a sonar system can use sound waves wih a frequency of 120kHz or 200kHz. A. what is the wavelength of each of these waves when they are sent through sea water?
B. What are their wavelengths in freshwater?
C. The ship operating these sonar systems is in sea water with a depth of 3km.
How long will it take an echo to return to the ship after a ‘ping’

Answer: 58.8235 km/h

speed = distance/time

the distance is 10 km

the time is 10 minutes

the unit is not correct, so we first change minute to hour

so 10/60 is 0.166667, rounded to 0.17.

10 km/ 0.17 hours =

Some fats are good for you like Monounsaturated ( A ) and Polyunsaturated ( C ) fats.

Monounsaturated and Polyunsaturated fats lower the risk of disease. These are good unsaturated fats. Foods that are rich in good unsaturated fats are fish, seeds, nuts and vegetable oils. Some of the vegetable oils that are good for health are olive, canola, sunflower, soy and corn oil.

Hydrogenated oil produces trans fat. If trans fat is taken even in small quantities, it increases disease risk. Food items rich in saturated fats are butter, cheese, ice cream, coconut oil etc. Eventhough these are not as harmful as trans fats, it is better to be consumed in moderate quantities.

Therefore, some fats are good for you like Monounsaturated ( A ) and Polyunsaturated ( C ) fats.

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Rock, metal, ice, and gas are distributed in the solar system in an orderly manner.

Numerous tiny things in the Solar System are orbiting the Sun, including an unknown number of dwarf planets. Natural satellites, also known as "moons" after the Moon of Earth, orbit the six major planets, the six largest dwarf planets, and many of the smaller worlds. Jupiter's moon Callisto is almost as big as Mercury, the smallest terrestrial planet, and two natural satellites, Saturn's moon Titan and Jupiter's moon Ganymede, are both larger but not more massive than Mercury. Solar System is around the earth.

Planetary rings made of ice, dust, and moonlets surround each of the large planets as well as a few minor worlds. Objects made of rock, metal, and ice can be found in the asteroid belt, Solar System is located between the orbits of Mars and Jupiter.

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A psychologist differ from a biologist in that a psychologist deals with helping people solve their emotional and mental problems by way mind analysis while biologists are scientists who studies living organisms.

Biology refers to the study of life. Someone who studies biology is called a biologist.

The biologists helps us to understand the following:

So therefore, a biologists helps us understand all about plants and animals while the psychologists deals with studying human minds.

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Answer:

battery

Explanation:

A battery establishes an electric potential difference.

Answer:

D) Battery

Explanation:

Battery is a source that produces electric charges with different concentrative regions

[tex].[/tex]

The resulting energy balance is q= -9623kj

What is resulting energy ?

resulting energy sorted in objects , molecules and atom , energy take many different forms .

It can be converted one into another .

Solution -

The vessel is 10m^3 and initially contains 100 kg of stream. so we can get

V= 0.1 m^3/kg

Between specific value and saturated liquid and saturated vapour at p= 2

So q = 0.112

Is rigid so the final mixture which has a mass of 110kg

Q= 0.149

Start with the independent energy balance it state that

- this is not a steady state process.

-please visit so no expension work.

-no mention of moving parts.

Thus the final result energy balance is - q= -9623 kj

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Momentum of system remains conserved before and after the collision. Thus, a. Total momentum of system, p = 125kg-m/s

b. New momentum of first object, p = 100kg-m/s

c. Momentum transferred to 1.0kg object, p = 41.6kg-m/s

d. Final velocity of 1.0kg object, v = 41.6m/s

Given, mass of first object  [tex]m_{1}[/tex]= 5.0kg and mass of second object [tex]m_{2}[/tex] = 1.0kg

Velocity of first object [tex]v_{1}[/tex]= 25m/s and velocity of second object [tex]v_{2}[/tex] =0 m/s

Thus, Total momentum of the system, p = mv

[tex]p= m_{1} v_{1} +m_{2} v_{2}[/tex]

p = 5*25 + 1*0

p = 125kg-m/s

Now, after collision first object continues to move with final velocity 20m/s. Hence, new momentum, p = mv

p = 5*20

p = 100 kg-m/s

Momentum transferred to 1.0kg object, p= mv

where m = 1.0kg and v = final velocity of 1.0kg object

For calculating final velocity of second object,

[tex]v_{2f} = (\frac{2m_{1} }{m_{1} +m_{2} } )v_{1i}+ (\frac{m_{2}-m_{1} }{m_{1}+m_{2} } )v_{2i}[/tex]

[tex]v_{2f}[/tex]= [tex](\frac{2*5}{5+1} )25 + (\frac{1-5}{5+1} )[/tex]*0

[tex]v_{2f} = 41.6 m/s\\[/tex]

Thus, momentum transferred to 1.0kg object, p = mv

p = 1* 41.6

p = 41.6kg-m/s

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The coefficient of kinetic friction between the book and the carpet is 0.23.

The coefficient of kinetic friction is the ratio of the friction force to the normal force experienced by a body moving on a dry, rough or non-smooth surface.

From Newton's second law of motion, the coefficient of kinetic friction is calculated as follows;

F - Ff = ma

where;

Since force of friction is the only force acting on the object, our final equation becomes;

-Ff = ma

-μmg = ma

-μg = a

-μ = a/g

μ = - a/g

The acceleration of the book is calculated as follows;

v² = u² - 2as

where;

When the book stops, the final velocity, v = 0

0 = u² + 2as

-2as = u²

-a = u²/2s

-a = (3.85²) / (2 x 3.25)

a = - 2.28 m/s²

Coefficient of kinetic friction = - (-2.28 m/s² / 9.8 m/s²)  = 0.23

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The pressure exerted by the girl on the ground if she stands on two feet is 18333.33 N/m².

The pressure exerted by the girl on the ground if she stands on two feet is calculated as follows from the formula of pressure.

Pressure is defined as the force per unit area or the ratio of force exerted and the area in which the force is exerted.

Mathematically;

Th unit of pressure is N/m²

The force exerted by the girl is equal to the weight of the girl

Force = 550 N

Area of one shoe = 150 cm²

Area of one shoe in m² =  150 cm² * 1 m²/10000 cm²

Area of one shoe in m² = 0.015 m²

Area of two shoes = 2 * 0.015 m² = 0.03 m²

Pressure = 550/0.03 N/m²

Pressure = 18333.33 N/m²

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Complete question:

A girl weighs 550 N. The girl is wearing shoes with an area of 150cm². What pressure will be exerted by the girl on the ground if she stands on two feet?

Answer: (a) No we cannot able to move the electron with strong magnet field.

(b) yes we can able to move the electron with strong electric field

Explanation: Theoretically, both the gravitational and electric fields might speed up a travelling electron, but in most situations, only the electric field will do so significantly. Since the magnetic force is always perpendicular to the velocity, it will not affect the speed of an electron in motion.

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By applying a strong magnetic field, the electron will not travel. By applying an opposite electric field or the same electric field, the electron will move in a different direction, respectively.

The definition of an electric field is the electric force per unit of charge. It is assumed that the field's direction corresponds to the direction in which a positive test charge would experience force. The electric field is directed radially inward toward a negative point charge and radially outward from a positive charge. a circumstance present in the vicinity of a magnet or an electric current, defined by the presence of magnetic poles and a discernible magnetic field at every point in the vicinity.

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Answer:

use the equations of motion

The acceleration by the trolley for moving to East side would be 2.4 m/s^2 according to law of equation.

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Convection differs from radiation in the sense that in radiation, matter is not involved. Option D.

The term heat transfer has to do with the movement of heat from one point another. Recall that heat transfer is one of the things that does occur in nature. There are three kinds of heat transfer that occur in nature and these are;

Let us recall that in the process of convection, there is the movement of heat from one point to the other via the actual movement of the particles of the substance.  On the other hand, radiation occur when heat is transferred without an movement or contact between the objects  between which the heat is transferred. Thus, when air masses are moving, it is a process of convection taking place.

Hence, the difference between conduction and radiation is that matter is involved in convection but not in radiation.

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Answer:

1. Thermal Energy

Explanation:

Sunlight will take 8 minutes to reach the Earth.

Sunlight is part of the electromagnetic radiation emitted by the Sun, especially infrared, visible and ultraviolet light.

Light is travelling with the speed of [tex]3 * 10^{8}[/tex] m/s

Distance between Sun and Earth is 144 million km

1 km = 1000 m

1 million km = [tex]10^{6}[/tex] km

[tex]10^{6}[/tex] km = [tex]10^{9}[/tex] m

144 million km = 144 * [tex]10^{9}[/tex] m

According to the speed, distance and time relationship, speed is directly proportional to the ration of distance and time.

[tex]3 * 10^{8} = \frac{144 * 10^{9} }{Time}[/tex]

Time = [tex]\frac{144 * 10^{9} }{3* 10^{8} }[/tex]

Time = 480 sec

Time = 8 minutes

Time taken by the sunlight to reach the Earth's surface is 8 minutes.

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The electric potential energy of the pair of charges when the second charge is at point b is U at b = +7.3×10⁻⁸J.

Electric potential is the amount of work done in moving point charge from infinity to aspecific point.

Calculation of the electric potential energy:

Here the particle should be moved from the point at the time when the potential energy should be U a

The U b should be the change in the potential energy

W is work done.

(W at a )-(W at b)  = U a - U b

U b = U a - (W at a )+(W at b)

So,

= 5.4 × 10⁻⁸J - ( -1.9×10⁻⁸ J)

= +7.3×10⁻⁸J.

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       Acceleration: the rate at which the speed and direction of a moving object vary over time.

After that, we'll describe the necessary kind of force. Complete response: Foot muscles are used to kick a football. Muscular force is hence the type of force used.

It is a multi-joint movement that requires the synchronization of several stabilizing and neutralizing muscles, mainly those in the hip and leg. Power and accuracy must be combined for a successful football kick, and depending on the technique, it may be either forceful or accurate.

Acceleration. The soccer ball would be kicked in this scenario, and the ball would move as a result of the motion. Kicking the soccer ball causes it to accelerate. When kicking a soccer ball, the average acceleration is roughly 8 meters per second.

Therefore, the imbalanced force is what causes the football to move, and it also affects the football when we kick it. As a result, option (B) is true since kicking a football is an example of unbalanced force.

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Im not sure but no one can kek lskhd. akshd

when running a line, in a right-triangle, from the 90° angle perpendicular to its opposite side, we will end up with three similar triangles, one Small, one Medium and a containing Large one.  Check the picture below.

[tex]\cfrac{x}{11}~~ = ~~\cfrac{4}{x}\implies x^2=44\implies x=\sqrt{44}\implies x=2\sqrt{11}[/tex]

Due to the gas within cooling off due to the low temperature, the balloon's volume shrinks.

The helium balloon rises because it is lighter than the same amount of air at ambient temperature. It is heavier than the same volume of air at low temperatures because its volume is too small. Because the average kinetic energy of the gas molecules in a balloon drops as temperature rises, the frozen balloon shrank. As a result, the molecules move more slowly and collide with the balloon's interior wall less frequently and weakly, causing the balloon to somewhat contract.

If the temperature remains constant and the pressure decreases, the volume will increase (balloon expands). If the pressure increases while T remains constant (let's say you're holding the balloon underwater), V will decrease (balloon shrinks). When the temperature rises and the volume remains constant (like in an aerosol can), P increases.

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Answer:

A physical balance can be used to measure both mass and weight of an object.

The car travels a distance of 75 m.

Given:

Initial velocity (u) = 0 m/s

Because the body stars from rest,

Time (t) = 5 sec

Final velocity = 15m/s

Using first equation of motion,

v = u + at

15 = 0 + a(5)

5a = 15

a = [tex]\dfrac{15}{5}[/tex]

a = 3 [tex]m/s^{2}[/tex]

∴Therefore Acceleration = 3m/s²

Using third equation of motion:-

s = Ut + ½ at²

s = (0 × 5) + ½ × 3 × (5)²

s = ½ × 3 × 25

s = [tex]\dfrac{75}{2}[/tex]

s = 37.5m

Hence the  Distance moved by the car  = 37.5 m

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The current in the filament is halved following the doubling of its length.

Let the current flowing in the filament as I, the electric field in the conductor is E and the length of the conducting filament is L.

We know from ohm's law,

I = V/R

where V is the potential difference and R is the resistance of the conductor,

We also know,

R = ρL/A

where ρ is the resistivity of the conductor and the A is the area of the conductor,

I = VA/ρL

I/A = V/ρL

I = AE/ρ

if area and resistivity are constant,

I ∝ E

Here E = V/L

If V = constant,

E ∝ 1/L

Means we can conclude,

I ∝ E ∝ 1/L

So we can tell that on doubling the length of the filament will decrease the current by half.

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The speed of an item, which is a scalar quantity, is the size of the change in its location over time or the size of the change in its position per unit of time.

Speed is defined as the rate at which a distance travelled or a height reached changes. It has a time component. It is represented by the letters u for the starting speed and v for the ending speed. M/sec is the SI unit used.

Momentum is the result of an object's mass and velocity. It is a vector quantity since it has both a magnitude and a direction.

Because the astronaut and capsule are at rest, their initial momentum is zero.

Pf = Ma*Va + Mc*Vc

Pi = 0

Ma*Va + Mc*Vc = 0

Vc = Ma*Va / Mc

Vc = (128 * 2.56) / 1880

Vc = 0.174 m/s

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There are three factors that affect gravitational potential energy:

Gravitational potential energy is potential energy an object holds when falls towards another object due to gravity.

for instance, if we lift a stone and try to throw it from a height, it will have gravitational potential energy whereas stones in the ground have no gravitational potential energy.

the formula of GPE:  E = mgh where

m = mass, g = gravity and h = height

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Answer:

Γ = r x F      vector notation for torque

Doubling r (the length) will double the torque applied

Gravity, friction, and drag force are the forces that are acted on a car.

Gravity is defined as a force by which one body attracts other objects toward its center. Friction is the force that resists the relative motion of solid surfaces, fluid, and material that are sliding against each other. There are several types of friction force i.e. Dry friction is a type of force that opposes the relative motion of two solid surfaces that are in contact with each other.

Drag is a mechanical force that is generated by the interaction and physical contact of a solid body with a liquid or gas. It is not produced by a field force, gravitational field, or an electromagnetic field, in which one object can affect another object without any physical contact with each other.

So we can conclude that the forces acting on the car are gravity, friction and drag force.

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C. The mass of the gases and the ash should equal the mass of the initial stack of newspapers. (conservation of mass)

Answer:

c

Explanation:

The elements which are in the unknown according to the diagram given is He and is therefore denoted as option C.

This is referred to as a type of graph which shows the intensity of light being emitted over a range of energies and it varies with properties such as wavelength or frequency. When light is passed through a prism, band of colors are usually observed which signifies light spectrum with the plural being spectra.

In the diagram given , the element He and the unknown have the most similar spectra observed as a result of the lines which fall in almost the same range and place and it makes it the most likely component of the mixture of unknown gases.

This is therefore the reason why option C was chosen as the most appropriate choice.

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The weight of the suspended object is determined as 39.82 N.

The resultant force is described as the total amount of force acting on the object or body along with the direction of the body.

The weight of the suspended object is equal to the resultant force of the tension in the two ropes.

Let the resultant force = W

The value of of the resultant force is calculated as follows;

W² = 25²  +  31²

W² = 1,586

W = √1586

W = 39.82 N

Thus, the weight of the suspended weight will be greater than the tension in each rope.

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