A real image can be obtained with:
A convex lens and a convex mirror
A concave lens and a concave mirror
A convex lens and a concave mirror
A concave lens and a convex mirror

Answer:

lhf

Explanation:

.

hydrogen

Explanation:

Selenium is an element whose trace amounts are essential for life, as proven in 1979 based on its cumulative function with vitamin E [23]. Increasing deficiency of selenium in different parts of the world leads to the occurrence of many pathological disorders

Answer:

circle

Explanation:

because Earth is not oblong

Explanation:

February according to the urben dictionary

Answer:

This is because the protons have more mass and are harder to get moving. Although electrons are very small, their negative electrical charges are still quite strong. Remember, the negative charge of an electron is the same as the positive electrical charge of the much larger in size proton.~Tori

Explanation:

Answer:

f=force m=mass and a=acceleration

Answer: No , a chemical change has not occured as it was easily reversed.

Explanation:

Chemical change is defined as a change in which rearrangement of atoms take place and leads to formation of new substances. It can only be reversed with the help of a chemical reaction.

Physical change is defined as a change which leads to change in shape, size or state of the substance changes. No new substance is formed.It can be easily reversed.

As the hair colour was washed out and returned to its original brown colour, it was a physical change.

Answer:

Troposphere

High-pressure areas form due to downward motion through the troposphere, the atmospheric layer where weather occurs.

Answer: The initial velocity of the projectile is 3.1 km/s        

Explanation:

There is a problem with the question because we do not know in which direction the projectile travels 70 km.

I will assume that the projectile travels 70 km horizontally, as is the usual case.

I will also assume that 25 seconds after the projectile is fired, it hits the ground.

Suppose that the initial velocity of the projectile is V0, and this velocity V0 can be thought as the hypotenuse of a triangle rectangle, then the x-component and the y-component of the velocity will be the catheti of this triangle rectangle, then we can write:

Vy = V0*sin(25°)

Vx = V0*cos(25°).

Now, the vertical problem does not affect the horizontal one, so we can see only the horizontal case.

Here we don't have any force, then there is no acceleration, then the velocity is constant and it is equal to:

v(t) = V0*cos(25°)

For the horizontal position we can integrate over time to get:

p(t) = V0*cos(25°)*t + p0

where p0 is the initial position, and we can assume that it is equal to zero.

Then:

p(t) = V0*cos(25°)*t

Now we know that in t = 25s, the position is 70km

(because the projectile travelled 70km in 25 seconds) then:

p(25s) = 70km = V0*cos(25°)*25s

Now we can solve this for V0.

V0 = 70km/(cos(25°)*25s) = 3.1 km/s          

The initial velocity of the projectile is 3.1 km/s              

The thing you can get from this is that we can analyze the vertical problem and the horizontal problem separately (for example, here we only solved the horizontal case and we ignored the vertical one).

I don't know to be honest

Explanation:

Explanation:

(a) The gravitational potential energy of the coin above the ground level is given by :

[tex]E=mgh[/tex]

Where

m is mass of the object

g is acceleration

h is height

The kinetic energy of the coin when travelling at a speed v is given by :

[tex]E_k=\dfrac{1}{2}mv^2[/tex]

(b) The coin is dropped from the top of a building of height 380m. Let v the speed of the coin as it hits the ground. Using the conservation of energy.

[tex]v=\sqrt{2gh} \\\\v=\sqrt{2\times 9.8\times 390} \\\\v=87.42\ m/s[/tex]

Hence, this is the required solution.

Answer:

1/4

Explanation:

Mechanical Advantage = Load/Effort

Given

Effort applied = 24N

Load = 6N

Substitute

MA = 6/24

MA = 1/4

Hence the mechanical advantage is 1/4

Answer:

4

Explanation:

24n/6n=4

Answer: 2.5 km

Explanation:

5/2 = 2.5 km

60/2 = 30 mins

Answer:

740.55

Explanation:

845.54 + -104.99

=740.55

Answer:

15m

Explanation:

Hello! first to solve this problem we must find that so much that the tree grew in the 15 years this is achieved by dividing the height of the tree before and after

the tree grew 10 times its initial length in 15 years, so to find how tall the nail is, we multiply this factor by 1.5m

X=(1.5m)(10)=15m

the nail is 15 meters above ground level

Answer:

the rate at which someone or something is able to move or operate.

Explanation:

Speed is a scalar quantity that refers to "how fast an object is moving." Speed can be thought of as the rate at which an object covers distance. A fast-moving object has a high speed and covers a relatively large distance in a short amount of time.

Hope this helps     :)

Answer:

Explanation:

speed of sound in 24 degrees celsius

345.48m/s

hence 345.48m/s x 3s = 1036.44m

Answer:

Shadows are formed when an opaque object or material is placed in the path of rays of light. The opaque material does not let the light pass through it. The light rays that go past the edges of the material make an outline for the shadow

Explanation:

Use physics kinematic equations to solve for t. Lookup physics kinematic problems on Kahn for more understanding.

Answer:(G=6.67×10−11Nm2/kg2)

Explanation:

Answers:

1) A process that occurs when an object or a particle moves, referred to as kinetic energy

2) A potential energy is a stored amount of energy that changes depending on the relative positions.

3) Potential Energy is the energy stored in an object due to its position. Kinetic Energy is the energy of motion in a moving object.

4)

  a) C and B

  b) A

  c) From B to A or from C to A

  d) From A to B or from A to C

[tex]\huge\mathfrak\green{answer}[/tex]

1) Kinetic energy of an object is the measure of the work an object can do by the virtue of its motion.

For Example : A river flowing at a certain speed comprises kinetic energy as water has certain velocity and mass.

2) Potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.

For Example : A child at the top of the slide

3) KINETIC ENERGY

POTENTIAL ENERGY

(make sure to draw a table and write them separately)

4)

a) C and B

b) A

c) B to A then C to A

d) A to B then A to C

(mark me brainliest please I need 1 more :))

[tex]\large\sf\green{thank \: you}[/tex]

Answer: 5184 kJ

Explanation:

Given

Area of cross-section [tex]A=200\ cm^2[/tex]

thickness of slab [tex]t=5\ cm[/tex]

thermal conductivity [tex]k=0.5\ W/m-K[/tex]

temperature difference [tex]\Delta T=150\ K[/tex]

Heat flow is given by

[tex]\Rightarrow Q=kA\dfrac{dT}{dx}\\\Rightarrow Q=0.5\times 200\times \dfrac{150}{5}\times 10^{-2}\\\Rightarrow Q=30\ W\ or\ 30\ J/s[/tex]

for 2 days time period, it is

[tex]t=2\ days\ or\ 2\times 24\times 60\times 60\ s\\t=1,72,800\ s[/tex]

Heat flow in 2 days

[tex]Q=30\times 172800=5184000=5184\ kJ[/tex]

Answer:

red-shifted (shifted toward the red end of the light spectrum)

Explanation:

This is because according to the Doppler effect, objects moving away from Earth get shifted towards the red end of the light spectrum. So, they are red-shifted.

They can travel through matter and through space.

Electromagnetic radiation is one of the many ways that energy travels through space. The heat from a burning fire, the light from the sun, the X-rays used by your doctor, as well as the energy used to cook food in a microwave are all forms of electromagnetic radiation.

While these forms of energy might seem quite different from one another, they are related in that they all exhibit wavelike properties.

The electromagnetic spectrum is a taxonomy of electromagnetic waves that groups them according to their varied wavelengths and frequencies. 

Therefore, They can travel through matter and through space.

To learn more about Electromagnetic waves, refer to the link:

https://brainly.com/question/18165320

#SPJ5

Answer:

The space around a charge or a pole in which a force is experienced is called a magnetic field. And a cluster of aligned magnetic atoms is a magnetic domain. When the clustered regions are aligned with one another, they form a magnet

Answer:

i think it's is 30N

Explanation:

i got it right

Answer:

The nature of volcanic eruptions is highly dependent on magma viscosity and also on dissolved gas content. ... long it takes the treacle to flow from one end of a boiling tube to the other.