2 points
13. The law of conservation of mass can be demonstrated by a chemical
reaction. Which of the following models of a chemical reaction best
represents the law of conservation of mass?
A
C
B
D.
8
8.
a.
Ο Ο Ο Ο

Answer:

According to Newton's third law of motion, for every action, there is an equal and opposite reaction. When the man jumps from a boat, he applies force on the boat due to which boat moves backward. An equal force is exerted by the boat on the man which helps the man to jump out of the boat.

Answer:

The Moon's monthly

cycle of phases

results from the

changing angle of

its illumination by the Sun.

Because its period of

revolution is the same as its

period of rotation, the Moon

always keeps the same face

toward Earth.

Answer:

The circuit with the larger diameter pipes will have higher water flow.

Explanation:

The flow rate can be calculated with this formula, [tex]Q = v.A[/tex] , where [tex]v[/tex] is the velocity of the water flow and [tex]A[/tex] is the cross-sectional area of the pipe. Considering the two circuits are identical except only for the diameter of the pipes, the flow of water will be greater through the circuit with the larger diameter pipes. It will be proportional with respect to the square of the pipe's diameter.

I hope this answer helps.

Answer:

Following are the responses to the given question:

Explanation:

In point a:

Nucleus denoting, he refers to those same nuclei of the helium ( that is alpha particle)

[tex]{z}^{N^{A}}\to z-2^{N^{A-4}} + 2^{He^{4}}[/tex]

In point b:

Let the kinetic energy of [tex]\alpha[/tex] particle = [tex]K_1[/tex]

[tex]\to K_1 = \frac{mass \times (velocity)^2}{2}[/tex]

The velocity of [tex]\alpha[/tex] particle [tex](v_1)= (2 \times \frac{k_1}{m_1})^\frac{1}{2}[/tex]

Let daughter core velocity be =[tex]v_2[/tex]

Preserving linear acceleration since there was no external factor we can write

[tex]\to m_2 \times v_2 = m_1 \times v_1\\\\\to v_2 = \frac{m_1\times v_1}{m_2}\\\\\to v_2 = \frac{m_1\times (2 \times \frac{k_1}{m_1})^{\frac{1}{2}}}{m_2}[/tex]

Daughter nuclei energy can be written as:

[tex]\to \frac{mass \times (velocity)^2}{2}\\\\\to \frac{m_2 \times (m_1)^2 \times 2 \times k_1}{(2\times m_1 \times (m_2)^2)}\\\\ \to (\frac{m_1}{m_2}) \times k_1[/tex]

In point c:

Initial weight = M

Total product weight [tex]= m_1 + m_2[/tex]

You can use the total release energy (Q-factor) as =[tex](M - (m_1+m_2)) c^2[/tex]

Answer:

The catcher does negative work on the ball because the force exerted by the catcher is opposite in direction to the motion of the ball.

Explanation:

Answer:

uneven

Explanation: :)

Answer:

uneven charge, b

Explanation:

Answer:

1.11 m.

Explanation:

Why?

The speed for a wave is done by the equation:   v = f * w. Because the frecuency tells us about how many cycles the wave makes each time, but for each cycle the wave runs certain distance, given for the wavelenght. If you isolate the letter w you get the value just doing a ratio.

v = speed

f = frecuency

w = wavelenght

w = v / f

Answer:

3

Explanation:

From the question given above, the following data were obtained:

Length (L) = 3 m

Height (H) = 1 m

Mechanical advantage (MA) =.?

The ideal mechanical advantage for the system can be obtained as follow:

MA = L/H

MA = 3/1

MA = 3

Therefore, the ideal mechanical advantage for the system is 3

Answer:

Explanation:

Mechanical Advantage is the ratio of Input Distance / Output Distance.

In this case, the output distance is to bring up the cart by 1m.

The input distance is to push the cart by 3m.

Assume an ideal machine, MA = 3/1 = 3

Answer:

Explanation:

In an elliptical orbit , the angular momentum of the planet remains constant because velocity of planet makes a right angle to the direction to the star .

mvr = constant .

mv₁r₁ = mv₂r₂

v₁r₁ = v₂r₂

v₁ x 21 = 38 x 75

v₁ = 135.71 km/s .

Answer:

precipitation is the answer..

Explanation:

precipitation is any product of the condensation of atmospheric water vapor that falls under gravitational pull from clouds. The main forms of precipitation include drizzling, rain, sleet, snow, ice pellets, graupel and hail.

Answer:

6-a .   7-c

Explanation:

Answer:

C

Explanation:

Because this same question was on my test last week and I got it correct

Answer:

m=1800kg

1800000g×10N/kg

18000000N force is required to life the car

Answer:

t = 9.38 s

Explanation:

Given that,

The speed of the sound wave, v = 343 m/s

Distance, d = 1610 m

We need to find the time taken to travel a mile. The distance traveled by the sound is 2d. Using the formula for speed,

[tex]v=\dfrac{2d}{t}[/tex]

t is the time taken to travel a mile

So,

[tex]t=\dfrac{2d}{v}\\\\t=\dfrac{2\times 1610}{343}\\\\t=9.38\ s[/tex]

So, it will take 9.38 seconds.

Answer:

4.69s

Explanation:

The formula to find time is time = distance / velocity

Plug the numbers into the formula

So

1610 / 343

= 4.69s

Answer:

T.K.E = 750 Joules.

Explanation:

Given the following data;

Initial velocity, u = 5m/s

Final velocity, v = 10m/s

Mass of bicyclist = 50kg

Mass of bicycle = 10kg

Total mass, Tm = 50 + 10 = 60kg

Kinetic energy can be defined as an energy possessed by an object or body due to its motion.

Mathematically, kinetic energy is given by the formula;

[tex] K.E = \frac{1}{2}mv^{2}[/tex]

Where;

K.E represents kinetic energy measured in Joules.

m represents mass measured in kilograms.

v represents velocity measured in metres per seconds square.

To find the total kinetic energy before accelerating simply means the kinetic energy due to the initial velocity and total mass;

[tex] T.K.E = \frac{1}{2}T_{m}U^{2}[/tex]

Substituting into the equation, we have;

[tex] T.K.E = \frac{1}{2}*60*5^{2}[/tex]

[tex] T.K.E = 30*25 [/tex]

T.K.E = 750 Joules.

Answer:

Advantages of mercury as a thermometric liquid.

-It is a good conductor of heat and therefore the whole liquid reaches the temperature of the surroundings quickly.

-It does not wet (cling to the sides of) the tube.

-It has a high boiling point

-It expands uniformly (linear expansion) and responds quickly to temperature changes, hence is sensitive.

-It has a visible meniscus.

Disadvantages

-Mercury is very poisonous.

-its expansively is fairly low

-it is expensive

-It has a high freezing point therefore it cannot be used in places where the temperature gets very low.

Alcohol has a thermometric fluid

-Alcohol expands uniformly.

-It has a low freezing point (-115 degreecentigrade) therefore it is very suitable for place where the temperature gets very low.

-It has a large expansively

-It is an easily available cheap liquid, which is safe to use

Disadvantages of alcohol

-it wets the tube

-it has a low boiling point (cannot be used in places with high temperatures)

-it does not react quickly to changes in temperature

-It needs to be dyed, since it's colourless.

Disadvantages of water

-Water has high specific heat capacity. So it cannot be used for measuring small temperature differences.

- Water will wet the surface of the glass tube. It is a sticky substance.

- Water is transparent

Explanation:

Answer:

The work done to get you safely away from the test is  2.47 X 10⁴ J.

Explanation:

Given;

length of the rope, L = 70 ft

mass per unit length of the rope, μ = 2 lb/ft

your mass, W = 120 lbs

mass of the 70 ft rope  = 2 lb/ft x 70 ft

                                         = 140 lbs.

Total mass to be pulled to the helicopter, M = 120 lbs  + 140 lbs  

                                                                       = 260 lbs

The work done is calculated from work-energy theorem as follows;

W = Mgh

where;

g is acceleration due gravity = 32.17 ft/s²

h is height the total mass is raised = length of the rope = 70 ft

W = 260 Lb x 32.17 ft/s²  x 70 ft

W = 585494 lb.ft²/s²

1 lb.ft²/s² = 0.0421 J

W = 585494 lb.ft²/s²  = 2.47 X 10⁴ J.

Therefore, the work done to get you safely away from the test is  2.47 X 10⁴ J.

Answer:

False

Explanation:

I believe it's false.

Evidence not supporting the humanistic perspective is easily measured. So, the given statement is False.

Evidence is defined as an object or information introduced to make the existence of a fact more or less probable that of testimony, document, photograph, video, voice recording, DNA test, or other tangible objects. can take form.

Evidence is used to prove an argument made by individuals or groups that believe something is true or a fact that can be used to refute or disprove a fact or argument that people disagree with, or considered false.

Thus, Evidence not supporting the humanistic perspective is easily measured. So, the given statement is False.

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Answer:

285 Litre ( 1kg of water occupies 1 Litre )

which is identical to 285 dm^3 ie 285 cubes of length 10 cm

and as there are 10 of these linearly in 1 m then there are 10^3 = 1000 dm^3 in each m^3

giving a volume of 0.285 m^3

Of course if you KNEW that 1m^3 of water has a mass of 1000 kg then you would simply have said that the volume was 285/1000 m^3

The volume of the water will be  0.285 [tex]m^{3}[/tex]

A volume is simply defined as the amount of space occupied by any three-dimensional solid. These solids can be a cube, a cuboid, a cone, a cylinder or a sphere. Different shapes have different volumes. Volume is the measure of the capacity that an object holds.

A method in which the value of the unit (one) quantity is first obtained to find the value of any required quantity is called the unitary method. So , by finding the value volume of 1 kg water , we can find the volume of 285 kg water by simply multiplying it with the volume of 1kg water using unitary method

using unitary method

1000 kg of mass have volume of = 1[tex]m^{3}[/tex]

then , the volume of 1kg  will be = 1 / 1000  [tex]m^{3}[/tex]  

The volume of 285 kg will be =  (1 / 1000) * 285 = 0.285 [tex]m^{3}[/tex]

Hence if a barrel contains 285 kg of water, then the volume of the water will be  0.285 [tex]m^{3}[/tex]

To learn more about volume here

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Answer:

B

Explanation:

i think

Answer:

D. makes rules for other banks

Explanation:

Answer:

hahsbahbavbsbsbaba avabshshshbabahsjsjajajjajajjajjaja

The total energy is conserved within isolated system.

In an isolated system, there is no exchange of matter or energy with the surroundings. Therefore, the total energy within the system remains constant, meaning that energy is conserved within the system.

In contrast, in an open system, there can be an exchange of both matter and energy with the surroundings, so the total energy within the system is not necessarily conserved.

In a closed system, there can be an exchange of energy but not matter, so the total energy within the system is conserved as long as there is no work being done by or on the system. In a connected system, the term is not commonly used in the context of energy conservation.

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Answer:

Q = 282,000 J

Explanation:

Given that,

The mass of liquid water, m = 125 g

Temperature, T = 100°C

The latent heat of vaporization, Hv = 2258 J/g.

We need to find the amount of heat needed to vaporize 125 g of liquid water. We can find it as follows :

[tex]Q=mH_v\\\\Q=125\ g\times 2285\ J/g\\\\Q=282250\ J[/tex]

or

Q = 282,000 J

So, the required heat is 282,000 J .

Answer:

e)

Explanation:

i)

        [tex]V = I*r_{i} + I*R_{1} (1)[/tex]

      [tex]I_{i} = \frac{V}{r_{int} + R_{i}} = \frac{1.5V}{0.1 \Omega + 1.4 \Omega} = 1.0 A (2)[/tex]

ii)

       [tex]I_{ii} =\frac{V_{term} }{R_{ii} } =\frac{3.6V}{1.8 \Omega} = 2.0 A (3)[/tex]

iii)

      [tex]I_{iii} =\frac{V-V_{term}}{r_{int} } =\frac{12.0 V- 11.0 V}{0.2 \Omega} =\frac{1.0V}{0.2\Omega} = 5.0 A (4)[/tex]

Explanation:

100.8 km/h × (1000 m/km) × (1 h / 3600 s) = 28 m/s

Answer:

28 m/s

Explanation:

100.8km/hr * 1hr/3600sec* 1000m/km= 100.8*1000/3600 m/s

1. because A is more negative than B. A is -1000 V (we can imagine that A has excess 1000 electrons), in other, B which +3000 V can be assume that B need 3000 elctrons to be neutral. So, the electron will flow from A to B.

2. Electrons being negatively charged flow from the negative terminal to the positive terminal of the voltage source. So, the actual direction of current should be from negative to positive terminal. However, the conventional direction had already been established. So, the current flow is considered in the direction opposite to the direction of flow of electrons. (from topperlearning dot com)

Answer: Increase the charge of one particle by a factor of 16

Explanation:Just took the quiz

Answer:

C. Increase the charge of one particle by a factor of 16.

they are formed when hot

it's dependent on the rate of cooling of the melt, slow cooling allows large crystals to form, fast cooling yields small crystals. They cool too quickly to form crystals.

Hope this helps! <3 :3