2.
A dolphin can hear sounds with frequencies up to 280 kHz. What is the
speed of sound in water if a wave with this frequency has a wwavelength
of 0.51 cm?

Answer:

2 the molecules will move faster

Explanation:

the heat from the pay gives the molecules now energy causing the to spread out and move faster

Answer:

Please find attached file

Explanation:

The rate of change of velocity with respect to time is known as acceleration. The acceleration of the ball will be 10m/s.

The rate of change of velocity with respect to time is known as acceleration. According to Newton's second law, the eventual effect of all forces applied to a body is its acceleration.

The pace at which a body's velocity varies is represented by acceleration, which is a vector quantity.

The given data in the problem is given by ;

u is the initial speed of ball = 0 m/sec

v is the final speed of the ball= 10 m/sec

t is the time interval= 2 second

a is the acceleration of ball=? m/sec²

The formula for acceleration is;

[tex]\rm a=\frac{(v-u)}{t} \\\\ \rm a=\frac{(20-0)}{2} \\\\\rm a=10\ m/sec^2[/tex]

Hence the acceleration of the ball will be 10m/s².

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Explanation:

The reason time zones are 15 degrees wide is because there are 24 hours and 360/24 = 15. As you move east by 15 degrees the sun’s position in the sky changes relative to us and it looks an hour later in the day, so we advance our clocks to match the sun’s position.

So every 15° eastward one hour ahead.

Answer:

sun is the main source while the other object reflect light on the sun

Explanation:

nasa libro yans

Answer:

Electromagnetic

Explanation:

Electromagnetic waves are those waves that do not require any material medium for propagation. They arise from a vibration of electric and magnetic fields.

The electromagnetic spectrum is comprised of many waves. One of the waves in the spectrum is visible light.

Visible light is in turn composed of seven different wavelengths of which green light is one of them. Hence, green light travels by electromagetic wave.

[tex] \bf \underline{Given :-}[/tex]

[tex] \sf{• \: An  \: electric \:  heater \:  draws  \: a  \: current  \: of  \: 5  \: ampere \:  from \:  220  \: volt \:  supply.}[/tex]

[tex] \\ [/tex]

[tex]\bf{ \underline{To \:  Find:- }}[/tex]

[tex] \sf• \: ( a)  \: lts  \: resistance.[/tex]

[tex] \sf• \: (b) \:  electrical  \: energy  \: consumed  \: in \:  kwh \:  if  \: it  \: is  \: used  \: for \:  4  \: hours.[/tex]

[tex] \\ [/tex]

[tex]\huge\bf{ \underline{ Solution :-}}[/tex]

[tex] { \boxed{\bf{(a)}}}[/tex]

[tex] \sf•  \: Current  \: (I) = 5 \: A[/tex]

[tex] \sf• \: Voltage \: (V) = 220 \: v[/tex]

[tex] \bf \red{\bigstar{\: Formula \:  of \:  Resistance \: (R) =  \frac{V}{I} }}[/tex]

[tex] \sf \rightarrow  R = \frac{220}{5} [/tex]

[tex] \sf \rightarrow R =44[/tex]

[tex] \bf{Hence,  \: it's  \: resistance \:  is  \:  \: 44 \:  Ω \: .}[/tex]

[tex] \\  \\ [/tex]

[tex] { \boxed{\bf{(b)}}}[/tex]

[tex] \sf•  \: Current  \: (I) = 5 \: A[/tex]

[tex] \sf• \: Voltage \: (V) = 220 \: v[/tex]

[tex] \bf \red{\bigstar{\: Formula  \: of \:  Electric  \: Power \:  (P) = IV  }}[/tex]

[tex] \sf \rightarrow P = (5  \times 220) [/tex]

[tex] \sf \rightarrow P = 1100 \:[/tex]

[tex] \\ [/tex]

[tex] \sf \therefore \: P = 1100 \: watt[/tex]

[tex] \sf{• \: Time  \: (t) = 4  \: hours }[/tex]

[tex] \bf \red{\bigstar{ \: Formula  \: of  \: Energy  \: (W) = Pt}}[/tex]

[tex] \sf \rightarrow W= 1100  \times  4[/tex]

[tex] \sf \rightarrow W = 4400[/tex]

[tex] \sf \rightarrow W  =  \frac{4400}{1000} [/tex]

[tex] \sf \rightarrow W  =  4.4[/tex]

[tex] \sf \therefore W  =  4.4 \: kwh[/tex]

[tex] \bf{Hence,  \: Electrical  \: Energy \:  is \:  4.4  \: kwh.}[/tex]

Answer is 4.4 kwh.

hope it helps you.

Answer:

the device that transfer thermal energy into to mechanical energy is heat engine.

hope it helps.

Explanation:

heat engine transforms thermal energy to mechanical energy

hope it is helpful to you

Answer:

Final temperature, T2 = 314.9 Kelvin

Explanation:

Given the following data:

Mass = 0.9kg

Initial temperature, T1 = 10°C to Kelvin = 10 + 273 = 283K

Quantity of heat = 120,000 J

Specific heat capacity = 4182 j/kgK

To find the final temperature;

Heat capacity is given by the formula;

[tex] Q = mcdt[/tex]

Where;

Q represents the heat capacity or quantity of heat.

m represents the mass of an object.

c represents the specific heat capacity of water.

dt represents the change in temperature.

Making dt the subject of formula, we have;

[tex] dt = \frac {Q}{mc} [/tex]

Substituting into the equation, we have;

[tex] dt = \frac {120000}{0.9*4182} [/tex]

[tex] dt = \frac {120000}{3763.8} [/tex]

dt = 31.9K

Now, the final temperature T2 is;

But, dt = T2 - T1

T2 = dt + T1

T2 = 31.9 + 283

T2 = 314.9 Kelvin

Answer:

Carbon monoxide

Explanation:

Carbon refers to the "C" which stands for carbon. Monoxide refers to the single molecule of oxygen present in the substance.

Answer:

Carbon monoxide is the answer here

Explanation:

Answer:

Explanation:

Plug

Answer:

Explanation:

This is a fast plane! At it's takeoff speed, it could fly around the world in 5 seconds!

Acceleration is defined as the change in speed over the change in time.

[tex]a = \frac{v_f - v_o}{t}[/tex]

Where v_f is the final velocity, v_o is the original velocity, and t is the time.

We know v_f = 8820km/s.

v_o = 0 km/s. The plane "starts at rest before it's engine start." So we know it starts from zero velocity.

t = 32.8 seconds.

You can solve the equation from there.

Answer:

1. Endurance activities

Only aerobic source

2. Can contract repeatedly

Speed strength and power.

Both aerobic and anaerobic sources

3. Fast contraction speed

Only anaerobic sources

Produce most force

Fatigue quickly

Speed, strength and power

Explanation:

I hope this helps. Although, I'm about 80% sure of the answer.

Answer:

wavelength

Explanation:

Electromagnetic waves is a propagating medium used in all communications device to transmit data (messages) from the device of the sender to the device of the receiver.

Generally, the most commonly used electromagnetic wave technology in telecommunications is radio waves.

Radio waves can be defined as an electromagnetic wave that has its frequency ranging from 30 GHz to 300 GHz and its wavelength between 1mm and 3000m. Therefore, radio waves are a series of repetitive valleys and peaks that are typically characterized of having the longest wavelength in the electromagnetic spectrum.

Basically, as a result of radio waves having long wavelengths, they are mainly used in long-distance communications such as the carriage and transmission of data.

The distance from one peak to the next peak is called wavelength. This distance is also equal to the distance from one trough of a wave to another.

Mathematically, wavelength is calculated using this formula;

[tex] Wavelength = \frac {speed}{frequency} [/tex]

Answer:

The resultant force is the single force that would produce the same effect on an object as two or more forces that are applied to the object. To find the resultant force, first draw a free body diagram, which is a diagram that shows all the applied forces using arrows in the direction of each force.

Answer:

Objective lens is the answer

Answer:

Evaporation of water

Explanation:

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ur answer is

Evaporation of water.

Answer:

 V = 2.52 10³ V

Explanation:

The electric potential for a point charge is

       V = k ∑ [tex]\frac{q_i}{r_i}[/tex]

In this case the formula is

       V = k ([tex]\frac{q_1}{r_1} + \frac{q_2}{r_2}[/tex])

distances are the absolute value

       r₁ =√ (7.1 -0)² = 7.1 m

       r₁ =√ (7.1 - 14.3)² = 7.2 m

we substitute

       V = 9 10⁹ (q₁ / 7.1 + q₂ / 7.2)

we have two possibilities

* different charges

         V = 9 10⁹ (q₁ / 7.1 + q₂ / 7.2)

* equal charges and same sign

          q₁ = q₂ = q

         V = 9 10⁹ q (1 / 7.1 + 1 / 7.2) = p 9 10⁹   0.2797

         V = 2.52 10⁹ q

if we assume a value of the charge, for example q = 1 10⁻⁶ c

           V = 2.52 10⁹ 1 10⁻⁶

            V = 2.52 10³ V

Answer:

Flappers are symbols of the Thundering Twenties, the social, political disturbance and expanded transoceanic social trade that followed the finish of World War I. Flappers were viewed as reckless for wearing inordinate cosmetics, drinking liquor, smoking cigarettes in broad daylight, driving vehicles and treating sex nonchalantly. They guaranteed that the flappers' dresses were 'close to exposure', 'nervy', 'foolish', and unintelligent.

Answer:

A. Crust

B. Mantle

C. Outer Core

D. Inner Core

Explanation:

Answer:

A. Crust

B. mantle

C. outer core

D. inner core

Explanation:

because it is

battery

Explanation:

Electromagnets can be created by wrapping a wire around an iron nail and running current through the wire. The electric field in the wire coil creates a magnetic field around the nail. In some cases, the nail will remain magnetised even when removed from within the wire coil

Answer:

Light Bulb

Explanation:

I did the quiz and i got it right

Answer:

C. Sources of electrical current!

Hope this helps :)

Answer:

Sources of electrical current

Explanation:

Got it right on the test.

Answer:

Both have the same amount. C.

Explanation:

Answer: The chemical name for N2O3 is dinitrogen trioxide.

Explanation:

Nitrogen occurs chiefly as a free element in the air, making up about 78% by volume of the atmosphere. Nitrogen forms several oxides with oxygen. The formation of these oxides by the direct combination of nitrogen and oxygen required very high temperatures. Examples of oxides of Nitrogen includes:

--> Nitrogen (I) oxide: N20

--> Nitrogen (II) oxide: NO

--> Dinitrogen trioxide: N2O3.

When naming a chemical compound the number of elements in the compound is put under consideration using prefixes such as di (2), Tri(3), tetra(4), penta(5). From the chemical formula N2O3, there are 2 nitrogen atoms and with +3 oxidation state. Hence, the name DINITROGEN TRIOXIDE.

The chemical name of N₂O₃ is dinitrogen trioxide. The correct option is (b).

Two nitrogen atoms and three oxygen atoms make up the chemical molecule known as dinitrogen trioxide (N₂O₃). It is nitrogen oxide. Depending on the circumstances, dinitrogen trioxide exists as either a dark blue solid or a blue liquid.

Dinitrogen trioxide is an unstable and highly reactive substance. Nitric oxide (NO) and nitrogen dioxide (NO₂) gases are easily formed from it:

2 N₂O₃ → 2 NO₂ + O₂

Dinitrogen trioxide undergoes exothermic, or heat-producing, breakdown.

The prefixes "di-" and "tri-" denote the presence of two and three oxygen atoms, respectively, in the molecule. Therefore, dinitrogen trioxide is the name given to the substance N₂O₃.

Hence, the chemical name of N₂O₃ is dinitrogen trioxide. The correct option is (b).

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An object at rest stays at rest and an object in motion stays in motion at a constant speed and direction unless acted upon by an unbalanced force. ... In the absence of any forces, no force is required to keep an object moving.

In everyday situations, it does seem that a force is needed to keep an object moving at a constant speed in a straight line because the resistive frictional force acted on every objects against their motion.

The resistance provided by surfaces in touch as they move past one another is known as friction.

According to Newton's first law of motion, Unless forced to change its condition by an outside force, every object will continue to be at rest or moving uniformly in a straight line.

But in  everyday situations, it does seem that a force is needed to keep an object, for example the shopping trolley, moving at a constant speed in a straight line because of the frictional resistive force acting opposite to the motion. That's why, a force of equal magnitude and opposite direction must be applied on the object, so that, resultant force becomes zero. It can at a constant speed in a straight line.

Learn more about friction here:

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