hey! please help i’ll give brainliest!

Answer:

7.5 × 10^-11 m

Explanation:

Hope this helps !

Answer:

D

Explanation:

Answer:

The number of moles of air that escape is approximately 0.027 moles

Explanation:

The room temperature, T₁ = 20 °C = 298.15 K

Atmospheric pressure, P₁ = 1.0 atm

The volume of the container, V₁ = 3.5 L

The final temperature of the air in the container after heating on the Bunsen burner, T₂ = 95 °C = 368.15 K

The container opened finally

The ideal gas equation is P·V = n·R·T

∴ n = P·V/(R·T)

Where;

R = The universal gas constant = 0.08205 L·atm/(mol·K)

Therefore, we get;

n₁ = 1.0 × 3.5/(0.08205 × 298.15) ≈ 0.143

The number of moles, n₁ ≈ 0.143 moles

When the gas is heated to 95 °C, the number of moles becomes

n₂ =  P₂·V₂/(R·T₂)

P₂ = 1.0 atm atmospheric pressure, V₂ = 3.5 L, the volume of the container, T₂ =

∴ n₂ = 1.0 × 3.5/(0.08205 × 368.15) ≈ 0.116

The number of moles of air remaining in the container, n₂ ≈ 0.116 moles

The number of moles of air that escape, n = n₁ - n₂

∴ n = 0.143 - 0.116 = 0.027

The number of moles of air that escape, n ≈ 0.027 moles

Answer:

False

Explanation:

It is also tall.

Genotype is a way to describe the combination of alleles that an individual has for a certain gene (Table below). For each gene, an organism has two alleles, one on each chromosome of a homologous pair of chromosomes (think of it as one allele from Mom, one allele from Dad). The genotype is represented by letter combinations, such as TT, Tt, and tt.

Answer:

1. A

2. C

3. A

Explanation:

I'm so sorry if I am wrong

Answer:

[tex]0.84\:\text{s}[/tex]

Explanation:

The impulse-momentum theorem states that the impulse on an object ([tex]F\Delta t[/tex]) is equal to the change in momentum of that object ([tex]\Delta p[/tex]).

Set up the following equation:

[tex]F\Delta t=\Delta p[/tex]

Solving for change in momentum:

The momentum of an object is equal to [tex]p=mv[/tex], where [tex]m[/tex] is the mass of the object and [tex]v[/tex] is the velocity of the object. Since the person's final velocity will be zero, their final momentum will also be zero. Therefore, the person's change in momentum is [tex]68\cdot 27-0=1836\:\text{kgm/s}[/tex].

Solving for time:

[tex]2180\cdot\Delta t = 1836,\\\Delta t =\frac{1836}{2180},\\\Delta t =\boxed{0.84\:\text{s}}[/tex]

Answer:

If the engineers know that the

If the engineers know that themaximum force that a person can safely withstand is 2180 N, approximately, 0.84 second is required to crumple the barrier to safely slow the person

is required to crumple the barrier to safely slow the personwith this force.

Answer:

R2 = 300 Ohms

Explanation:

Let the two resistors be R1 and R2 respectively.

RT is the total equivalent resistance.

Given the following data;

R1 = 100 Ohms

RT = 75 Ohms

To find R2;

Mathematically, the total equivalent resistance of resistors connected in parallel is given by the formula;

[tex] RT = \frac {R1*R2}{R1 + R2} [/tex]

Substituting into the formula, we have;

[tex] 75 = \frac {100*R2}{100 + R2} [/tex]

Cross-multiplying, we have;

75 * (100 + R2) = 100R2

7500 + 75R2 = 100R2

7500 = 100R2 - 75R2

7500 = 25R2

R2 = 7500/25

R2 = 300 Ohms

That depends on the values of the resistors.

If the same two resistors are used in both cases, then the total resistance is more in series and less in parallel.

Here's a catchy little factoid for ya:

-- In series, the total resistance is more than the biggest single one.

-- In parallel, the total resistance is less than the smallest single one.

Explanation:

8. Real and inverted

9. Concave mirror

Answer:

infrared will do but I'm not sure this question is hard if I may say and we cannot take green because it is the colour that the concept must have

Answer: See explanation

Explanation:

According to clinical psychology, an abnormal behavior is when an act results in a significant distress and is deviant from the normal practice.

In this case, while the whole class is cheating, one student isn't. This shows that the student is deviating from what every other person is doing. Since the student deviates from the norm, it's an abnormal behavior.

Answer:

The reason he might be exhibiting abnormal behavior is the fact that everyone except him is cheating on a test. He is the odd one out and due to this he might be anxious/nervous. Perhaps he thinks that since he is the only one not cheating that he might get a bad grade cause the teacher will assume he is cheating aswell. Another might be that he does not like being singled out. It's out of the norm and he does not particularly like it.

Explanation:

Take this and alter it to your liking. It got me a 100%!

Answer:

D. elliptical galaxy

Explanation:

Hope this helps :)

Answer: No

The Law of Conservation infers that the matter within a system will perserve its quantity (less there's an outside factor which disrupts the system). There should be more Cl within the products side of the equation, and more Br within the reactants side (there should be general adjustment to make this problem balanced), so that the matter is equal in quantity within both sides of the equation.

Answer:

kE=1/2mv^2

Explanation:

here

KE= 15000j

velocity =20m/s

mass=?

now

mass=

15000×2= (m)20^2

30000=m ×400

30000÷400=m

Mass (m)= 75

therefore mass is 75kilogram

Answer:

Resistors restrict current flow through a circuit.

(The electrons don't easily get from one side to the other)

High voltage is actually needed for to send power over long distances because if you use high current, a lot of the power is lost to the resistance in the wires.

Explanation:

hope it helps <3

1/do + 1/di = 1/f

blah blah blah why does the answer have to be 20 characters long

Answer:

Wheel and axle consists of two coaxial cylinders of different diameters. Various examples of wheel and axle are used in our daily life. Some examples of such wheel and axles are string-roller, screwdriver, MADANI, ROTE PING, spanners, knobs of a door, steering of vehicles etc. Most of them are used for magnifying effort but some are also used to gain speed like MADANI and ROTE PING. In wheel and axles, usually effort is applied on big cylinder called wheel and is overcome bya small cylinder called axle.

Answer:

Explanation: The wheel and axle

a machine consisting of a wheel attached to a smaller axle so that these two parts rotate together in which a force is transferred from one to the other.

P = 5 watt

Explanation:

P = VI

= (10 volt)(0.5 A)

= 5 watt

The electric power developed by the lamp will be 5 watts. Electric power is found by the multiplication of voltage and electric current.

Electric power is the product of the voltage and current. Its unit is the watt.

The given data in the problem is;

The voltage is,V = 10 volt (V)

The electric current is,I = 0.5 ampere (A)

The formula for the power is given as;

[tex]\rm P= V I \\\\\ P= 10 \times 0.5 \\\\ P= 5 \ watt[/tex]

Hence electric power developed by the lamp will be 5 watts.

To learn more about the electric power refer to the link;

https://brainly.com/question/12316834

V = 200.16 volts

Explanation:

V= IR

= (1.39 A)(144 ohm)

= 200.16 volts

Answer:

200.16

Explanation:

acellus

Answer:

B

Explanation:

Answer:

Refraction is the correct option

Answer: refraction

Explanation: it is the bending of light rays as it moves from one medium to another.

Explanation:

m = 66 kg

a = 2 m/s²

F = .....?

= 66 . 2

= 132 N

Answer:

The answer is number 2 :)

Answer:

A

Explanation:

yeah physics

Accerelation is the same of everything, regardless of mass. The only thing that affects is aerodynamics of the thing

[tex] \mathfrak{\huge{ \mathfrak{  \underline{ Answer }}}\:  ✓ }[/tex]

We know, hot water has more energy than the cold water , so when cold water is added in the beaker then heat transfer occurs from hot water to cold water to balance the Energy, causing the drop of temperature from 70° C to 40° C.

Note : Heat transfers occurs from hotter object to cooler one.

_____________________________

[tex] \mathrm{ \#TeeNForeveR}[/tex]

Answer:

C. Particles that make up a nucleus

Explanation:

A P E X

Answer:

The bird and the arrow are 84.621 meters far from the hunter.

Explanation:

The arrow experiments of a parabolic motion, which is the combination of horizontal motion at constant velocity and vertical uniform accelerated motion. The arrow strikes the bird when it reaches its maximum height. First, we determined the time taken by the arrow before striking the bird:

[tex]v = v_{o}\cdot \sin \theta + g\cdot t[/tex] (1)

Where:

[tex]v_{o}[/tex] - Initial speed of the arrow, in meters per second.

[tex]v[/tex] - Final speed of the arrow, in meters per second.

[tex]\theta[/tex] - Launch angle, in sexagesimal degrees.

[tex]g[/tex] - Gravitational acceleration, in meters per square second.

[tex]t[/tex] - Time, in seconds.

If we know that [tex]v_{o} = 40\,\frac{m}{s}[/tex], [tex]\theta = 30^{\circ}[/tex], [tex]g = -9.807\,\frac{m}{s^{2}}[/tex], [tex]v = 0\,\frac{m}{s}[/tex], then the time taken by the arrow is:

[tex]t = \frac{v-v_{o}\cdot \sin \theta}{g}[/tex]

[tex]t = \frac{0\,\frac{m}{s}-\left(40\,\frac{m}{s}\right)\cdot \sin 30^{\circ} }{-9.807\,\frac{m}{s^{2}} }[/tex]

[tex]t = 2.039\,s[/tex]

And the initial horizontal distance of the arrow ([tex]x_{i}[/tex]) is determined by this kinematic formula:

[tex]x_{i} = (v_{o}\cdot \cos \theta)\cdot t[/tex] (2)

If we know that [tex]v_{o} = 40\,\frac{m}{s}[/tex], [tex]\theta = 30^{\circ}[/tex] and [tex]t = 2.039\,s[/tex], then the initial horizontal distance is:

[tex]x_{i} = \left[\left(40\,\frac{m}{s} \right)\cdot \cos 30^{\circ}\right]\cdot (2.039\,s)[/tex]

[tex]x_{i} = 70.633\,m[/tex]

There is an inelastic collision between the arrow and the bird, the initial velocity of the bird-arrow system is:

[tex]v = \frac{m_{A}\cdot v_{o}\cdot \cos \theta}{m_{A}+m_{B}}[/tex] (3)

Where:

[tex]v[/tex] - Initial velocity of the bird-arrow system, in meters per second.

[tex]m_{A}[/tex] - Mass of the arrow, in kilograms.

[tex]m_{B}[/tex] - Mass of the bird, in kilograms.

If we know that [tex]m_{A} = 0.5\,kg[/tex], [tex]m_{B} = 2\,kg[/tex], [tex]v_{o} = 40\,\frac{m}{s}[/tex] and [tex]\theta = 30^{\circ}[/tex], then the initial velocity of the bird-arrow system is:

[tex]v = \frac{(0.5\,kg)\cdot \left(40\,\frac{m}{s} \right)\cdot \cos 30^{\circ}}{0.5\,kg + 2\,kg}[/tex]

[tex]v = 6.928\,\frac{m}{s}[/tex]

And the maximum height reached by the arrow ([tex]y[/tex]), in meters, is:

[tex]y = y_{o} + (v_{o}\cdot \sin \theta)\cdot t +\frac{1}{2}\cdot g\cdot t^{2}[/tex] (4)

Where [tex]y_{o}[/tex] is the initial height of the arrow, in meters.

If we know that [tex]y_{o} = 0\,m[/tex], [tex]v_{o} = 40\,\frac{m}{s}[/tex], [tex]\theta = 30^{\circ}[/tex],  [tex]g = -9.807\,\frac{m}{s^{2}}[/tex] and [tex]t = 2.039\,s[/tex], then the maximum height reached by the arrow is:

[tex]y = 0\,m + \left(40\,\frac{m}{s} \right)\cdot (2.039\,s)\cdot \sin 30^{\circ} +\frac{1}{2}\cdot \left(-9.807\,\frac{m}{s^{2}}\right)\cdot (2.039\,s)^{2}[/tex]

[tex]y = 20.394\,m[/tex]

Time needed by the bird-arrow system to land is determined by this expression based on (4):

[tex]y = y_{o} + (v_{o,y})\cdot t +\frac{1}{2}\cdot g\cdot t^{2}[/tex]

If we know that [tex]y_{o} = 20.394\,m[/tex], [tex]y = 0\,m[/tex], [tex]v_{o,y} = 0\,\frac{m}{s}[/tex] and [tex]g = -9.807\,\frac{m}{s^{2}}[/tex], then the time needed to land is:

[tex]0\,m = 20\,m + \left(0\,\frac{m}{s} \right)\cdot t + \frac{1}{2}\cdot \left(-9.807\,\frac{m}{s^{2}} \right)\cdot t^{2}[/tex]

[tex]t = 2.019\,s[/tex]

And the horizontal distance travelled by the bird-arrow system ([tex]x_{ii}[/tex]), in meters, is calculated from a formula based on (2):

[tex]x_{ii} = v_{o, x}\cdot t[/tex]

If we know that [tex]v_{o,x} = 6.928\,\frac{m}{s}[/tex] and [tex]t = 2.019\,s[/tex], then the distance travelled by the bird-arrow system is:

[tex]x_{ii} = \left(6.928\,\frac{m}{s} \right)\cdot (2.019\,s)[/tex]

[tex]x_{ii} = 13.988\,m[/tex]

The final distance of the bird-arrow system from the hunter is:

[tex]x = x_{i} + x_{ii}[/tex]

[tex]x = 70.633\,m + 13.988\,m[/tex]

[tex]x = 84.621\,m[/tex]

The bird and the arrow are 84.621 meters far from the hunter.

Answer:

Environmental Protection Agency (EPA)

Explanation:

In the United States of America, the agency which was established by US Congress and saddled with the responsibility of overseeing all aspects of pollution, environmental clean up, pesticide use, contamination, natural resources and hazardous waste spills is the Environmental Protection Agency (EPA). Also, EPA research solutions, policy development, and enforcement of regulations through the resource Conservation and Recovery Act.

The Environmental Protection Agency (EPA) is the governmental agency set up to ensure that various industries, factories and people comply with laws and regulations concerning the environment i.e it is an agency established to oversee and enforce environmental compliance by the people.

Hence, the Environmental Protection Agency (EPA) is saddled with the responsibility of enforcing federal and state laws related to environmental and natural resources.

Venn diagram should be titled traditional physics

Based on the Venn Diagram, Title 1 should be Quantum Mechanics, and Title 2 should be Traditional Physics.

A Venn Diagram is a diagram which shows the similarities as well as differences between two or more items.

Overlapping points show similarities while non-overlapping points show differences.

The Venn Diagram above illustrates Traditional physics and quantum mechanics.

Title 1 is quantum mechanics and Title 2 is Traditional physics.

Therefore, the Venn Diagram illustrates the difference and similarities between quantum physics and traditional physics.

Learn more about Venn Diagram at: https://brainly.com/question/2099071

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