calculate the pressure exerted by a mercury column of 76 cm high at its bottom.Given that density of mercury is 13600kg/m^3 and g=9.8​

Answer:

light is an example of a wave that is not mechanical .

it is different as it does not need material medium for its propagation

Answer:

A thermometer is an instrument that measures temperature.

Explanation:

It can measure the temperature of a solid such as food, a liquid such as water, or a gas such as air.

Answer:  b)Gases

Explanation: Because the Particle are moving freely

Answer:

Junior Member. A 60 lb weight is located 3 feet from the fulcrum of a lever.

Explanation:

Answer:

Voltage V = 117.65 volts

the voltage across the light bulb's filament is 117.65 V

Explanation:

The power of a light bulb can be expressed with respect to voltage and current flow.

Power = voltage × current

P = VI

Making Voltage V the subject of formula;

V = P/I

Given;

Power P = 4.0W

Current I = 0.034A

Substituting the given values;

V = 4/0.034

V = 117.65 volts

Answer:

It will be B

Explanation:

Answer:The answer is B

Explanation:

For 787 dreamliner airplane,

Mass, [tex]m_1=2450\ kg[/tex]

Height, [tex]h_1=11500\ m[/tex]

Potential energy of 787 dreamliner airplane is given by :

[tex]E_1=m_1gh_1\\\\E_1=2450\times 9.8\times 11500\\\\E_1=2.76\times 10^8\ J[/tex]

For a boeing 747,

Mass, [tex]m_2=3150\ kg[/tex]

Height, [tex]h_2=9000 \ m[/tex]

:

Potential energy of a boeing 747 airplane is given by

[tex]E_2=m_2gh_2\\\\E_2=3150\times 9.8\times 9000\\\\E_2=2.77\times 10^8\ J[/tex]

So, the potential energy of a boeing 747 airplane is more than the 787 dreamliner airplane.

Answer:

Explanation:I don't say you must have to mark my ans as brainliest but if you think it has really helped u plz don't forget to thank me....

Answer:

A wire,rubber

Explanation:

yes

Answer:

Water is a conductor,

An Eraser is an insulator.

Explanation:

Water contains charged ions and impurities that make it a very good conductor of electricity.

The properties of rubber (eraser) causes the electrons to slow down and eventually prevent them from moving at all. Keeping electricity bound within the material is the main goal of an insulator.

Answer:

-10.8°, or 10.8° below the +x axis

Explanation:

The x component of the resultant vector is:

x = 3.14 cos(30.0°) + 2.71 cos(-60.0°)

x = 4.07

The y component of the resultant vector is:

y = 3.14 sin(30.0°) + 2.71 sin(-60.0°)

y = -0.777

Therefore, the angle between the resultant vector and the +x axis is:

θ = atan(y / x)

θ = atan(-0.777 / 4.07)

θ = -10.8°

The angle is -10.8°, or 10.8° below the +x axis.

Answer:

P1 = 85×2.6=221kgm/s

P2= 65×3=195kgm/s

so first person had more momentum

Answer:

See Below

Explanation:

1: Thermal  Energy

2: Chemical Energy

3: Nuclear Energy

4: Electrical Energy

5: Radiant Energy

6: Light Energy

7: Motion Energy

8: Sound Energy

There are 8 types are energy that are above.

Hope this helps.

Answer: There are seven main stores of energy: magnetic

internal (thermal)

chemical

kinetic

electrostatic

elastic potential

gravitational potential

Explanation: So you can have any of these

Answer:

a

Explanation:

i took the test

Five workers from the same factory developed angiosarcoma, a rare cancer of the veins and arteries. This is observation of the scientific method.

Since at least the 17th century, the scientific method—an empirical approach to learning—has guided the advancement of science. Since one's interpretation of the observation may be distorted by cognitive presumptions, it requires careful observation and the application of severe skepticism regarding what is observed.

It entails developing hypotheses through induction based on these observations, testing the validity of those hypotheses through experimental and measurement-based statistical testing of the inferences made from them, and then fine-tuning (or discarding) those hypotheses in light of the experimental results.

These are the guiding principles of the scientific process, as opposed to a predetermined set of steps that apply to all scientific endeavors.

Learn more about  scientific method here:

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Answer:

in everyday use and in kinematic the speed of an object is the magnitude of the change of its position it is thus a scalar quantity

Answer:

483.6 centimeters³

Explanation:

Taking into account the definition of density, 1 pound of butter occupies 482.54 cm³.

First of all, you have to know that density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

[tex]density=\frac{mass}{volume}[/tex]

In this case, you know:

Replacing in the definition of density:

[tex]0.94\frac{grams}{cm^{3} } =\frac{453.592 grams}{volume}[/tex]

Solving:

volume× 0.94 [tex]\frac{grams}{cm^{3} }[/tex]= 453.592 grams

[tex]volume =\frac{453.592 grams}{0.94\frac{grams}{cm^{3} }}[/tex]

volume= 482.54 cm³

Finally, 1 pound of butter occupies 482.54 cm³.

Learn more about density:

Explanation:

Draw a free body diagram.  There are three forces on the block:

Weight force mg pulling down,

Buoyancy force B pushing up,

Tension force T pushing up.

Sum of the forces in the y direction:

∑F = ma

B + T − mg = 0

T = mg − B

Buoyancy is the weight of the displaced fluid:

T = mg − ρVg

The block is fully submerged, so the volume of displaced fluid equals the volume of the block.  The volume of the block is its mass divided by its density.

T = mg − ρ (m/ρₓ) g

T = mg (1 − ρ/ρₓ)

Plug in values and solve.

T = (0.5 kg) (10 m/s²) (1 − (1000 kg/m³) / (8000 kg/m³))

T = (5 N) (1 − ⅛)

T = 4.375 N

Science does not  work when every one does the same thing, some creative thinking will be major breakthroughs for an invention. Therefore, option B is correct.

So how do researchers come up with those particular questions to look into ! It may come as a shock to learn how much imagination is required for the procedure.

Peter Medawar, a Nobel Prize-winning biologist, once described scientific inquiry as "the art of the soluble"  In order to succeed in science, one must first identify the questions that may be answered by scientific study and then determine the answers to those questions, according to Medawar.

Because of how intricate the natural world is, it is frequently impossible to directly address the really intriguing, significant scientific topics

The art of science includes repeatedly re-imagining these complex issues, mentally dividing them into more manageable components, and then guessing as to which of these more manageable components might hold the answer to solving the larger issue.

Therefore, all the discoveries and inventions are resulted from the creative ideas and thoughts of scientists. Therefore, creativity is the only way to make a controlled experiment.

Find more on scientific questions:

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Answer:

pplications of Pascal’s Law  

Hydraulic Lift: The image you saw at the beginning of this article is a simple line diagram of a hydraulic lift. This is...

The construction is such that a narrow cylinder (in this case A) is connected to a wider cylinder (in this case B). They...

Pressure applied at piston A is transmitted equally to piston B without diminishing, on use of an incompressible fluid.

Explanation:

Answer:

Drama: it has sadness anger and romance

and

i forgot about Prose =w=

Explanation:

Answer:

A. is the answer

Answer:

Resultant amplitude = 1 unit.

Explanation:

The amplitude of a wave is its maximum displacement during propagation.

Since the two waves are out of phase, the resultant amplitude can be determine by;

Resultant amplitude, [tex]A_{R}[/tex] = [tex]\sqrt{A_{1} ^{2} + A_{2} ^{2} + 2A_{1} A_{2}cos \alpha }[/tex]

                                        = [tex]\sqrt{(A_{1} - A_{2} )^{2} }[/tex]

                                        = [tex]A_{1}[/tex] -  [tex]A_{2}[/tex]

where [tex]\alpha[/tex] is the phase difference.

Given that: [tex]A_{1}[/tex] = 75 units, [tex]A_{2}[/tex] = 74 units, so that;

[tex]A_{R}[/tex] = 75 - 74

     = 1

The resultant amplitude of the two wave when out of phase is 1 unit.

Answer:

Resultant amplitude = 1 unit.

Explanation:

The amplitude of a wave is its maximum displacement during propagation.

Since the two waves are out of phase, the resultant amplitude can be determine by;

Resultant amplitude,  =

                                       =

                                       =  -  

where  is the phase difference.

Given that:  = 75 units,  = 74 units, so that;

= 75 - 74

    = 1

The resultant amplitude of the two wave when out of phase is 1 unit.

Answer:

A. Pp - square pant

    pp - round pant

B. 1 out of 2 or 50%

C. 1 out of 2 or 50%

Explanation:

Assuming that square pant shape is represented by the allele P, the alternate version (round pant) will be p.

Spongebob's genotype will be Pp since he is heterozygous for his square pant shape.

SpongeSusie's genotype will be pp since she is homozygous for her round pant shape.

Pp   x   pp

Progeny: 2Pp, 2pp (See the attached image for the Punnet's square)

Possible genotypes and phenotypes of the children:

Pp - Square pant

pp - round pant

Chances of a child with a square shape = 1/2 or 50%

Chances of a child with a round shape = 1/2 or 50%

Answer:

50

Explanation:

Answer: 0.8

Explanation:

The efficiency is defined as the ratio of total imput energy that is actually utilized to the end of the device.

So if we have a total transfer of 1500j of energy, and 1200j are used to heat the thing inside the kettle, 300j are not used to the actual function of the kettle.

So the efficiency is n = 1200j/1500j = 0.8

This means that a 80% of the energy imput is actually used to heat the kettle.

Answer:

Answer is radiant and chemical.

Hope this help:)

Sry if wrong

Answer:

its B

Explanation:

Answer:

It's B, No, because the grains are arranged in thin, parallel layers.

Explanation:

I literally took the test 5 seconds ago and it was right.

Answer:

The period is  [tex]T = 13.53 \ sec[/tex]

Explanation:

From the question we are told that

     The length of the cable is  [tex]L = 45.5 \ m[/tex]

Let take acceleration due to gravity as [tex]g = 9.8 \ m/s^2[/tex]

Now the period of the oscillation is mathematically represented as

          [tex]T = 2 \pi \sqrt{\frac{L}{g} }[/tex]

substituting values

          [tex]T = 2 * 3.142 \sqrt{\frac{45.5}{9.8} }[/tex]

          [tex]T = 13.53 \ sec[/tex]

Answer: 13.53

Explanation:

Answer:

The correct option is b: A solute depresses the freezing point because the solute disrupts the crystal formation of the solvent.

Explanation:

The depression of the solvent's freezing point is caused by the addition of a solute because the presence of the molecules of the solute interferes in the arrange and close up of the molecules of the solvent to form the crystal of the solid.

The attraction of the solute molecules to the solvent molecules interfere with the formation of the solid, so the solution must be cooled to a lower temperature so it can form the solid.

Hence, the correct option is b: A solute depresses the freezing point because the solute disrupts the crystal formation of the solvent. The other options are incorrect.

I hope it helps you!              

Answer:

(a) 165.46 V

(b) 7.78 A

Explanation:

(a) From the question,

Vrms = V₀/√2...................... Equation 1

Where V₀ = maximum potential difference across a lamp connected to the outlet.

make V₀ the subject of the equation.

V₀ = √2(Vrms)............... Equation 2

Given: Vrms = 117 V.

Substitute into equation 2

V₀ = (√2)(117)

V₀ = 165.46 V.

(b) Similarly,

I₀ = √2(Irms)....................... Equation 3

Given: Irms = 5.5 A

Substitute into equation 3

I₀ = (√2)(5.5)

I₀ = 7.78 A.

Answer:

f ’= 97.0 Hz

Explanation:

This is an exercise of the doppler effect use the frequency change due to the relative movement of the fort and the observer

in this case the source is the police cases that go to vs = 160 km / h

and the observer is vo = 120 km / h

the relationship of the doppler effect is

          f ’= f₀ (v + v₀ / v- [tex]v_{s}[/tex])

let's reduce the magnitude to the SI system

            v_{s} = 160 km / h (1000 m / 1km) (1h / 3600s) = 44.44 m / s

            v₀ = 120 km / h (1000m / 1km) (1h / 3600s) = 33.33 m / s

we substitute in the equation of the Doppler effect

          f ‘= 100 (330+ 33.33 / 330-44.44)

          f ’= 97.0 Hz