Select the correct answer from each drop-down menu.
We can change a gas to liquid by_______ the temperature and______ the pressure

Answer:

A.) the photoelectric effect

Explanation:

Answer:

See the explanation.

Explanation:

Q9. Irregular reflection happens when a set of parallel beams are reflected from non-smooth surface which results in non-parallel reflected beams.

Q10.

i) Periscope

ii) There are different types of periscopes but the main characteristic of this instrument is observation over the obstacles or in general objects that are not in the line-of-sight. Basic Periscope uses parallel angled mirrors to project objects that are above the surface in submarines.

Answer:

A lot of Dietary Fiber.

Explanation:

Answer:

Red apples get their color from anthocyanins. These are pigments, or natural colorings, that develop as the apple grows. ... It absorbs all the colors of the rainbow—except for red. The red light reflects off the apple and our brain and eyes work together to let us know what color we are seeing.

The surface tension acts to hold the surface intact. Capillary action occurs when the adhesion to the surface material is stronger than the cohesive forces between the water molecules. ... Water wants to stick to the glass and surface tension will push the water up, until the force of gravity prevents further rise.

Narrower tube openings allow capillary action to pull water higher

Answer:

2.47 s

Explanation:

Convert the final velocity to m/s.

We have the acceleration of the gazelle, 4.5 m/s².

We can assume the gazelle starts at an initial velocity of 0 m/s in order to determine how much time it requires to reach a final velocity of 11.1111 m/s.

We want to find the time t.

Find the constant acceleration equation that contains all four of these variables.

Substitute the known values into the equation.

The Thompson's gazelle requires a time of 2.47 s to reach a speed of 40 km/h (11.1111 m/s).

Answer:

No

Explanation:

Are the divisions of the electromagnetic spectrum distinct?

The answer is NO.

To explain my answer, there are some points to be noted

1.) There are no clear divisions between the different ranges or bands in the electromagnetic spectrum. The divisions are somewhat arbitrary

2.) The naming of subdivisions is also arbitrary. For instance, microwaves are sometimes regarded as a subdivision of radio waves

3.) The ranges of x-ray and gamma ray overlaps

Answer:

16 kgm/s

Explanation:

Step one:

given data

m1= 2kg

v1= 4 m/s

m2= 1kg

v2= 8m/s

Required

The magnitude of momentum after impact pafter

Momentum is the product of a moving object's mass and velocity

Step two:

Pa= m1v1+m2v2

Pa=2*4+1*8

Pa=8+8

Pa=16 kgm/s

Answer:

5kg

Explanation:

The cart with the least amount of mass will result in the fastest acceleration.

The cart with the fastest acceleration is 5 kg cart because its mass is the smallest.

The given parameters;

According to Newton's second law of motion, the force applied to an object is directly proportional to the product of mass and acceleration of the object.

F = ma

The acceleration of the 5 kg cart is calculated as follows;

[tex]a = \frac{F}{m} \\\\a = \frac{90}{5} = 18 \ m/s^2[/tex]

The acceleration of the 6 kg cart is calculated as follows;

[tex]a = \frac{F}{m} \\\\a = \frac{90}{6} = 15 \ m/s^2[/tex]

The acceleration of the 8 kg cart is calculated as follows;

[tex]a = \frac{F}{m} \\\\a = \frac{90}{8} = 11.25 \ m/s^2[/tex]

The acceleration of the 9 kg cart is calculated as follows;

[tex]a = \frac{F}{m} \\\\a = \frac{90}{9} = 10 \ m/s^2[/tex]

Thus, the cart with the fastest acceleration is 5 kg cart because its mass is the smallest.

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Answer:

The force of friction acting on the block has a magnitude of 15 N and acts opposite to the applied force.

Explanation:

Net Force

The Second Newton's law states that an object acquires acceleration when an unbalanced net force is applied to it.

The acceleration is proportional to the net force and inversely proportional to the mass of the object.

If the object has zero net force, it won't get accelerated and its velocity will remain constant.

The m=2 kg block is being pulled across a horizontal surface by a force of F=15 N and we are told the block moves at a constant velocity. This means the acceleration is zero and therefore the net force is also zero.

Since there is an external force applied to the box, it must have been balanced by the force of friction, thus the force of friction has the same magnitude acting opposite to the applied force.

The force of friction acting on the block has a magnitude of 15 N opposite to the applied force.

Answer:

A wave has a wavelength of 5 meters and a frequency of 3 hertz.

Explanation:

Answer:

150mm

Explanation:

The correct answer to the given question is 150mm or 6 inch.

Atleast 150mm or 6 inches of a free conductor, measured from the point in box where it emerges from its cable sheath or raceway, must be left at each outlet, switch or junction point to lumination or connection of devices.

150mm of free conductor is required for the devices to be connected, this needs to be placed in the junctions

Answer:

C: The electrons in the neutral object transfer onto a positively charged object.

Explanation:

In conduction, when we charge one object with another, both of them will now have the same type of charge. Thus, in conduction, a positive object is used to charge a neutral object, then it means that both objects become charged positively charged. Electrons are positive charges.

Thus electrons in the neutral object are transferred onto a positively charged object and so option C is right.

Explanation:

120+ 120 = 240 miles divided 1 hours 20 seconds

Answer/Explanation:

Phyllite is a very common metamorphic rock, found in many parts of the world. It forms when sedimentary rocks are buried and mildly altered by the heat and directed pressure of regional metamorphism.

Answer:

metamorphic rock

Explanation:

Phyllite is a very common metamorphic rock, found in many parts of the world. It forms when sedimentary rocks are buried and mildly altered by the heat and directed pressure of regional metamorphism.

Answer:

Earth is nearest the Sun in July and farthest away in July.

Explanation:

Answer:

Correct Answer: B.

Explanation:

Earth is nearest the Sun in January and farthest away in July. Explanation: According to Kepler's Second Law, a planet travels fastest when it is nearest its sun. This means that Earth is actually closest to the Sun in January, when it is winter in the northern hemisphere!

Answer:

synapse

Explanation:

The message carried is the nerve impulse, which is transmitted to nearby cells. The space where one neuron can transmit the impulse to another neuron is known as a Synapse.

Neurons, also known as neurons or nerve cells, are the basic building blocks of the nervous system and brain. They are the cells in charge of receiving sensory information from the outside world, trying to send motor commands to with us muscles, and converting and relaying electrical signals at each stage along the way.

However, their interactions also shape what we are as people. However, our about 3 trillion neurons do connect with some other cell types that are generally referred to as glia in a close manner.

Visualizing a cell as a tree is a helpful analogy. Three essential components of a neuron are dendrites, an axon, and a cell body, or soma, that can be compared to the branches, foundations, and core of a tree, correspondingly.

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Answer:

it covers your phone so when you drop it it reduces the chance and breaking

Answer:

P = r g h   where r here is the density m / V and then P is the pressre.

W (weight) = m g

m = 10 N / 9.8 m / s^2 = 1.02 kg

r (density) = m / V = 1.02 kg / 1000 cm^3 = .00102 kg/cm^3

P = .00102 kg / cm3 * 9.8 m/s^2 * 10 cm

P = .1 kg m / (s^2 cm^2)

Since 1  N = kg m / s^2    then P = .1 N / cm^2

More simply P = F / A = 10 N / 100 cm^2 = .1 N / cm^2

Answer:

hello your question is incomplete attached below is the complete question

answer: Fg / Fe does not change ; it is the same nonzero value for all separations ( A )

Explanation:

Given that distance between proton and electron is 1 cm

Fg = Gm1m2 / r^2

where :

G ( gravitational constant )= 6.67 * 10^-11 Nm^2 / kg^2

m1 ( mass of proton ) = 1.67 * 10^-27 kg

m2 ( mass of electron ) = 9.11 * 10^-31 kg

Electrical force

Fe = kq1q2 / r^2

k = 9*10^9

hence ;

Fg / Fe = (Gm1m2 / r^2) / (kq1q2 / r^2 )

            = Gm1m2 / kq1q2

Answer:

the material of the phone case

The purpose of a cell phone cover is to protect your phone from impact forces. It is done by absorbing the impact of force by back cover.

What is Force ?

Force is responsible for the motion of an object. it produces acceleration in the body. According to newton's second law force is mass times acceleration i.e. F =ma. Its SI unit is N which is equivalent to kg.m/s².

The case is made in such a way that, if the cell phone is dropped, the cover will absorb the kinetic energy of the falling phone by the means of deforming without transferring the impact onto the phone.

Cell phone cover is made up of rubber which can restore the forces like a spring. when u apply force to the rubber it get displaced and applied force is stored in the rubber. when cell phone drops, rubber of the cover absorbs the energy of impact. it also provides shied protection to the phone.

Hence this is how cell phone case do this.

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Answer:

it will option C this is the correct answer of this question

Digital data can usually be recovered even if the storage device if it stops working and memory chips don't break easily. So, the correct options are B and D.

Digital storage of data is defined as the process that usually involves saving computer files or documents on magnetic storage devices, usually flash memory which may include hard drives, memory sticks or cards, optical discs , cloud storage, etc. are included.

Reliable storage ensures that which computer files or documents are easily accessible and can be recovered in the event of loss. Digital data can usually be recovered even if the storage device fails, as long as the memory chips are not easily breakable.

So, the correct options are B and D.

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Answer:

a. The magnitude of the resultant velocity vector of the fish is approximately 5.83 m/s

The direction of the resultant velocity vector of the fish is approximately 30.93° relative to the direction of the river

b. The magnitude of the resultant velocity vector of the surfer is approximately 6.083 m/s

The direction of the resultant velocity vector of the surfer is approximately 9.46° relative to the direction of the wave

Explanation:

a. The given parameters of the fish and the river are;

The speed with which the fish is swimming across the river, v₁ = 3.0 m/s

The velocity  with which the river is flowing, v₂ = 5.0 m/s

Therefore, in vector form, we have;

v₁ = 3.0·j

v₂ = 5.0·i

The resultant velocity, R = v₁ + v₂ = 5.0·i + 3.0·j

∴ R = 5.0·i + 3.0·j

The magnitude of the resultant velocity vector, [tex]\left | R \right |[/tex] = √(5.0² + 3.0²) =√34 ≈ 5.83

The magnitude of the resultant velocity vector,  of the fish,  [tex]\left | R \right |[/tex]  ≈ 5.83 m/s

The direction of the resultant velocity of the fish, θ = arctan(3.0/5.0) ≈ 30.93°

Therefore, The direction of the resultant velocity vector of the fish, θ ≈ 30.93° relative to the direction of the river

b. The given parameters of the surfer and the wave are;

The speed with which the surfer is travelling, v₁ = 1.0 m/s

The speed of the wave travelling across, v₂ = 6.0 m/s

Therefore, in vector form, we have;

v₁ = 1.0·j

v₂ = 6.0·i

The resultant velocity, R = v₁ + v₂ = 1.0·i + 6.0·j

∴ R = 1.0·i + 6.0·j

The magnitude of the resultant velocity of the surfer, [tex]\left | R \right |[/tex] = √(1.0² + 6.0²) =√37 ≈ 6.083

The magnitude of the resultant velocity vector of the surfer, [tex]\left | R \right |[/tex]  ≈ 6.083 m/s

The direction of the resultant velocity of the surfer, θ = arctan(1.0/6.0) ≈ 9.46°

Therefore, The direction of the resultant velocity vector of the surfer, θ ≈ 9.46° relative to the direction of the wave

Answer:

a) [tex]W_{Mercury}=92.5 N[/tex]

b) [tex]W_{Mars}=92.8 N[/tex]

c) [tex]W_{Saturn}=261.0 N[/tex]

d) [tex]W_{Pluto}=15.5 N[/tex]

Explanation:

First of all, we need to remember the value of gravity acceleration on each planet.

[tex]g_{Mer}=3.70 m/s^{2}[/tex]

[tex]g_{Mar}=3.71 m/s^{2}[/tex]

[tex]g_{Sat}=10.44 m/s^{2}[/tex]

[tex]g_{Plt}=0.62 m/s^{2}[/tex]

The definition of weigh is the product between the mass and the gravity acceleration, therefore we will have:

a) [tex]W_{Mercury}=25*3.70=92.5 N[/tex]

b) [tex]W_{Mars}=25*3.71=92.8 N[/tex]

c) [tex]W_{Saturn}=25*10.44=261.0 N[/tex]

d) [tex]W_{Pluto}=25*0.62=15.5 N[/tex]

I hope it helps you!

Answer:

Explanation:

A 60W bulb , consumes electrical energy of 60 J per second but it does not give out all the energy in the form of light . Most of the energy consumed by it is wasted in the form of heat . Only a fraction of energy is converted into light energy .

Hence, it is wrong to say that bulb supplies 60 J of light energy each second .

The speed of air greatest in a medium with high pressure. Air is moving from high pressure to low pressure areas called the winds.

The natural movement of air or other gases in relation to a planet's surface is referred to as wind. There are many different sizes of winds, ranging from thunderstorm flows that last only a few minutes to local breezes.

Large-scale atmospheric circulation is primarily brought on by the planet's rotation and the difference in temperature between the equator and the poles (Coriolis effect).

The air can move through a medium as well through vacuum. Air blows with the highest speed when the medium have higher temperature and pressure.

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Answer:

20

27

Explanation:

Given parameters:

Atomic mass  = 47

Atomic number  = 20

Unknown:

Number of protons  = ?

Number of neutrons  = ?

Solution:

To solve this problem,

  Atomic mass  = number of protons + number of neutrons

    Atomic number  = number of protons

So;

   Number of protons  = 20

 Now;

    Number of neutrons  = Atomic mass  - number of protons

     Number of neutrons  = 47  - 20  = 27

Given :

A 1200 kg truck traveling at 20 m/s towards the east.

To Find :

The magnitude and direction of the momentum.

Solution :

We know, momentum is given by :

Momentum, P = mv

P = 1200 × 20 kg m/s

P = 24000 kg m/s

Now, we know, direction of momentum is same as the direction of velocity.

Therefore, momentum of truck is 24000 kg m/s and direction is towards the east.

Answer:

a spectrum in which the dispersion is highly discriminative so that at each point the light is practically monochromatic.

Answer:

E =250 J

Explanation:

Given that,

The spring constant of the spring, k = 500 N/

It is stretched to a distance of 1 m

We need to find how much elastic potential energy does the spring have stored in it.

The energy stored in the spring is called elastic potential energy. It is given by the formula as follows :

[tex]E=\dfrac{1}{2}kx^2\\\\E=\dfrac{1}{2}\times 500\times 1^2\\\\E=250\ J[/tex]

So, 250 J of energy is stored in the spring.