Which equation shows that mass is conserved in the chemical
reaction?
a 3N₂ + H₂ → 2NH3
b N₂ + H₂ → NH3
c N₂ + 2H2 → 3NH3
d N₂ + 3H2 → 2NH3

Gravity, friction, and drag force are the forces that are acted on a car.

Gravity is defined as a force by which one body attracts other objects toward its center. Friction is the force that resists the relative motion of solid surfaces, fluid, and material that are sliding against each other. There are several types of friction force i.e. Dry friction is a type of force that opposes the relative motion of two solid surfaces that are in contact with each other.

Drag is a mechanical force that is generated by the interaction and physical contact of a solid body with a liquid or gas. It is not produced by a field force, gravitational field, or an electromagnetic field, in which one object can affect another object without any physical contact with each other.

So we can conclude that the forces acting on the car are gravity, friction and drag force.

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A psychologist differ from a biologist in that a psychologist deals with helping people solve their emotional and mental problems by way mind analysis while biologists are scientists who studies living organisms.

Biology refers to the study of life. Someone who studies biology is called a biologist.

The biologists helps us to understand the following:

So therefore, a biologists helps us understand all about plants and animals while the psychologists deals with studying human minds.

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Im not sure but no one can kek lskhd. akshd

Sunlight will take 8 minutes to reach the Earth.

Sunlight is part of the electromagnetic radiation emitted by the Sun, especially infrared, visible and ultraviolet light.

Light is travelling with the speed of [tex]3 * 10^{8}[/tex] m/s

Distance between Sun and Earth is 144 million km

1 km = 1000 m

1 million km = [tex]10^{6}[/tex] km

[tex]10^{6}[/tex] km = [tex]10^{9}[/tex] m

144 million km = 144 * [tex]10^{9}[/tex] m

According to the speed, distance and time relationship, speed is directly proportional to the ration of distance and time.

[tex]3 * 10^{8} = \frac{144 * 10^{9} }{Time}[/tex]

Time = [tex]\frac{144 * 10^{9} }{3* 10^{8} }[/tex]

Time = 480 sec

Time = 8 minutes

Time taken by the sunlight to reach the Earth's surface is 8 minutes.

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Answer:

See below

Explanation:

x = time     y = position (displacemet)

Some fats are good for you like Monounsaturated ( A ) and Polyunsaturated ( C ) fats.

Monounsaturated and Polyunsaturated fats lower the risk of disease. These are good unsaturated fats. Foods that are rich in good unsaturated fats are fish, seeds, nuts and vegetable oils. Some of the vegetable oils that are good for health are olive, canola, sunflower, soy and corn oil.

Hydrogenated oil produces trans fat. If trans fat is taken even in small quantities, it increases disease risk. Food items rich in saturated fats are butter, cheese, ice cream, coconut oil etc. Eventhough these are not as harmful as trans fats, it is better to be consumed in moderate quantities.

Therefore, some fats are good for you like Monounsaturated ( A ) and Polyunsaturated ( C ) fats.

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Due to the gas within cooling off due to the low temperature, the balloon's volume shrinks.

The helium balloon rises because it is lighter than the same amount of air at ambient temperature. It is heavier than the same volume of air at low temperatures because its volume is too small. Because the average kinetic energy of the gas molecules in a balloon drops as temperature rises, the frozen balloon shrank. As a result, the molecules move more slowly and collide with the balloon's interior wall less frequently and weakly, causing the balloon to somewhat contract.

If the temperature remains constant and the pressure decreases, the volume will increase (balloon expands). If the pressure increases while T remains constant (let's say you're holding the balloon underwater), V will decrease (balloon shrinks). When the temperature rises and the volume remains constant (like in an aerosol can), P increases.

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Rock, metal, ice, and gas are distributed in the solar system in an orderly manner.

Numerous tiny things in the Solar System are orbiting the Sun, including an unknown number of dwarf planets. Natural satellites, also known as "moons" after the Moon of Earth, orbit the six major planets, the six largest dwarf planets, and many of the smaller worlds. Jupiter's moon Callisto is almost as big as Mercury, the smallest terrestrial planet, and two natural satellites, Saturn's moon Titan and Jupiter's moon Ganymede, are both larger but not more massive than Mercury. Solar System is around the earth.

Planetary rings made of ice, dust, and moonlets surround each of the large planets as well as a few minor worlds. Objects made of rock, metal, and ice can be found in the asteroid belt, Solar System is located between the orbits of Mars and Jupiter.

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Answer:

Γ = r x F      vector notation for torque

Doubling r (the length) will double the torque applied

Answer:

colder because of moisture

The current in the filament is halved following the doubling of its length.

Let the current flowing in the filament as I, the electric field in the conductor is E and the length of the conducting filament is L.

We know from ohm's law,

I = V/R

where V is the potential difference and R is the resistance of the conductor,

We also know,

R = ρL/A

where ρ is the resistivity of the conductor and the A is the area of the conductor,

I = VA/ρL

I/A = V/ρL

I = AE/ρ

if area and resistivity are constant,

I ∝ E

Here E = V/L

If V = constant,

E ∝ 1/L

Means we can conclude,

I ∝ E ∝ 1/L

So we can tell that on doubling the length of the filament will decrease the current by half.

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There are three factors that affect gravitational potential energy:

Gravitational potential energy is potential energy an object holds when falls towards another object due to gravity.

for instance, if we lift a stone and try to throw it from a height, it will have gravitational potential energy whereas stones in the ground have no gravitational potential energy.

the formula of GPE:  E = mgh where

m = mass, g = gravity and h = height

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Answer:

battery

Explanation:

A battery establishes an electric potential difference.

Answer:

D) Battery

Explanation:

Battery is a source that produces electric charges with different concentrative regions

[tex].[/tex]

Convection differs from radiation in the sense that in radiation, matter is not involved. Option D.

The term heat transfer has to do with the movement of heat from one point another. Recall that heat transfer is one of the things that does occur in nature. There are three kinds of heat transfer that occur in nature and these are;

Let us recall that in the process of convection, there is the movement of heat from one point to the other via the actual movement of the particles of the substance.  On the other hand, radiation occur when heat is transferred without an movement or contact between the objects  between which the heat is transferred. Thus, when air masses are moving, it is a process of convection taking place.

Hence, the difference between conduction and radiation is that matter is involved in convection but not in radiation.

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The number of protons that strikes the target is  1.7325 x 10²² protons.

The quantity of a charge is the amount of charge or electron flowing over a given period of time.

Mathematically, the quantity of a charge is given as;

Q = It

where;

Q = (126 A) x (22 s)

Q = 2,772 C

The charge of the proton is 2,772 C.

The number of protons in a 2,772 C charge is calculated as follows;

1.6 x 10⁻¹⁹ C ---------> 1 proton

2,772 C ---------------> ?

= (2,772 x proton) / (1.6 x 10⁻¹⁹)

= 1.7325 x 10²² protons

Thus, we can conclude that during a period of 22 seconds, a total of .7325 x 10²² protons struck the target.

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Answer: (a) No we cannot able to move the electron with strong magnet field.

(b) yes we can able to move the electron with strong electric field

Explanation: Theoretically, both the gravitational and electric fields might speed up a travelling electron, but in most situations, only the electric field will do so significantly. Since the magnetic force is always perpendicular to the velocity, it will not affect the speed of an electron in motion.

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By applying a strong magnetic field, the electron will not travel. By applying an opposite electric field or the same electric field, the electron will move in a different direction, respectively.

The definition of an electric field is the electric force per unit of charge. It is assumed that the field's direction corresponds to the direction in which a positive test charge would experience force. The electric field is directed radially inward toward a negative point charge and radially outward from a positive charge. a circumstance present in the vicinity of a magnet or an electric current, defined by the presence of magnetic poles and a discernible magnetic field at every point in the vicinity.

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The pressure exerted by the girl on the ground if she stands on two feet is 18333.33 N/m².

The pressure exerted by the girl on the ground if she stands on two feet is calculated as follows from the formula of pressure.

Pressure is defined as the force per unit area or the ratio of force exerted and the area in which the force is exerted.

Mathematically;

Th unit of pressure is N/m²

The force exerted by the girl is equal to the weight of the girl

Force = 550 N

Area of one shoe = 150 cm²

Area of one shoe in m² =  150 cm² * 1 m²/10000 cm²

Area of one shoe in m² = 0.015 m²

Area of two shoes = 2 * 0.015 m² = 0.03 m²

Pressure = 550/0.03 N/m²

Pressure = 18333.33 N/m²

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Complete question:

A girl weighs 550 N. The girl is wearing shoes with an area of 150cm². What pressure will be exerted by the girl on the ground if she stands on two feet?

Answer:

1. Thermal Energy

Explanation:

Answer:

A physical balance can be used to measure both mass and weight of an object.

The car travels a distance of 75 m.

Given:

Initial velocity (u) = 0 m/s

Because the body stars from rest,

Time (t) = 5 sec

Final velocity = 15m/s

Using first equation of motion,

v = u + at

15 = 0 + a(5)

5a = 15

a = [tex]\dfrac{15}{5}[/tex]

a = 3 [tex]m/s^{2}[/tex]

∴Therefore Acceleration = 3m/s²

Using third equation of motion:-

s = Ut + ½ at²

s = (0 × 5) + ½ × 3 × (5)²

s = ½ × 3 × 25

s = [tex]\dfrac{75}{2}[/tex]

s = 37.5m

Hence the  Distance moved by the car  = 37.5 m

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The coefficient of kinetic friction between the book and the carpet is 0.23.

The coefficient of kinetic friction is the ratio of the friction force to the normal force experienced by a body moving on a dry, rough or non-smooth surface.

From Newton's second law of motion, the coefficient of kinetic friction is calculated as follows;

F - Ff = ma

where;

Since force of friction is the only force acting on the object, our final equation becomes;

-Ff = ma

-μmg = ma

-μg = a

-μ = a/g

μ = - a/g

The acceleration of the book is calculated as follows;

v² = u² - 2as

where;

When the book stops, the final velocity, v = 0

0 = u² + 2as

-2as = u²

-a = u²/2s

-a = (3.85²) / (2 x 3.25)

a = - 2.28 m/s²

Coefficient of kinetic friction = - (-2.28 m/s² / 9.8 m/s²)  = 0.23

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you have too high of a spin rate with your driver and irons.

The faster the swing speed the longer the distance from the tee. Therefore, to get the ball as far down the fairway as possible, you need to swing as hard as possible without losing balance posture, or control of the club. A softer ball provides more control on off-center shots and more distance on low-impact shots. I downgraded it a bit due to the high price.

These Titleist Tour golf balls are perfect for the beginner golfer who needs a lot of forgiveness on their shots. All in all the Pro is a seasoned athlete who hits the ball so far because he plays on the courts in the best possible conditions. Athletic golf skill maximizes swing speed, thereby maximizing distance. Fairway agronomy, on the other hand, pushes the ball farther. The reason taller golfers hit longer is primarily that their size provides a framework for greater leverage with more muscles and joints.

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Momentum of system remains conserved before and after the collision. Thus, a. Total momentum of system, p = 125kg-m/s

b. New momentum of first object, p = 100kg-m/s

c. Momentum transferred to 1.0kg object, p = 41.6kg-m/s

d. Final velocity of 1.0kg object, v = 41.6m/s

Given, mass of first object  [tex]m_{1}[/tex]= 5.0kg and mass of second object [tex]m_{2}[/tex] = 1.0kg

Velocity of first object [tex]v_{1}[/tex]= 25m/s and velocity of second object [tex]v_{2}[/tex] =0 m/s

Thus, Total momentum of the system, p = mv

[tex]p= m_{1} v_{1} +m_{2} v_{2}[/tex]

p = 5*25 + 1*0

p = 125kg-m/s

Now, after collision first object continues to move with final velocity 20m/s. Hence, new momentum, p = mv

p = 5*20

p = 100 kg-m/s

Momentum transferred to 1.0kg object, p= mv

where m = 1.0kg and v = final velocity of 1.0kg object

For calculating final velocity of second object,

[tex]v_{2f} = (\frac{2m_{1} }{m_{1} +m_{2} } )v_{1i}+ (\frac{m_{2}-m_{1} }{m_{1}+m_{2} } )v_{2i}[/tex]

[tex]v_{2f}[/tex]= [tex](\frac{2*5}{5+1} )25 + (\frac{1-5}{5+1} )[/tex]*0

[tex]v_{2f} = 41.6 m/s\\[/tex]

Thus, momentum transferred to 1.0kg object, p = mv

p = 1* 41.6

p = 41.6kg-m/s

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Answer:

use the equations of motion

The electric potential energy of the pair of charges when the second charge is at point b is U at b = +7.3×10⁻⁸J.

Electric potential is the amount of work done in moving point charge from infinity to aspecific point.

Calculation of the electric potential energy:

Here the particle should be moved from the point at the time when the potential energy should be U a

The U b should be the change in the potential energy

W is work done.

(W at a )-(W at b)  = U a - U b

U b = U a - (W at a )+(W at b)

So,

= 5.4 × 10⁻⁸J - ( -1.9×10⁻⁸ J)

= +7.3×10⁻⁸J.

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Answer:

V = 127.4 m/s

Explanation:

Using the following expression:

V = V₀ + a * t

Applying to vertical movement:

V = 0 + g * t  (Start at rest and a = g = 9.8 m/s²)

V = g * t

V = 9.8 * (13)

V = 127.4 m/s

So there are two types of friction one is kinetic friction which acts when car skid on icy pavement and other is rolling friction which acts which helps tire to roll along the surface now as we know that coefficient of rolling friction μr is greater than coefficient of kinetic friction μk  .

So due to which friction force will be more effective when tire rolls along the surface not skid so in order to stop car in minimum distance possible on icy pavement should apply brakes more gently.

Kinetic friction is defined as a force that acts between shifting surfaces. A body moving at the floor reviews a force in the opposite direction of its motion. The importance of the force will rely on the coefficient of kinetic friction among the two materials.

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The force acting on the object will be 32 N.

Newton's second law of motion states that, "the force is equal to the change in momentum per change in the time". The mathematical form of the law is given below.

[tex]F = \frac{dP}{dt}=\frac{d(mv)}{dt}=m\frac{dv}{dt}=ma[/tex]

Where P = momentum, t = time, m =mass, v = velocity, a = acceleration and F = force.

The mass of the object is 4 kg and acceleration is 8 m/s^2. Substitute the values in the equation and we will get the force.

F = ma

F = 4 kg * 8 m/s^2

F = 32 kg.m/s^2

F = 32 N

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C. The mass of the gases and the ash should equal the mass of the initial stack of newspapers. (conservation of mass)

Answer:

c

Explanation:

The elements which are in the unknown according to the diagram given is He and is therefore denoted as option C.

This is referred to as a type of graph which shows the intensity of light being emitted over a range of energies and it varies with properties such as wavelength or frequency. When light is passed through a prism, band of colors are usually observed which signifies light spectrum with the plural being spectra.

In the diagram given , the element He and the unknown have the most similar spectra observed as a result of the lines which fall in almost the same range and place and it makes it the most likely component of the mixture of unknown gases.

This is therefore the reason why option C was chosen as the most appropriate choice.

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