Select all the correct answers.
Which three statements about electromagnetic radiation are true?
0
Light is a kind of electromagnetic radiation.
0
Electromagnetic radiation can travel only short distances.
O
Electromagnetic radiation has no mass.
O
Electromagnetic radiation can travel through a vacuum.
All kinds of electromagnetic radiation are invisible.​

Answer:

It depends on the frequency and amplitude of the wave itself. Or a more simple way would be if you have a diagram or a picture take a ruler and measure in cm to get the wavelength. Hope this helped!

Explanation:

Answer:

The detailed calculations are shown below;

Explanation:

a)The maximum acceleration of the particle:

  It is seen that the maximum change in velocity is at the time between 8s to 10s.

              Maximum acceleration: [tex]\frac{V}{t}[/tex]

                                                    = [tex]\frac{20}{2}[/tex]

                                                    = 10 m/[tex]s^{2}[/tex]

b) The deceleration of the particle

          The velocity of particle is decreased after 10s so,

                     deceleration = - [tex]\frac{40}{6}[/tex]

                                           = - 6.67 m/[tex]s^{2}[/tex]

c)The total distance traveled by the particle = Area under the curve

                               = [tex]\frac{1}{2}[/tex]* 4*20 + 4*20 +  [tex]\frac{1}{2}[/tex]* 2*20+ 2*20+ [tex]\frac{1}{2}[/tex]* 40*16

                                                       = 290 m

d)The average velocity of the particle = [tex]\frac{Area under the curve}{Total time}[/tex]

                                                               = [tex]\frac{290}{16}[/tex]

                                                               = 18.12 m/s

369 kg

Explanation:

Step 1:

We know that the expression for potential energy is

PE = mgh

where, m =Mass

            g = Acceleration due to gravity

            h Height

Step 2:

Here m = ?

         PE = 108486

         h = 30 m

          g = 9.8 ms⁻²

108486 = [tex]30 * 9.86 * m[/tex]

[tex]m= 108486 / (9.8*30) = 369 kg[/tex]

A paper clip is an example of a magnetic material that can be temporarily magnetized by rubbing it with a permanent magnet, causing it to attract other ferromagnetic objects like another paper clip.

A paper clip is an example of a magnetic material. Magnetic materials are materials that can be magnetized and are attracted to magnets. Some commonly known magnetic materials include iron, nickel, and cobalt. In this case, the paper clip can be attracted to a magnet because it contains iron, which is a magnetic material.

A paper clip is an example of a magnetic material. When you rub a permanent magnet along a paper clip, the paper clip becomes temporarily magnetized due to the alignment of the magnetic domains within the material. This temporary magnetization allows the paper clip to exhibit magnetic properties, such as attracting other ferromagnetic objects. If you place this magnetized paper clip near another paper clip, the untouched paper clip will experience an attractive force, as seen in classroom experiments. Ferromagnetic materials like iron, which paper clips are commonly made of, can be magnetized and therefore are strongly attracted to magnets, unlike insulators or temporary electromagnets that require a current to become magnetized.

Answer:

80km/h

Explanation:

Average speed = distance/time

Given

Distance = 240km

Time = 3 hours

speed = 240km/3hrs

= 80km/h

Answer:

The correct answer is D!

Explanation:

I got it wrong when I put C.

The flame will allow the water to evaporate and be collected in its pure form, leaving the salt component behind. This is known as distillation. Hence, option (D) is correct.

A separation process called distillation is used to remove the solvent-containing liquid from a combination and retain the liquid portion. Boiling the solution and then cooling it causes the vapor to condense back into a liquid during distillation.

We can distil salt water to get pure water that is safe to drink. To accomplish this, take the following actions:

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Answer: 64.91 m/s

Explanation:

This situation is related to free fall, since we are told the piece of glass "dropped".

Now, since this can be considered a one-dimension problem, we can use the following equation:

[tex]V^{2}=V_{o}^{2}+2gd[/tex]

Where:

[tex]V[/tex] is the final velocity of the glass

[tex]V_{o}=0 m/s[/tex] is the initial velocity of the glass

[tex]g=9.8 m/s^{2}[/tex] is the acceleration due gravity

[tex]d=215 m[/tex] is the distance from where the glass fell

Isolating [tex]V[/tex]:

[tex]V=\sqrt{V_{o}^{2}+2gd}[/tex]

[tex]V=\sqrt{2(9.8 m/s^{2})(215 m)}[/tex]

[tex]V=64.91 m/s[/tex] This is the final velocity of the glass

The amount of heat needed to melt 35 g of ice will be equal to 2,800 calories and in kilojoule is 11.7152 KJ.

Heat is energy that is transmitted from one object to another when temperatures are varied. When two bodies of various temperatures are brought together, energy is exchanged, or heat flows, from the hotter body to the colder. The result of this transfer of energy is typically, but not always, a warming of the colder body and a reduction in the temperature of the hotter body.

By migrating from one physical state (or phase) to the other, such as melting from a solid to a liquid, sublimation from the solid to a vapor, boiling from a fluid to a vapor, or shifting through one solid form to the other, a substance can absorb heat while increasing in temperature.

The latent heat of ice = 80cal/g.

So, the amount of heat required

= 35× 80cal

= 2,800 cal. Or,

2800 × 0.004184 = 11.7152 KJ.

Therefore, the amount of heat needed to melt the ice is 11.7152 KJ.

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Answer:

The planet will experience a force of [tex]1.72*10^{23}N[/tex]

Explanation:

The force of gravity [tex]F[/tex] experienced by the planet is of mass [tex]m[/tex] at a distance [tex]R[/tex] from a star of mass [tex]M[/tex] is given by

[tex]F = G\dfrac{mM}{R^2},[/tex]

where [tex]G= 6.7*10^{-11}Nm^2 /kg^2[/tex] is the gravitational constant.

The mass of the star is two times that of the sun:

[tex]M = 2*M_{sun} = 2*(2* 10^{30}kg) = 4*10^{30}kg[/tex],

the mass [tex]m[/tex] of the planet is

[tex]m = 5.4*10^{27}kg[/tex],

the distance [tex]R[/tex] of the planet form the star is

[tex]R =2.897*10^9km = 2.897*10^{12} m[/tex];

therefore, the force of gravity on the planet will be

[tex]F = (6.7*10^{-11})\dfrac{(5.4*10^{27}kg)(4*10^{30}kg)}{(2.897*10^{12}m)^2}[/tex]

[tex]\boxed{F = 1.72*10^{23}N }[/tex]

which is the force that the planet will experience.

Answer:Plant Cells have big Vacouls whereas Animal cell have small Vacouls. Plant Cell have cell wall and cell membranes but animal cell has got cell membranes only. Plants cell has Chloroplast and whereas in animal cell it's absent. Plastids absent in animal cell and present in plant cell.

Explanation:

Yes, Kinetic Energy is a scalar quantity because the direction is not needed.  A scalar quantity is one dimensional measurement.

Explanation:

The kinetic energy is a scalar quantity as it requires only magnitude for description.

Explanation:

Scalar quantity refers to the quantity that has a single dimension. It is not dependent on the direction and has magnitude only, like Temperature and Mass.

Kinetic energy is possessed when the object is set in motion. Any object whether it is moving straight or spinning possess kinetic energy. It depends on two variables, namely, mass and velocity or speed of the object.

Kinetic Energy:  K.E. = [tex]\frac{1}{2}[/tex] × m × v²

The metric unit to measure Kinetic energy is Joule (J).  

Answer:

[tex]u = 2.5 \ m/s[/tex]

Explanation:

Given data:

Height, [tex]h = 210 \ m[/tex]

Time, [tex]t = 6.3 \ s[/tex]

Let the initial velocity of the object be u.

From the kinematic equation,

[tex]h = ut + \frac{1}{2}gt^{2}[/tex]

[tex]210 = u \times 6.3 + 0.5 \times 9.80 \times (6.3)^{2}[/tex]

[tex]\Rightarrow \ u = 2.46 \ m/s[/tex]

[tex]u = 2.5 \ m/s[/tex] (rounding to tenth place)

Final answer:

The object's initial velocity was calculated to be 62 m/s after falling 210 m in 6.3 s.

Explanation:

The initial velocity of the object can be calculated using the formula:

v = u + gt

where:

v is the final velocity (0 m/s as the object stops), u is the initial velocity, g is the acceleration due to gravity (-9.8 m/s²), and t is the time taken (6.3 s).

Plugging in the values:

0 = u - 9.8*6.3

u = 9.8*6.3

u = 61.74 m/s

Rounded to the correct significant digits:

u = 62 m/s

Answer:

      [tex]\large\boxed{\large\boxed{70.6\º}}[/tex]

Explanation:

1. Calculate the scalar product using the coordinates

   [tex]A\cdot B=(3.0\hat i-4.0\hat j+0\hat k)\cdot (-2.0\hat i+0\hat j+3.0\hat k)\\\\A\cdot B=(3)(-2)+(-4)(0)+(0)(3)=-6[/tex]

2. Write the scalar product using the cosine of the angle

     [tex]A\cdot B=|A|\cdot |B|\cdot cos\theta[/tex]

                    [tex]|A|=\sqrt{(3.0)^2+(-4.0)^2}=\sqrt{9.0+16.}=5.0[/tex]

                     [tex]|B|=\sqrt{(-2.0)^2+(3.0)^2}=\sqrt{4.0+9.0}=\sqrt{13.0}[/tex]

3. Equal the two scalar products and solve for cos(θ)

           [tex]-6.0=(5.0)(\sqrt{13.0})cos\theta\\\\cos\theta=0.3328\\\\\theta = arccos(0.3328)=70.6\º[/tex]

The power of a machine depend on two factors are work and time.

Option C

Explanation:

In science, power defined as the amount of work done in a unit time. i.e. delivering work in a rate of time or energy supply, expressed in input of work or transmitted energy divided by the time interval (t) or W/t.

Example: Some work can be done in the long run with a low-power engine or in a short time with a motor with high performance. The equation for power can be given as

              [tex]Power\ (in\ watts) =\frac{\text { work (joules) }}{\text { time (seconds) }}[/tex]

              [tex]P=\frac{W}{t}[/tex]

Answer:

Kinetic energy will increase from 0 J to 12 J and the potential energy will decrease from 12 J to 0 J.

Explanation:

-As the bob swings downwards it loses height. So its gravitational potential energy (GPE) decreases.

-The subsequent work done on the pendulum by the gravitational force increases its kinetic energy.

-At all points, by Law of Conservation of Mechanical Energy, during the swing the total ptential energy  plus kinetic energy is constant.

Answer:

Explanation:

give that person brainlist

Answer:

3.2m

Explanation:

Given parameters:

Frequency of the FM radio = 9.23 x 10⁷Hz

Velocity of the waves = 3  x 10⁸m/s

Unknown:

Wavelength of the wave = ?

Solution:

To solve for the wavelength of the wave, we need the velocity equation;

       Velocity = frequency x wavelength.

Radio waves are all electromagnetic radiations produced by both electrical and magnetic fields perpendicularly oriented to one another.

 Since the unknown is wavelength, we solve for it:

    3  x 10⁸  = 9.23 x 10⁷ x wavelength

          wavelength = [tex]\frac{ 3 x 10^{8} }{9.23 x 10^{7} }[/tex]

        wavelength = 3.2m

Answer:

3.25

Explanation:

on edge :)

Answer:

The answer is B

Explanation:

I just took it on USATESTPREP

Filtration is the best method to separate sand from water because sand is insoluble, filter paper can trap sand particles, and crystallization does not collect water.

The best method to separate sand from water in this scenario is Filtration. Filtration is a process that uses a porous material, such as filter paper, to separate solid particles from a liquid. This method is effective because:

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Answer:

Net force needed to accelerate the skier is 136 N

Explanation:

As per Newton's 2nd law we know that net force on the system is product of mass and its acceleration

here we know that

m = 34 kg

[tex]a = 4 m/s^2[/tex]

so we have

F = ma

[tex]F = 34 \times 4[/tex]

[tex]F = 136 N[/tex]

Answer:

Yes, dimensionally the equation is correct.

Explanation:

This equation is the kinematic equation for uniformly accelerated motion, then we study the units of each member to conclude whether it is dimensionally correct.

vi = initial velocity [m/s]

a = acceleration [m/s^2]

t = time [s]

v = final velocity

therefore we have:

[m/s] + [m/s^2]*[t^2], the second term now is m/s

[m/s]  + [m/s] = [m/s]

So the analysis is correct.

Answer:

same force, but in the opposite direction

Explanation:

As we know that the electrostatic force between two charges is given by Coulomb's law of electrostatics

It is given by

[tex]F = \frac{kq_1q_2}{r^2}[/tex]

so here we can say that the initial force between the given charges is

[tex]F = \frac{(9\times 10^9)(3\mu C)(-5\mu C)}{(0.002)^2}[/tex]

nowwe replace the charge  -5 uC to another charge which is + 5 uC

so here new force will be

[tex]F = \frac{(9\times 10^9)(3\mu C)(5\mu C)}{(0.002)^2}[/tex]

now from above equation we can say that magnitude of the force will be same only the nature of the force will change as initially two opposite charges were there so they will attract each other while in new position there are two similar charges so they will repel each other

so correct answer will be

same force, but in the opposite direction

Answer:

A. same force, but in the opposite direction

Explanation:

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Answer:

Battery will run for t = 90 s

Explanation:

As we know that rate of flow of charge is known as electric current

So we will have

[tex]i = \frac{Q}{t}[/tex]

[tex]i = 0.11 A[/tex]

[tex]Q = 10 C[/tex]

now we have

[tex]t = \frac{Q}{i}[/tex]

[tex]t = \frac{10}{0.11}[/tex]

[tex]t = 90 s[/tex]

Final answer:

A flashlight that draws 0.11 amps can run for about 90.91 seconds on a battery with 10 coulombs of charge.

Explanation:

To calculate how long a flashlight can run with a given amount of charge, we use the relationship between current, charge, and time. Current (I) is the rate of flow of charge over time (Q), represented by the formula I = Q/t, where t is the time in seconds. Given the flashlight draws 0.11 amps (A) and the battery has a charge of 10 coulombs (C), we can rearrange the formula to solve for time: t = Q/I. Therefore, t = 10 C / 0.11 A, which equals approximately 90.91 seconds. Therefore, the flashlight can run for about 90.91 seconds on a battery with 10 coulombs of charge.

Gravity acts more strongly on the object.

Explanation:

When an object is dropped from a height, it reaches the ground despite friction acting on it because the force of gravity acting on it is stronger than the air resistance and friction. Air resistance and friction acts upward and prevents the ball from falling. However, it is negligible. The gravity acting on the object is so strong that it pulls the object towards earth with a constant acceleration called as acceleration due to gravity which has a constant value of 9.8m/s².

Answer:

The air resistance on the skydiver is 68.6 N

Explanation:

When the skydiver is falling down, there are two forces acting on him:

- The force of gravity, of magnitude [tex]mg[/tex], in the downward direction (where m is the mass of the skydiver and g is the acceleration due to gravity)

- The air resistance, [tex]R[/tex], in the upward direction

So the net force on the skydiver is:

[tex]F=mg-R[/tex]

where

m = 7.0 kg is the mass

[tex]g=9.8 m/s^2[/tex]

According to Newton's second law of motion, the net force on a body is equal to the product between its mass and its acceleration (a):

[tex]F=ma[/tex]

In this problem, however, the skydiver is moving with constant velocity, so his acceleration is zero:

[tex]a=0[/tex]

Therefore the net force is zero:

[tex]F=0[/tex]

And so, we have:

[tex]mg-R=0[/tex]

And so we can find the magnitude of the air resistance, which is equal to the force of gravity:

[tex]R=mg=(7.0)(9.8)=68.6 N[/tex]

Answer:

1.50 h

Explanation:

For an object moving in uniform motion (= moving at  cosntant velocity), the relationship between speed, distance and time is given by:

[tex]v=\frac{d}{t}[/tex]

where:

v is the speed of the object

d is the distance covered

t is the time taken to cover the distance

For this problem, we have:

d = 18 miles is the distance covered by David

[tex]v=12 mi/h[/tex] is David's speed

Therefore by re-arranging the equation, we can find the time taken by David to cover that distance:

[tex]t=\frac{d}{v}=\frac{18}{12}=1.5 h[/tex]

Answer:

Seismic waves cause Earthquakes by shaking the ground aggressively and dangerously. These waves are usually calculated on a seismograph to calculate how hard the earthquake hit that area. A transform Boundary creates the tension when the tectonic plates gets stuck. It stays stuck for a long period of time. Then, at one point, the tectonic plates become unstuck which releases the tension into waves which are called seismic waves. Hope I answered you question.

Sound waves don't cause earthquakes.

When parts of the Earth shake and quake and rub against each other, THAT's an earthquake.

THEN, whenever anything is shaking, THAT makes sound waves.

Answer:

B for Edgunity

Explanation:

Answer:

Diffraction of sound wavelengths.

Explanation:

[tex]Diffraction[/tex]-A wave is able to bend around a corner due to the effects of diffraction. sound aves are capable of bending around corners in the same magnitude as it's wavelength making it possible to hear sounds around corners.

Answer:

Explanation:

Heat transfer by conduction only happens by direct contact of the molecules or atoms of a substance: in a solid, particles cannot travel but only vibrate; the heat conduction happens because the vibration of a particle causes adjacent particles to vibrate.

Also, in that system heat transfer by convection would not happen, since convection requires that the particles travel to transfer the heat.

Only heat transfer by radiation can happen when there are no particles, since infrared radiation travels through the empty space.

Answer:117.6joules

Explanation:

Mass(m)=2kg

Height(h)=6m

Acceleration due to gravity(g)=9.8m/s^2

Potential energy(PE)=?

PE=m x g x h

PE=2 x 9.8 x 6

PE=117.6joules

Answer:

The atomic number is the number of protons in an atom's nucleus.

The atomic number is important, because it determines which element an atom is.

Answer:

Explanation:

It is the number of protons in the nucleus which determines all the characteristics of the atom and its place on the periodic table