grade 9 psyhics giving brainly pls answer 13 and determine if 12 is correct​

To find the mass, with only the weight:

  ⇒ must consider the relationship between the mass and weight

     ⇒ (in other words) we must find the equation that has both the

         mass and weight

Based on our physics knowledge, we know:

 [tex]Weight=mass*gravitational_. acceleration[/tex]

Now let's plug in the values, and solve:

 [tex]147N = mass*9.8_.m/s^2\\mass = 15_.kg[/tex]

Answer: 15 kg

Hope that helps!

*as a note, if you use the gravitational acceleration as 10m/s², then the answer would be 14.7 kg

Answer:

set-up X

Explanation:

Assuming that both nails are iron and the charge of the battery is the same, set-up X has a stronger magnetic field.

The more coils [turns] made around a nail, the stronger the electromagnet / magnetic field will be because each coil/loop essentially sets up its own magnetic field.

Hope this helps!!

Explanation:

At a distance of 4.25 light years, Proxima is the closest-known star to our solar system. Science of the Alpha Centauri system. The two stars that make up Alpha Centauri, Rigil Kentaurus and Toliman, are quite similar to our sun

Jennifer is able to drag her brother out of the zoo due to an applied net force of 15 N.

Force refers to any agent which tends to cause a change in the motion or state of an object.

Forces are of two types;

The net force is the difference between two forces which causes a change in the motion of an object.

The net force that Jennifer applies = 35 N - 20 N = 15 N

Therefore, Jennifer is able to drag her brother out of the zoo due to an applied net force of 15 N.

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Answer:

The SI units used to describe energy is Joule (J)

Answer:

c. light from the sun is reflected back to us off the moon

Explanation:

the moon does not produce its own light

As stream discharge increases, only velocity increases.

The discharge or volume flow rate is defined as the product of the velocity of the fluid and the area of cross- section of the pipe or tube.

Discharge Q = Area A x Velocity V

Q = AV

The discharge is directly proportional to the velocity of the fluid. When discharge increases, velocity is the only physical quantity that can be changed.

Thus, As stream discharge increases, only velocity increases.

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Explanation:

Here,

Velocity of A=60km/hr

Velocity of B=80km/hr

Now,

Relative velocity of B with respect to A in the same direction=Velocity of B - Velocity of A

=80km/hr-60km/hr

=20km/hr

Answer:

20Km / hr

Explanation:

Here

velocity car A=60km/hr

velocity car A=60km/hrvelocity car B=80km/hr

Now

Relative velocity of B with respect to A in the same direction =velocity of B - velocity of A

= 80Km/hr - 60Km/hr

=20km/hr Ans

Answer:

a coil rotating in a magnetic field to change its flux

The reactance of the circuit will be 5.233×10⁻⁴ ohm. Inductive reactance is the product of 2 times π frequency and the coil inductance.

When alternating electricity passes through pure reactance, it causes a voltage drop that is 90 degrees out of phase with the current.

The letter “X” is used to represent reactance in mathematics, and it is measured in ohms.

The inductive reactance of a coil is calculated using the following formula:

Inductive reactance, or XL, is the product of 2 times p (pi), and the frequency of the ac current in hertz, and the coil inductance in henries.

XL= 2πfL

Where,

f {frequency)

L (Inductance)

The reactance of the circuit is found as;

[tex]\rm R_{new}=0.38[{(\frac{1}{60} )^2][/tex]

[tex]\rm R_{new}=1.055 \times 10^{-4} \ ohm[/tex]

The inductance of the circuit is;

[tex]\rm X_{new}=1.9(\frac{1}{60} )^2\\\\X_{new}= 5.233 \times 10^{-4}\ ohm[/tex]

Hence, the reactance of the circuit will be 5.233×10⁻⁴ ohm.

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Explanation:

friend I have solved it as we know that force = mass *acceleration and by the equations of motion

To solve this, we must be knowing each and every concept related to force and its calculation. Therefore, the amount of force applied in the car during the time is 6000N.

Nature is governed by four fundamental or universal forces. All stuff in the universe would disintegrate in the absence of these forces. Any pull or push that causes an item to change its physical condition is referred to as force (in terms of motion or deformity).

Mathematically,

V²-u²=2aS

V=72 km/h=72000/3600=20m/s

u=0m/s

s= 50 m

substituting all the given values in the above equation, we get

20²-0²=2×a×50

a=4m/s²

Force = mass ×acceleration

substituting all the given values in the above equation, we get

1500 kg=mass

Force = 1500 ×4

         =6000N

Therefore, the amount of force applied in the car during the time is 6000N.

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Answer:

Radiology plays a huge role in disease management by giving physicians more options, tools, and techniques for detection and treatment. Diagnostic imaging allows for detailed information about structural or disease-related changes. With the ability to diagnose during the early stages, patients may be saved.

Explanation:

Answer:

Explanation:

Comment

You have to read this carefully enough that you don't mix up energy and forces.

Gravity is a force. If you don't believe me try jumping off a building. Which way are you going to go and why? Down because gravity attracts your mass.

So Magnetism must be a force as well. It acts in one direction, but not a specific one the way gravity acts). It also either attracts or repulses (pushes an object away)

Answer A

Answer:

1/3 power

Explanation:

I'm just a smart guy

neutralization reactions occur when you combine two extremely reactive substances together for the purpose of rendering them inactive, or neutral.

Answer: H2O​ has hydrogen bonds, dipole-induced dipole forces, and London dispersion forces.

Explanation:

Answer:

The H2O water molecule is polar with intermolecular dipole-dipole hydrogen bonds. As the water molecules attract each other and form bonds, water displays properties such as high surface tension and a high heat of vaporization

Answer: A

Explanation:

Explanation:

20÷250 =12.5 and do it by using fourmulaes

If the elevator falls from a height of 240 meters and Superguy is 1 km away, he will have 6.5 seconds to save Lois, which means that his average speed must be 150 meters per second.

The total distance traveled by an object divided by the total time taken is the average speed.

The average speed of an object indicates the pace at which it will traverse a distance. The metric unit of speed is the meter per second.

Given data:

Distance of super guy from the tower = 1.00 km

height(h)= 240 m

From the Newtons' second equation of motion:

[tex]\rm S= ut+\frac{1}{2} at^2 \\\\\ 210 = 0+\frac{10}{2} t^2 \\\\ t= \sqrt 42\\\\t=6.5 \ sec[/tex]

Distance is the foundation as the product the velocity and time;

D=ut

u=d/t

u=1000/t

u=1000/6.5

u=150 m/sec

Hence, he will have 6.5 seconds to save Lois, which means that his average speed must be 150 meters per second.

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Answer:

1500 because i aded 500+500+500= 1500 km/hr thats how i got my answer

Explanation:

Answer:

1500 kmh

Explanation:

500+500+500 making it 1500

The three most important lessons learned in the school are never cheat, make less but selfless friends and respect teachers.

Critical thinking is the action done by the person that has a wide range of thinking skills that eventually leads to a desired outcome.

The important lessons one learn being in schools that are crucial forr the whole life are never cheat, make less but selfless friends and respect teachers.

Critical thinking makes one realize his inner potential. The potential is the desired outcome and it is the final objective of the person.

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The quarks that compose a baryon may have negative and positive charges of +(2/3)e, -(1/3)e.

A quark is a type of particle that forms protons and neutrons and combines to generate particles called hadrons.

Protons and neutrons may be formed by up quarks and down quarks that have a charge equal to -1/3e.

In conclusion, the quarks that compose a baryon may have negative and positive charges of +(2/3)e, -(1/3)e.

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Answer:

See below ~

Explanation:

The Mechanical Advantage (MA) is defined as the ratio between the force produced by the machine to the force applied to it.

=============================================================

So,

⇒ [tex]\frac{F(out)}{F(in)} = 2[/tex]

⇒ This means that the force produced is twice the applied force

If the charged particle moves in the magnetic field or electric field, then it experiences  magnetic force or electric force because of its magnetic or electric properties.

The magnetic field is the region of space where a charged object experiences magnetic force when it is moving.

When a charged particle such as an electron or proton moves inside a conductor, magnetic lines of force rotate around the particle. This relative motion causes the magnetic field to generate.

Thus, If the charged particle moves in the magnetic field or electric field, then it experiences  magnetic force or electric force because of its magnetic or electric properties.

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Answer:

If a magnetic or electric field is present, materials that generate these fields will interact by attracting or repelling each other because of their magnetic or electric properties.

Explanation:

The biomass energy can use improve water quality in soil erosion and sedimentation are decreased during biomass crop growth. The correct option is C.

Biomass energy is obtained by the processing of the dead plants and animal or vegetable, cow dung or wood.

The biomass energy obtained by these bio things, it is enriched with the nutrients required by the new crop plants to grow effectively.

The biomass energy provides good water quality by soil erosion and sedimentation.

Thus, The correct option is C.

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Explanation:

if the runner maintains an average speed of 5.5 m/s

we can use the formula

vt = d

hence the answer would be:

5.5 × (30 × 60)

note: we have to convert meter to second which is the SI unit.

answer: 4950 meters

The correct option is B. Decrease the length of the wire between the switch and the battery.

The resistivity of a wire is the measure of the opposition to the flow of current offered by the wire.

ρ = RA/L

RA = ρL

R = ρL/A

where;

Decrease in length of the wire will cause a decrease in the resistance of the wire, and it will increase the current flowing in the wire, causing the bulb to glow brighter.

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Answer:

Height, mass, acceleration.

Explanation:

I hope it helps u dear! ^_^

Answer:

Soil erosion by water occurs when bare-sloped soil surface is exposed to rainfall, and the rainfall intensity exceeds the rate of soil intake, or infiltration rate, leading to soil-surface runoff.

Explanation:

Surface cover and runoff. Surface cover is a major factor to control erosion because it reduces the impact of raindrops falling on bare soils and wind removing soil particles. It also reduces the speed of water flowing over the land. Erosion risk is significantly reduced when there is more than 30% soil cover.

Answer:

by natural process of flood

by blasting of dam

increasing the water level