. Let us say that you put a cup of cold water in one room and a cup of hot water in
another room. Both rooms are at room-temperature. Why does the cold water get
warmer and the hot water get cooler?

Answer:

I think it's in a series

Explanation:

is this an aviation class

Answer: F=kq1q2/r2

"F" is the resulting force between the two charges. The distance between the two charges is "r." The "r" actually stands for "radius of separation" but you just need to know it is a distance. The "q1" and "q2" are values for the amount of charge in each of the particles.

Explanation:

The mathematical equation for the electric force between two charges will be ,[tex]\rm F = \frac{K q_1q_2}{r^2}[/tex]. It is a type of attractive force.

The electric force between the two charges is directly proportional to the product of the charge and inversely proportional to the square of the distance between them.

The electric force is found as;

[tex]\rm F = \frac{K q_1q_2}{r^2}[/tex]

q₁ is the magnitude of charge 1

q₂ is the magnitude of charge 2

k is the proportionality constant

r is the separated distance

F is the electric force

Hence, the mathematical equation for the electric force between two charges will be ,[tex]\rm F = \frac{K q_1q_2}{r^2}[/tex]

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Answer:

I think it's how far out the water goes from the beach before the tsunami because before tsunami usually the water goes back way behind the tide before tsunami and that tells them everything they need I think

Answer:

1 m

Explanation:

The following data were obtained from the question:

Frequency (f) = 300 MHz

Velocity (v) = 3×10⁸ m/s

Wavelength (λ) =?

Next, we shall convert 300 MHz to Hz. This can be obtained as follow:

1 MHz = 10⁶ Hz

Therefore,

300 MHz = 300 MHz × 10⁶ Hz / 1 MHz

300 MHz = 3×10⁸ Hz

Thus, 300 MHz is equivalent to 3×10⁸ Hz.

Finally, we shall determine the wavelength of the as follow:

Frequency (f) = 3×10⁸ MHz

Velocity (v) = 3×10⁸ m/s

Wavelength (λ) =?

v = λf

3×10⁸ = λ × 3×10⁸

Divide both side by 3×10⁸

λ = 3×10⁸ / 3×10⁸

λ = 1 m

Therefore, the wavelength is 1 m

Answer:

[tex]a=\frac{v^2}{r}[/tex]

[tex]v=\sqrt{a*r}[/tex]

[tex]r=\frac{v^2}{a}[/tex]

Explanation:

This is the formula for centripetal acceleration in terms of the tangential velocity (v) and the radius of the circular motion (r).  The expression for the acceleration is already given, so simply type it as shown:

[tex]a=\frac{v^2}{r}[/tex]

For the velocity (v) multiply by "r" both sides and then use the square root to solve for v:

[tex]a*r=v^2\\v=\sqrt{a*r}[/tex]

For the radius multiply both sides by r and then divide both sides by the acceleration (a) in order to isolate r completely:

[tex]a*r=v^2\\r=\frac{v^2}{a}[/tex]

Answer:

b

Explanation:

Answer:

C. a ball at the top of a mountain

Explanation:

It has more potential energy because it is the highest from the ground. The higher it is, the more potential energy it has.

Answer:

chris gets 960 and molly gets 1440

Explanation:

add the ratio up and divide

2+3=5

2400/5=480

480x2=960

480x3=1440

960+1440= 2400

Answer:

Dual Energy X-Ray Absorptiometry (DEXA) is used to measure body composition.  

Explanation:

As a standard method for body composition analysis, DEXA has high accuracy along with hydrodensitometry. Its advantage is that it can measure the body composition of bone density, body fat and muscle mass for different parts.

Answer:

it can kill you cell and win you kill you no cell no life

Explanation:

Answer:

Our bodies are designed to deal with the low levels we're exposed to everyday due to evolution. But, too much radiation can damage tissues by changing cell structure and damaging DNA.  

Explanation:

This can cause serious health problems, including cancer.

Answer: a b c or d

Explanation

Answer:

D

Explanation:

Waves with long wavelength and low  energy are used more in medical field. High energy waves are hazardous to cells. Hence, option B is correct.

Electromagnetic waves are waves that can pass through vacuum as well as through a medium. They are associated with an electric field and magnetic field.

The electromagnetic waves which are longer in wavelength are radio waves, microwaves and IR. They have low frequency and lower in energy. Short wavelength high energy waves are UV, x-rays and gamma rays.

In medical field long wavelength waves are more used to treat disease  such as cancer. Radio waves are used to treat cancer. High frequency, high energy waves are more used in diagnostic purposes. Such as in x-rays, detection of cancer cells etc.

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Answer:

100Ns

Explanation:

find velocity and then plug into momentum formula momentum=(velocity)(mass)

Answer:

5,000 kg-m/s going south

Explanation:

Since you're only given mass and height, not velocity. You have to find velocity first. The equation for velocity is v=2gh. We know gravity is 10 since it's given & height is also given which is 125m. After doing the math, it's 2,500. Now that you have velocity, you can plug velocity into the formula for momentum which is p=mv. 2.0 times 2,500 = 5,000 kg-m/s going south.

A. Doctors can safely monitor the physical demands of detox

A. Doctors can safely monitor the physical demands of detoxB. Doctors can provide accountability and emotional support

A. Doctors can safely monitor the physical demands of detoxB. Doctors can provide accountability and emotional supportC. Doctors can prescribe drugs to counteract the effects of alcohol

A. Doctors can safely monitor the physical demands of detoxB. Doctors can provide accountability and emotional supportC. Doctors can prescribe drugs to counteract the effects of alcoholD. Doctors can help shorten the time needed for detox and rehab

Answer:

True

Explanation:

Modulation waves(schemes) can be analog or digital. An analog modulation scheme has an input wave that varies continuously like a sine wave.

Answer:

I assume that the force of 2N is applied along the direction of motion and was applied for the whole 1 meter, the formula of work is this; Work = force * distance * cosθ where θ is zero degrees. Plugging in the data to the formula;

Explanation:

Work = 2N * 1m * cos 0º.

Work = 2N * 1m * 1

Work = 2Nm

Work = 2 joules

The basic reason is that before 2007 their were not enough energy in the liquid methane molecules to break the bond between them after 2007 the energy of the molecules increases which breaks the bond and the liquid methane changes phase.

It had been summer since 2002, but the lake didn’t evaporate until  2007.

The molecular attraction between methane molecules is stronger the amount of energy absorbed by liquid methane was not enough to break the inter molecular forces until 2007.

After 2007, the sun had transferred enough energy so that the kinetic energy of the methane molecules increased enough to overcome the attraction between them.

The liquid methane evaporated and the molecules started moving away from each other.

Thus the liquid methane starts to change phase after 2007 by getting enough energy from the sun.

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Answer:

less surface area the heels have the toe area and the thin heel as the flat shoe has the entire bottom.

Explanation:

Answer:

precipitation and tempurature

Explanation:

i just took the quiz

Answer:

B.precipitation

C.temperature

Explanation:

hope this helps! :D

Answer:

The mass of the boulder remains constant, while its weight decreases with respect to the value of gravitational force on the moon.

Explanation:

The mass of the boulder = 15 kg

On the earth, its mass remains 15 kg. But its weight is;

weight = m x g

           = 15 x 9.8

           = 147 N

The boulder's weight on the earth is 147 N.

When transferred to the moon, the mass remains constant i.e 15 kg. But its weight decreases due to a change in the value of acceleration due to gravity on the moon. Thus, the boulder becomes lighter in weight.

Answer:

Acceleration = 1.25 m/s²

Explanation:

Net force can be defined as the vector sum of all the forces acting on a body or an object i.e the sum of all forces acting simultaneously on a body or an object.

Given the following data;

Force applied = 25 N

Mass = 60kg

The net force acting on the box = 25 + 25 + 25 = 75N

To find the acceleration;

Net force = mass * acceleration

Substituting into the equation, we have;

75 = 60 * acceleration

Acceleration = 75/60

Acceleration = 1.25 m/s²

At 30 degrees C, when 90 grams of NaNO3 is dissolved in 100  grams of water, the solution becomes UNSATURATED.

A saturated solution is a solution that doesn't completely dissolve the solute.

An unsaturated solution is a solution that has a lesser amount of solute than the saturated solution in which it is being dissolved. Thus, the solute will be completely dissolved in the solution at the end of the reaction process.

From the given information:

Since the mass of the solute is lesser than the solvent. It implies that the solute will dissolve completely in the solvent.

Therefore, the solution becomes unsaturated.

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Answer:

Yes, gravitational force is everywhere. Even if you don't move or move, or wherever you are, there is gravitational force.

This question involves the concepts of the time period, orbital radius, and gravitational constant.  

The distance of Hailey's comet above the Earth's Surface is "3.19 x 10⁴ km".

The theoretical time period of the comet around the earth can be found using the following formula:

[tex]\frac{T^2}{R^3}=\frac{4\pi^2}{GM}[/tex]

where,

T = Time Period of Satellite = 75 years[tex](\frac{365\ days}{1\ year})(\frac{24\ h}{1\ day})(\frac{3600\ s}{1\ h})[/tex] = 2.36 x 10⁹ s

R = Orbital Radius = ?

G = Gravitational Constant = 6.67 x 10⁻¹¹ N.m²/kg²

M = Mass of Earth = 5.97 x 10²⁴ kg

Therefore,

[tex]\frac{(2.36\ x\ 10^9\ s)^2}{R^3}= \frac{4\pi^2}{(6.67\ x\ 10{-11}\ N.m^2/kg^2)(5.97\ x\ 10^{24}\ kg)}\\\\R=\sqrt[3]{\frac{(6.67\ x\ 10{-11}\ N.m^2/kg^2)(5.97\ x\ 10^{24}\ kg)(2.36\ x\ 10^9\ s)^2}{4\pi^2}}[/tex]

R = 3.83 x 10⁷ m = 3.83 x 10⁴ km

Now, this orbital radius is the sum of the radius of the earth (r) and the distance of comet above earth's (h) surface:

R = r + h

3.83 x 10⁴ km = 0.64 x 10⁴ km + h

h = 3.83 x 10⁴ km - 0.64 x 10⁴ km

h = 3.19 x 10⁴ km = 31900 km

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The attached picture shows the derivation of the formula for orbital speed.