what is compressibility?

Answer:

carbon isnt 12

Explanation:

The author of this passage is focusing on both the merits and demerits of electromagnetic waves. Thus, he agree with the statement  that electromagnetic radiation can be both helpful and harmful to humans.

Electromagnetic waves are transformation of energy and they are travelling with a combined electric field and magnetic field. There are various kinds of electromagnetic waves namely, ultraviolet, radio waves, microwaves x-rays etc.

All these waves have significant applications in various fields. Mostly in medical fields. They are used for diagnosing, cancer treatments drug optimization etc.

However, these waves are highly energetic and harmful too. Direct and elongated exposure to these waves may cause severe health risks including cancer.

The author addresses the advantages and disadvantages of the electromagnetic waves. Thus, option B is correct.

To find more on electromagnetic waves, refer here:

https://brainly.com/question/3101711

#SPJ2

Answer:

A? Cause is needs the Velocity more than the Heading.

Answer:

2.4 J

Explanation:

The total kinetic energy of the solid sphere = rotational kinetic energy + translational kinetic energy

KE(total) = KE(rot) + KE(trans)

KE(rot) = KE(total) - KE(trans)

Since its total kinetic energy KE' = 8.4 J and its mass, m = 3 kg and the velocity of its center of mass, v = 2m/s, KE(trans) = 1/2mv² = 1/2 × 3 kg × (2 m/s)² = 3 kg × 2 m²/s² = 6 kgm²/s² = 6 J

So, KE(rot) = KE(total) - KE(trans)

Substituting the values of the variables, we have

KE(rot) = 8.4 J - 6 J

KE(rot) = 2.4 J

So, the rotational kinetic energy of the solid sphere is 2.4 J

The rotational kinetic energy of the solid sphere will be "2.4 J".

According to the question,

Total Kinetic energy, KE' = 8.4 J

Mass, m  = 3 kg

Center of mass's velocity, v = 2 m/s

Now,

KE(trans) = [tex]\frac{1}{2}[/tex]mv²

By substituting the values,

               = [tex]\frac{1}{2}[/tex]  × 3 × (2)²

               = [tex]\frac{1}{2}[/tex] × 3 × 4

               = 6 kgm³/s² or,

               = 6 J  

We know the relation,

→ KE(rot) = KE(total) - KE(trans)

By putting the values,

              = 8.4 - 6

              = 2.4 J

Thus the approach above is correct.  

Find out more information about kinetic energy here:

https://brainly.com/question/25959744

Answer:

b

Explanation:

bcuz I looked it up and it was on there

Answer:

the answers are:

- cool fluid sinks

- warm fluid rises

- convention current

Explanation:

Im late but mark me as brainliest for helping you out cause the one on top is clueless

Answer:

True

Explanation:

Answer:

What heat means in thermodynamics, and how we can calculate heat using the heat ... Scientists define heat as thermal energy transferred between two systems

Explanation:

thermal energy

Answer:

1. 638.144j

2. 319.072 j

3. 957.216 j

Explanation:

M = 11.8 kg cylinder

V = speed of center of gravity = 10.4m/s

A.

Translational kinetic energy

= 1/2mv²

1/2x 11.8kg x 10.4²

= 11.8x108.16/2

= 1276.288/2

= 638.144 J

This is the translational energy

B.

Rotational energy

1/2Iw²

I = mv²/2

w = v/r

When we substitute

1/2[mv²/2][v/r]²

= 1/4mv²

= 1/4 x 11.8 x 10.4²

= 1276.288/4

= 319.072

This is the rotational energy

C

Total kinetic energy.

We add the values of A and B above to get this.

638.144 J + 319.072 J

= 957.216J

Answer:

the pressure is: 200 N/m^2

Explanation:

Recall that pressure is defined as force (F) per unit of area (A), which in math terms is:

P = F / A

Then, if the force is 2.4 N , and the area of the glass' bottom is 0.012 m^2, then the pressure is:

P = 2.4 / 0.012 = 200 N/m^2

Answer:PLEASE HELP ME

Explanation:

Answer:

K = 567.91 J

Explanation:

Given that,

Mass of sphere, m = 18 kg

Radius of a sphere, r = 0.8 m

It makes one complete revolution every 0.4 s.

The speed of center of mass of the sphere is 8 m/s

We need to find the rotational kinetic energy of the sphere. It is given by the formula as follows :

[tex]K=\dfrac{1}{2}I\omega^2[/tex]

I is moment of inertia,

[tex]I=\dfrac{2}{5}mr^2\\\\I=\dfrac{2}{5}\times 18\times (0.8)^2\\\\I=4.608\ kg-m^2[/tex]

[tex]\omega[/tex] is angular speed

[tex]\omega=\dfrac{2\pi }{0.4}\\\\=15.7\ rad/s[/tex]

So,

[tex]K=\dfrac{1}{2}\times 4.608\times (15.7)^2\\\\K=567.91\ J[/tex]

So, the rotational kinetic energy of the sphere is 567.91 J.

The rotational kinetic energy of the sphere is 710.8 J.

I = ¹/₂mr²

I = 0.5 x 18 x (0.8)²

I = 5.76 kgm²

ω = 2πf

ω = 2π x (1/0.4s)

ω = 15.71 rad/s

K.E = ¹/₂Iω²

K.E = 0.5 x (5.76) x (15.71)²

K.E = 710.8 J

Thus, the rotational kinetic energy of the sphere is 710.8 J.

Learn more about rotational kinetic energy here: https://brainly.com/question/25803184

Answer:Bar magnets are permanent magnets as opposed to electromagnets

Answer: 5000J

Explanation:

equation for kinetic energy is k=(mv^2)/2

plug in your mass and velocity

k = (2000*5^2)/2 = 5000J

The velocity at which an object is sent moving and the mass of the object both play a hand in the level of kinetic energy that object produces. Mass and kinetic energy have a positive relationship, which means that as mass increases, kinetic energy increases, if all other factors are held constant.

Answer:

U

Explanation:

Answer:

Explanation:

The Electric field due to an infinite plane of positive charge with uniform surface charge density can be derived a s follows

let us assume An infinite positively charged sheet and lets take a cylindrical gaussian surface on this surface which is perpendicular to this plane of sheet

we know that positive charge electric field lines will be perpendicular to this sheet surface will be perpendicular to the cylindrical surface

applying gauss law

[tex]Electric field * Area =[/tex] [tex]charge/epsilon\\[/tex]

also sigma=Q/A ⇒ Q=sigma*A

so on one face

E*A=sigma*A/epsilon

also we notice this electric field on one face of the sheet is exactly equal to that on the another face hence electric field will be twice

2E*A=sigma*A/epsilon

final result

[tex]E= sigma/2*epsilon[/tex]

Answer:

The time required is t = 9.39 [s]

Explanation:

To solve this problem we must use the following equation of kinematics.

[tex]v_{f}=v_{o} +(a*t)[/tex]

where:

Vf = final velocity = 77 [m/s]

Vo = initial velocity = 0

a = acceleration = 8.2 [m/s²]

t = time [s]

The initial speed is zero, since the airplane begins its movement from rest. The initial speed is zero, since the aircraft begins its movement from rest. Another important fact is that the sign of acceleration is positive since the plane is accelerating, that is, its speed is increasing.

Now replacing:

77 = 0 + (8.2*t)

t = 9.39 [s]

Answer:

u = 0.334 m/s

Explanation:

The formula for Reynold's number is given as follows:

Re = ρuL/μ

where,

Re = Reynold's Number = 2511

ρ = Density of air = 1.25 kg/m³

μ = Dynamic Viscosity of Air = 1.83 x 10⁻⁵ Pa.s

L = Characteristic Length = Diameter of Sphere = 11 cm = 0.11 m

u = Speed = ?

Therefore,

2511 = (1.25 kg/m³)(u)(0.11 m)/(1.83 x 10⁻⁵ Pa.s)

u = (2511)/(7513.66 s/m)

u = 0.334 m/s

Answer:

-62.02πrads/sec^2

Explanation:

A centrifuge in a medical laboratory rotates at an angular speed of 3,550 rev/min. When switched off, it rotates through 52.0 revolutions before coming to rest. Find the constant angular acceleration (in rad/s2) of the centrifuge.

We need to convert to SI unit

9.549rev/ min= 1rad/sec

Then to convert angular speed of 3,550 rev/min to rad/sec

( 1 rad/sec)/9.549rev/min = x/5600rev/min

Then

(3,550 rev/min)/(9.549rev/min)= 371.77rad/sec

=118.4πrad/sec

6.823rad= 1rev

52.0 revolutions = 52×6.823= 354.796rads

= 113πrads

We will use expresion below to calculate our angular acceleration

w^2 - w^2(0)= 2α¢

Where w= angular speed

w(0)= initial angular

If final angular speed= 0

α=-w^2(0)/2¢

α=(-118.4π)^2/(2×113)

=-14018.56/226

-62.02πrads/sec^2

Answer:

What is the answer we are supposed to be finding?

Explanation: Your answer is 980.7 if you are converting kilograms to Newtons

Complete Question

Find the terminal velocity of a spherical bacterium (diameter [tex]2.00 \mu m[/tex] ) falling in water. You will first need to note that the drag force is equal to the weight at terminal velocity. Take the density of the bacterium to be [tex]1.10 *10^{3} \ kg/m^3[/tex]

Answer:

The value is [tex]v_t = 2.38*10^{-6} \ m/s[/tex]

Explanation:

From the question we are told that

   The diameter of the  spherical bacterium is [tex]d = 2.0\mu m = 2.0 *10^{-6} \ m[/tex]

     The density of the bacterium is  [tex]\rho =1.10 *10^{3} \ kg/m^3[/tex]

Generally the radius is mathematically represented as

       [tex]r = \frac{d}{2}[/tex]

=>   [tex]r = \frac{2.0 *10^{-6}}{2}[/tex]

=>   [tex]r = 1.0*10^{-6}[/tex]

Generally the volume is mathematically represented as

     [tex]V = \frac{4}{3} * \pi * r^2[/tex]

=>[tex]V = \frac{4}{3} * 3.142 * (1.0*10^{-6})^3[/tex]

=>[tex]V = 4.189 *10^{-18} \ m^3[/tex]

Generally the mass is mathematically represented as

     [tex]m = V * \rho[/tex]

=>  [tex]m = 4.189 *10^{-12} * 1.10 *10^{3}[/tex]

=>  [tex]m = 4.608 *10^{-15} \ kg[/tex]

Generally the terminal velocity is mathematically represented as

     [tex]v_t = \frac{m * g}{ 6\pi * r * \eta}[/tex]

Here  [tex]\eta[/tex] is the viscosity of water with value  [tex]\eta = 1.005 *10^{-3} \ kg/m\cdot s[/tex]

So

     [tex]v_t = \frac{4.608 *10^{-15} * 9.8}{ 6 * 3.142 *1.0*10^{-6} * 1.005 *10^{-3}}[/tex]

=>  [tex]v_t = 2.38*10^{-6} \ m/s[/tex]

Answer:

How many electrons whill each element gain or lose in forming an ion? ... to form an ionic compound? a. Al and O b. H and N c. I and K d. F and Cl e. Li and S ... free flowing, but the valence electrons in ionic crystals have a strong bond with their atoms ... necessary to attain the electron configuration of what kind of element

Explanation:

Answer:

Explanation:

Dipole moment of a coil carrying current i with area A

M = i A , M is magnetic moment , i is current and A is area of the coil.

A = π R²

= 3.14 x ( 3470 x 10³ )²

= 3.78 x 10¹³  m²

8.00 x 10²² = 3.78 x 10¹³ x i

current i = 8.00 x 10²²  / 3.78 x 10¹³

= 2.11 x 10⁹ A .

Answer:

A liquid mixture of hydrocarbons that is present in certain rock strata and can be extracted and refined to produce fuels including gasoline, kerosen, diesal oil. :)

Explanation:

Yea mark brainleist pls

Answer:

2.31m/s² downwards

Explanation:

The sum of forces on the object is expressed as;

T-W

T is the tension on the rope

W is the weight

According yo Newton's second law:

T-W= ma

m is the mass

a is the acceleration

Given

T = 75N

W = mg = 10×9.81

W = 98.1N

Substitute

75-98.1 = 10a

-23.1 = 10a

a = -23.1/10

a = -2.31m/s²

The magnitude of the acceleration is 2.31m/s² and directions is downwards

Given that,

Mass of a firefighter, m = 94 kg

Frictional force, F = 750 N

Speed at the bottom of the pole is 3.1 m/s

It is required to find the distance he slide down the pole.

Using Work-energy theorem,

initial potential energy = final kinetic energy + work done

[tex]mgh=W+\dfrac{1}{2}mv^2[/tex]

[tex]mgh=Fh+\dfrac{1}{2}mv^2[/tex]

Solving for h, such that :

[tex]h(mg-F)=\dfrac{1}{2}mv^2\\\\h=\dfrac{1}{2(mg-F)}mv^2\\\\h=\dfrac{1}{2(94(9.8)-750)}\times 94\times (3.1)^2\\\\h=2.63\ m[/tex]

So, he will slide 2.63 m down the pole.

Answer:

Different ions are deflected by the magnetic field by different amounts. The amount of deflection depends on: the mass of the ion. Lighter ions are deflected more than heavier ones.

Explanation:

It mainly flows blood to arteries of heart but the answer is true.. because it also exchange oxygen,nutrient etc..

Answer:

1) The outer planets happened to have been on the far side of the sun, so the shortest route passes the inner planets

Explanation:

All the planets revolve around the sun in a circular orbital. The orbits of Mercury, Venus, Earth, and Mars are tightly held with sun as they are very close to the sun and revolve faster in comparison to outer planet Jupiter, Saturn, Uranus, and Neptune.

Because of the shortest distance between the sun and inner planets, the spacecraft is able to visit the inner planet more than once while outer planets are very far from the sun and revolve around a large orbit, so the spacecraft visited the outer planets less than the inner planet.

Hence, the correct answer is "1".