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Answer:

1200m/s

Explanation:

initial velocity=72km/h=20m/s

Final velocity=40m/s

Distance=0.5m

Now,

2as=v^2-u^2

or,2*a*0.5=40^2-20^2

or,1a=1200

or,a=1200/1

therefore,acceleration=1200m/s

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Answer:

atom has become cation

atom has lost 2 electrons

Explanation:

when atom loses electron they become positively charged and cation are positive ion

Answer:

a)20 m,2s

Explanation:

Given

Initial velocity=20 m /sec

g=10 m/s square

v =0m/s

h =?

t =?

now,

v = U +gt

=v=20 +10t

Or,10t=20

Or,t=20

10

therfore ,2 s.

Again,

h=ut -1 gt square

2

Or, h=20×2-1×10(2)square (multiply and cut )2×5 =10

; 2

Or,40-5×4

therefore , 20m

Answer:

745.4K ~ 472.3 C

Explanation:

This is an Ideal Gas Law problem where we have to manipulate the equation a bit. Let's start with the basic:

PV = nRT will be used for both the initial and final, so we will rearrange this problem to state:

(V(initial))/(T(Initial)) = nR/P

Since we know that the pressure, number of moles of He, and ideal gas constant (R) remain the same from start to finish so we can write the problem as such:

(V(initial))/(T(Initial)) = nR/P = (V(final))/(T(final))

                             or

(V(initial))/(T(Initial)) = (V(final))/(T(final))

Now lets define some of these values:

T(initial) = 25degree (assuming degrees Celsius) ~ 298.15K

V(initial) = 2.0L

V(final) = 5.0L

T(final) = ?

Since we are solving for T(final) let's rearrange the problem once more to be solving for T(final):

T(final) = (V(final)T(Initial))/V(initial)

Now plug in your values:

T(final) = (5.0L*298.15K)/(2.0L) ~ 745.4K ~ 472.3degrees Celsius

Answer:

d

Explanation:

it should divide the weight by 4 because there is 2 pivots

Answer:

Having begun as a "science of mental life", psychology evolved in the 1920's into the "scientific study of observable behavior". ... Today's science emphasizes the interaction of genes and experiences in specific environment

Answer:

Psychology continues to develop over the years all the way up to today by new and better scientific like science emphasizes. Also new experiences in specifics enviroment.

Explanation:

Hope it helped :)

Answer:

the rate of change in velocity per unit time is called acceleration

Answer:

70

Explanation:

the SI unit of energy is the joule (J) . the joules has base units of kg•m^2/s^2=N•m. A joule is defined as the work done or energy required to exert a force of one Newton for a distance of one metre.

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a). (2.0 x 10^9) x (0.1) = 2.0 x 10^8 cubic meters

b). The edge of a cube with that volume is

(2.0 x 10^8) ^ 1/3 = about 585 metres

(about 0.36 of a mile)

==> I'm pretty sure there are actually more than 2 billion adults in the world, since the total population is well over 7 billion now.

Answer:

b and c are the answers

A is an opinion, D is a superstitious belief because they haven’t found Jesus obviously

Answer:

1 Mole

Explanation:

The molecular weight of H2O is 18grams/mole. The conversion from grams to moles looks something like this:

18grams H2O (1moleH2O/18grams H2O) = 1 mole

Answer:

i hope it helped U

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A student puts a beaker of warm water next to a beaker of cold water so that they touch it. the two statements that are true are the thermal energy will move from warm water to cold water and the thermal energy will move from air to cold water, therefore option B and option D are the correct statements about the given problem statement.

It is a temperature at which the pressure exerted by the external atmosphere is equal to the vapor pressure of the substance.

The boiling point depends on atmospheric pressure, temperature, bond strength, and vapor pressure of the liquid.

As the water is boiling it means it has more thermal energy contained in it than the surrounding air and the ice is present at zero degrees.

As we know that heat is always transferred from the higher thermal potential to the lower thermal potential. The warm water has a higher thermal potential; than the cold water and the surrounding air has a higher thermal potential than the cold water.

As per the given problem statement, a student puts a beaker of warm water next to a beaker of cold water so that they touch it. the two statements that are true are the thermal energy will move from warm water to cold water and the thermal energy will move from air to cold water, therefore option B and option D are the correct statements about the given problem statement.

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a ) v = v o + a t  ( the acceleration will be negative )

9.50 = 16.0 + a * 1.2

a * 1.2 = -16.0 + 9.50

a * 1.2 = - 6.5  

a = - 6.5 : 1.2

a = - 5.4167 m/s²

F = m * a = 950 kg * 5.4167 m/s²

F = 5,145.8 N ( the average force exerted on a car during braking )

b ) d = v o - a t² / 2

d = 16.0 * 1.2 - ( 5.4167 * 1.2² / 2 ) =

= 19.20 - 3.90 = 15.30 m

Answer:

Object D

Explanation:

Use Newton's Second Law to determine the acceleration that each object has.

The force applied in both cases is 50 N, but the mass for object C and object D is different.

Let's start with object C first:

The acceleration object C undergoes is 5 m/s².  

Now let's calculate object D next:

The acceleration object D undergoes is 25 m/s².

Object D has greater acceleration because it has a smaller mass. The object with a smaller mass will accelerate more in order to satisfy Newton's 2nd Law.

Answer:

Explanation:

like charges repel each other if one group of electrons has more mass it will push the other smaller mass of electrons away

Answer:

Divide by 1609

Explanation:

So to convert from m/s to m/s divide by 1609

Answer:

Density is 8 g/cm³

Explanation:

[tex]density = \frac{mass}{volume} \\ [/tex]

mass » 80 g

volume » 10 cm³

[tex]density = \frac{80 \: g}{10 \: {cm}^{3} } \\ \\ = 8 \: {gcm}^{ - 3} [/tex]

Answer:

mass=80

volume=10

density=mass/volume

which is 80/10

so the density is equals to 10.

Answer:…..

Explanation:

The quantity of heat energy supplied to the water from the metal is 2520 J.

The quantity of heat energy needed to increase the temperature of one kilogram of a substance by one degree Celsius is known as the substance's specific heat capacity.

Here,

Mass of the water in the container, m = 50 g = 0.05 kg

Initial temperature of the water, T₁ = 20°C = 293 K

Final temperature of the water, T₂ = 32°C = 305°C

Specific heat capacity of water, C = 4200 J/kgK

The expression for the quantity of heat energy supplied to the water from the metal is given by,

Q = mcΔT

Q = mC(T₂ - T₁)

Applying the values of m, C, T₁ and T₂

Q = 0.05 x 4200 (305 - 293)

Q = 210 x 12

Q = 2520 J

Hence,

The quantity of heat energy supplied to the water from the metal is 2520 J.

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We have that Chloride is  is a negatively charged ion

Giving the the correct option as

Option B

From the Question we are Given

Chlorite

This is a form sheet silicate minerals that grown in nature

Chloride

This is  is a negatively charged ion

Chlorate

This is a positively charge ion

Chlorine

This is an element that has an atomic number of 17

Therefore

Chloride is  is a negatively charged ion

Giving the the correct option as

Option B

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Answer:

The atmosphere exerts pressure of about 10 power 5 and Nm power-2 or 760 mm of HG at sea level is known as standard atmospheric pressure

Answer:

(atm) unit of measurement equal to air pressure at sea level, about 14.7 pounds per square inch. Also called standard atmospheric pressure. atmospheric pressure. Noun. force per unit area exerted by the mass of the atmosphere as gravity pulls it to Earth.

The area which touches the sand floor of 4 feet of the bull is less than the man.

because the area of surface of contact is more in bull than in man. More is the area of contact, leads is the force or pressure affected.

Answer:

0.00025km

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Answer:

282.84 m toward Northwest

Explanation:

d = √(500-300)² + (400-200)²

=√(200²+200²)

= √(40000+40000)

= √ 80000

= 282.84 m

direction => Northwest

-

[tex]d = \sqrt{(500 - 300)^2 + (400 - 200)^2 } [/tex]

[tex]d = \sqrt{200^{2} + 200 ^{2} } [/tex]

[tex]d = \sqrt{40.000 \times 2} [/tex]

[tex]d = \sqrt{80.000} [/tex]

[tex]d \approx 282,84 m[/tex]

Answer:

The carbon atom has unique properties that allow it to form covalent bonds to as many as four different atoms, making this versatile element ideal to serve as the basic structural component, or “backbone,” of the macromolecules.

Carbon is said to provide a “backbone” in many molecules because Carbon atoms can form chains and branches with each other, and other atoms can attach to these, therefor the correct answer is option A

The chemical compound is a combination of two or more either similar or dissimilar chemical elements, for example, H₂O is a chemical compound made up of two oxygen atoms and a single hydrogen atom.

As given in the problem carbon is said to provide a “backbone” in many molecules because Carbon atoms can form chains and branches with each other, and other atoms can attach to these.

The fact that carbon atoms may share electrons with one another to build lengthy chains with other carbon atoms accounts for the enormous variety of organic molecules. Catenation is a characteristic of carbon that makes it special. By transferring their valence electrons to neighboring carbon atoms, carbon atoms can create lengthy chains.

Thus, therefore the correct answer is option A

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Taking into account the definition of speed, you get that the average speed of the entire trip is 53.33 [tex]\frac{mi}{hr}[/tex] .

It is necessary to know that speed ​​is a quantity that expresses the relationship between the space traveled by an object and the time used for it.

In other words, speed can be defined as the amount of space traveled per unit of time with which a body moves and can be calculated using the expression:

[tex]speed= \frac{distance traveled}{time}[/tex]

In this case, you know that the shipping mall is 40 miles from the woman's house and that she is going to the mall and back home. So it runs the 40 miles of distance twice. So the distance traveled is 80 miles.

On the other hand, you know that on the trip to the mall she averages 80 [tex]\frac{mi}{hr}[/tex]. Since the woman travels the first 40 miles at that speed, and taking into account the definition of speed, the time it takes to go to the shopping mall is calculated as:

[tex]80\frac{mi}{hr} = \frac{40 mi}{time}[/tex]

Solving:

time× 80 [tex]\frac{mi}{hr}[/tex]= 40 mi

[tex]time = \frac{40 mi}{80\frac{mi}{hr}}[/tex]

time=0.5 hr

Finally, you know that on the return trip she averages just 40 [tex]\frac{mi}{hr}[/tex]. Since the woman travels the second 40 miles at that speed, and taking into account the definition of speed, the time it takes to return to her home is calculated as:

[tex]40\frac{mi}{hr} = \frac{40 mi}{time}[/tex]

Solving:

time× 40 [tex]\frac{mi}{hr}[/tex]= 40 mi

[tex]time = \frac{40 mi}{40\frac{mi}{hr}}[/tex]

time=1 hr

Then, the total time of the trip, which consists of going to the shopping mall and returning home, is calculated as:

total time= 0.5 hr + 1 hr

total time= 1.5 hr

Finally, taking into account the definition of speed, average speed of the trip is calculated as:

[tex]speed= \frac{80 miles}{1.5 hr}[/tex]

Solving:

speed= 53.33 [tex]\frac{mi}{hr}[/tex]

In summary, the average speed of the entire trip is 53.33 [tex]\frac{mi}{hr}[/tex] .

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Answer: Developed nations are generally categorized as countries that are more industrialized and have higher per capita income levels. ... Developing nations are generally categorized as countries that are less industrialized and have lower per capita income levels.

Explanation: this is the source that i used to find the answer:

https://study.com/academy/lesson/economic-inequality-differences-in-developed-and-developing-nations.html

The distance fallen by the object at the instant when its kinetic energy has doubled is 5.097m

The kinetic energy of an object is the energy possessed by the body by virtue of its motion.

The gravitational potential energy (energy due to the virtue of its position) of a body is being converted to Kinetic energy once an object falls.

Using the law of conservation of energy according to the equation:

Kinectic Energy = Potential Energy

Since PE = mgh

KE = PE = mgh

Given the following parameters

KE = 100J

m = 2kg

g = 9.81m/s²

Required

Height h

Substitute the required values into the formula

100 = 2(9.81)h

h = 100/19.62

h = 5.097m

Hence the distance fallen by the object at the instant when its kinetic energy has doubled is 5.097m

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