoms it needs with another atom

8 0

4 years ago