Giving brainliest!! if you answer correctly :) (30pts)

Answer:

C

Explanation:

A constant force of 1.25N

Explanation:

This is a kinematics problem.

First find acceleration,

then use F = ma to find force.

Given:

mass = .5kg

delta x = 20m

t = 4s

a = ?

Friction = 0

From the kinematics equations:

delta x = Vi + (1/2)at^2

Plug in terms that are given:

20m = 0 + (1/2)a(4^2)

(2*20m)/(16s^2) = a

40m/(16s^2)= 2.5m/s^2

Now use F = ma to find force exerted on object.

F = (0.5kg)*(2.5m/s^2)

F = 1.25N

Answer:

satellite B

Explanation:

A .F= G (mM)/r²

B .F= G (2mM)/r² = 2G (Mm)r²

C .F= G (3mM)/(2r)² = ¾G (mM)/r²

D .F= G (4mM)/(2r)² = G (mM)/r²

Answer:

The work done will be "43,200 J".

Explanation:

The given values are:

Force,

F = 720 N

Distance,

S = 60 m

Time,

t = 30 sec

As we know,

⇒  [tex]Work \ done=Force\times Distance[/tex]

On substituting the values, we get

⇒                     [tex]=720\times 60[/tex]

⇒                     [tex]=43,200 \ J[/tex]

Answer:

The answer is Polarization

Answer:

It is b

Explanation:

Answer: 1.79 kW

Explanation:

Given

The temperature of the refrigerator is [tex]T_L=2^{\circ}C\approx 275\ K[/tex]

The temperature of the kitchen is [tex]T_H=22^{\circ}C[/tex]

COP of the refrigerator is

[tex]COP=\dfrac{T_L}{T_H-T_L}=\dfrac{\text{Desired effect}}{\text{Power}}\\\\\Rightarrow COP=\dfrac{275}{22-2}=\dfrac{89}{P}\\\\\Rightarrow P=\dfrac{20}{275}\times 89=6.47\ MJ/h\ \text{or}\ 1.79\ kW[/tex]

Answer:

510 meters

Explanation:

That is sort of a math question but with the meters and wavelength, it's both a physical and a math question. Don't worry, i won't report (Unless you report my answer)

The surface of Mercury looks much like Earth's moon. ... On its dark side, Mercury gets very cold because it has almost no atmosphere to hold in heat and keep the surface warm. The temperature can drop down to minus 300 degrees Fahrenheit. Sunlight never reaches into the bottoms of some craters near Mercury's poles.

Answer: B

Because Mercury is the closest planet to the sun

Explanation:

Hope this helps

Answer:

d = 4.44 m

Explanation:

Given that,

The moment of force on a door = 10 N-m

The applied force, F = 2.25 N

We need to find the distance of the handle. The moment of force is given by :

[tex]\tau=F\times r[/tex]

Where

r is the distance of the handle.

[tex]r=\dfrac{\tau}{F}\\\\r=\dfrac{10}{2.25}\\\\r=4.44\ m[/tex]

So, the required distance is equal to 4.44 m.

Answer

0.510

Explanation:

Answer:37000

Explanation:

37 x 1000= 37000

Answer:

1. It will never run out

2. It’s better for the eviroment

Explanation:

1. Coal is not a renewable source and take along time for it to form so it will soon run out

2. Burning coal releases fossil fums into the air affecting the ozone layer but using solar power dose not release anything into the air

Answer:

Renewable energy works as clean sources of energy, and don't make as much of a detrimental impact on the environment as non-renewable energy. Air pollutants are a product of some non-renewable sources, and it negatively affects the atmosphere, humans, animals, and oceans.

Also, renewable sources won't run out, unlike other sources, as they are finite and will not last forever.

I hope this helped!

Explanation:

the inability to change the position from rest to motion or motion to rest by themselves is inertia.

Answer:

Inertia is the property of a body in rest to resist motion or a body in motion to continue to its state of motion unless acted by external forces.

Answer:

c. convection currents in the asthenosphere

Explanation:

Una reacción química, también llamada cambio químico o fenómeno químico, es todo proceso termodinámico en el cual dos o más especies químicas o sustancias (llamadas reactantes o reactivos), se transforman, cambiando su estructura molecular y sus enlaces, en otras sustancias llamadas productos.

Answer: A chemical reaction, also called chemical change or chemical phenomenon, is any thermodynamic process in which two or more chemical species or substances (called reactants or reactants), are transformed, changing their molecular structure and their bonds, into other substances called products.

Explanation:

Answer:

C. for sure

Explanation:

usatestprep

Answer:

101201.2 Pascal.

Explanation:

Given that the difference h between the two liquid levels is 2.0 cm. The density of the liquid is 800 kg /m3.

Calculate the difference between the pressure of the gas and atmospheric

pressure.

The pressure of the gas can be calculated by using the formula

Pressure = density × acceleration due to gravity × height

Substitute all the parameters into the formula

Pressure = 800 × 2/100 × 9.8

Note that the height is converted to metre.

Pressure = 156.8 Pascal

pressure difference = 101358 - 156.8

Pressure difference = 101201.2 Pascal

Answer:

117.43 m

Explanation:

Eg=mgh=13x9.81xh=127.53h(N)

Ek=0.5mv^2=0.5(13)(48)^2=14,976 N

by conservation of potenial energy:

Ei=Ef

127.53h=14976

h=117.43m

Answer:

KE+PE

Explanation:

Explanation:

point c is minimum Amplitude in transversal wave

Answer:

Sexual

Explanation:

Sexual reproduction takes more energy and time. Since you know it requires two people of opposite sexes to "do it".

Answer:

Electrical

Explanation:

Electrical would be the energy that involves the flow of positive charges.