What are the three sources of heat (energy) on earth?

Answer:

Explanation:

5x + y = 7

20x - y = -2

    25x = 5

        x = (1/5)

5(1/5) + y = 7

1 + y = 7 .

y = 6

system of equations  5x+y=7, 20x+2=y

is  [tex]x=\frac{1}{5} \\y=6[/tex]

Therefore,

Calculation

[tex]5x+y=7.............(i)\\20x+2=y..........(ii)[/tex]

adding equations (i) and (ii)

⇒[tex]5x+y=7-(20x-y=-2)[/tex]

⇒[tex]25x=5[/tex]

⇒[tex]x=\frac{1}{5}[/tex]

putting the value of x in equation (i), we get

⇒[tex]5[/tex]×[tex]\frac{1}{5}+y=7[/tex]

⇒[tex]y=7-1[/tex]

⇒[tex]y=6[/tex]

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Answer:

Violet, blue, green, yellow, orange, red

Explanation:

I just took the astronomy quiz, I got it right

Answer:

Nuclear fission creates heat!!

Explanation:

Reactors use uranium for nuclear fuel. The uranium is processed into small ceramic pellets and stacked together into sealed metal tubes called fuel rods. Typically more than 200 of these rods are bundled together to form a fuel assembly!

P.S. You can search this up!

- Hope this helped you!! :D

Answer:

(a) ω = 1.57 rad/s

(b) ac = 4.92 m/s²

(c) μs = 0.5

Explanation:

(a)

The angular speed of the merry go-round can be found as follows:

ω = 2πf

where,

ω = angular speed = ?

f = frequency = 0.25 rev/s

Therefore,

ω = (2π)(0.25 rev/s)

ω = 1.57 rad/s

(b)

The centripetal acceleration can be found as:

ac = v²/R

but,

v = Rω

Therefore,

ac = (Rω)²/R

ac = Rω²

therefore,

ac = (2 m)(1.57 rad/s)²

ac = 4.92 m/s²

(c)

In order to avoid slipping the centripetal force must not exceed the frictional force between shoes and floor:

Centripetal Force = Frictional Force

m*ac = μs*R = μs*W

m*ac = μs*mg

ac = μs*g

μs = ac/g

μs = (4.92 m/s²)/(9.8 m/s²)

μs = 0.5

Answer:

750 J

Explanation:

lets convert mass into kg first , 150 /1000 = 0.15 kg

kinetic energy =  [tex]\frac{mv^{2} }{2}[/tex] =  [tex]\frac{0.15*100^{2} }{2} = 750 J[/tex]

The kinetic energy will be 750 J for an object mass of 150 grams and the object moving at a velocity of 100 m/s.

A moving item or particle might have power of a certain type called kinetic energy. When work, which entails the transfer of energy, is done on an object by applying a net force, that object acquires kinetic energy. The kinetic energy of a moving object or particle is a function of its mass and velocity of motion. Vibration, rotation around an axis, translation (or moving along a path from one place to another), or any combination of these might be considered motion.

According to the question, the given values are :

Mass, m = 150 gram or,

m = 150 /1000 = 0.15 kg and,

Velocity, v = 100 m/s.

As we know that the kinetic Energy = 1/2 mv²

K.E = 1/2 (0.15)(100)²

K.E = 1/2 (1500)

K.E = 750 J.

Hence, the kinetic energy will be 750 J.

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Answer:

Total displacement 155 m

Explanation:

From the question, the formula to apply will be that of cosine rule where:

[tex]c=\sqrt{a^2+b^2-2ab*cosC}[/tex]

where

a= 43 m , b=130m and c =? , <C=28° + 90° =118°

Substituting values in the equation as;

[tex]c=\sqrt{43^2+130^2-2*43*130*cos118}[/tex]

[tex]c=\sqrt{1849+16900-11180*-0.46947} \\\\c=\sqrt{1849+16900+5249} \\\\c=\sqrt{23998} \\\\\\c=155m[/tex]

Answer: the answer is 108 N

Just took the test and got 108 N correct

Answer:

Explanation:

speed is define as rate of change of distance or displacement

v=s/t

s=8 m

t=4s

v=8/4

v=2 m/s

Resistors & Notations In Series In Parallel

A, B A + B A | B

A, B, C, D A+B+C+D A | B | C | D

In Combination Example A | B | ( C + D ) A | B | ( C + D )

Dec 1 2020

Answer: An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space.

Explanation: The parts of a circut bit can easily be found online, but heres a pic i found.

Answer:

is about something failing down

it is a water

Explanation:

it falls after the clouds are full from either evaporation or transportation in the water cycle but do not drink it, it is very dirty and bad for you

Answer:

14m/s

Explanation:

Given parameters:

Radius of the curve  = 50m

Centripetal acceleration  = 3.92m/s²

Unknown:

Speed needed to keep the car on the curve = ?

Solution:

The centripetal acceleration is the inwardly directly acceleration needed to keep a body along a curved path.

 It is given as;

      a = [tex]\frac{v^{2} }{r}[/tex]  

a is the centripetal acceleration

v is the speed

r is the radius

  Now insert the parameters and find v;

         v²   = ar

        v² = 3.92 x 50  = 196

         v  = √196 = 14m/s

The speed that is necessary for keeping the car on the curve is 14 m/s.

Given that,

Based on the above information, the calculation is as follows:

We know that

[tex]a = v^2 \div r[/tex]

Here a denotes the centripetal acceleration.

v denotes the speed.

And, r denotes the radius.

So,

[tex]v^2 = ar\\\\= \sqrt(3.92 \times 50)\\\\= \sqrt{196}[/tex]

= 14 m/s

Therefore we can conclude that the speed that is necessary for keeping the car on the curve is 14 m/s.

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Answer:

what do you need helo with

Answer:

Ek = 1705.28 [J]

Explanation:

In order to solve this problem, we must remember that kinetic energy can be calculated by means of the following equation.

[tex]E_{k}=\frac{1}{2} *m*v^{2}[/tex]

where:

m = mass [kg]

v = velocity [m/s]

Ek = kinetic energy [J] (Units of Joules)

For the person running

[tex]E_{k} =\frac{1}{2}*52.2*(3.5)^{2} \\ E_{k} =319.72[J][/tex]

For the bullet

[tex]E_{k} =\frac{1}{2} *m*v^{2}[/tex]

[tex]E_{k} =\frac{1}{2} *0.02*(450)^{2} \\E_{k}=2025 [J][/tex]

The difference in Kinetic energy is equal to:

Ek = 2025 - 319.72

Ek = 1705.28 [J]

Answer: 1703.44

Explanation: trust

Answer:

1.75 is the unit rate so yeah

Answer:

Explanation:

The mass of the object can be found by using the formula

[tex]m = \frac{f}{a} \\ [/tex]

f is the force

a is the acceleration

From the question we have

[tex]m = \frac{6}{12} = \frac{1}{2} \\ [/tex]

We have the final answer as

Hope this helps you

m = f/a

6 / 12 = 0.5

answer - 0.5

Answer:

20 kg

Explanation:

Mass equals force divided by acceleration, so divide 100 N by 5 m/s2 and you get your mass: 20 kg

Answer: m= 20 kg

Explanation: Use the formula

F = m a

to solve this.

100 N = m (5 m/s²)

100 N / (5 m/s²) = m

20 kg = m

(N is also kgm/s², so when you divide by m/s², you are left with kg.)

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 69 × 2

We have the final answer as

Hope this helps you

Answer:

solid to gas or gas to liquid

Explanation:

welcome

Answer:

solid to gas or gas to liquid

Explanation:

Edge

Answer:

B .

Explanation:

Elastic potential energy stored in a spring is given by;

E=1/2*k*{Δl}²  where

k= spring constant

Δl = change is length of spring

if k is different the energy stored in the system is different. This is true also in the case where Δl is different.

For a parallel system, springs help each other to carry the weight. The stiffness doubles up to mean ;

k parallel =2k

and

Δl parallel = 1/2 Δl

so;

E in one spring = 1/2*k*{Δl}²----------{a}

Using {a} this in the parallel system;

E parallel = 1/2 * 2k * {1/2Δl}²

                = 1/2 * 2* k* 1/4 *{Δl}²

                = 1/2 E in one spring

Answer : Ep / 2

Explanation:

fossil and glaciers is the to pieces of evidence

Answer:

An object is moving across a surface, but it does not gain or lose speed, the object's net force is zero.

Explanation: The net force means the vector sum of all the forces acting on an object

Answer:

well its not C

Explanation:

Answer:

C. the production of new machines as a result of processes using science and knowledge.

Explanation:

Technology is the application of scientific research and knowledge .

Answer:

Ionic Bond

Explanation:

Answer:

An ionic bond

Answer:

aceleration doubles

Explanation:

From Newton's secon law, one has

F=m*a

where F is the force, m the mass and a the aceleration.

In general, if m becomes m/2, in order to have the same force,

the acceleration must be doubled:

[tex]F=m*a=\frac{m}{2} (2*a)[/tex]

In our particular case,

[tex]12=6*a=\frac{6}{2} (2*a)\\12=3(2*a)[/tex]

Answer:

245W

Explanation:

Given parameters:

Mass of his body = 50kg

Height of climb  = 5m

Time  = 10s

Unknown:

Power = ?

Solution:

Power is defined as the rate at which work is done;

 Mathematically,

           Power  = [tex]\frac{work done}{time}[/tex]

  Work done  = mgh

m is the mass

g is the acceleration due to gravity

h is the height

  Work done  = 50 x 9.8 x 5  = 2450J

          Power  = [tex]\frac{2450}{10}[/tex]   = 245W

Answer: dum dum

Explanat

Answer:

13482m÷2

Explanation:

1498m÷s×9=13482m÷s

The depth of the ocean if the ultrasonic pulses produced are received after 9 seconds will be equal to, 6741 m.

Sound is a mechanical disruption from an equilibrium position that travels through an elastic medium of material.

It is also possible to define sound solely subjectively, as that which is regarded by the ear, but this definition lacks clarity and is overly constrictive because it is useful to talk about sounds that are manufactured by devices other than the human ear, such as dog whistles and sonar machinery, which cannot do hear by human ear.

The features of sound waves must be examined first in any study of sound. Transverse and longitudinal waves are indeed the two fundamental forms of waves, and they vary by the direction in which they move.

As per the given information in the question,

Let the depth is d.

Total distance the pulse has to travel = 2d

Time taken, t = 9 sec

Speed of sound, V = 1498 m/s

Velocity =  Distance/time taken

V = 2d/9

d = 1498 × 4.5

d = 6741 m.

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