Bats use sound echoes to navigate and hunt. They emit pulses of high frequency sound waves which reflect off obstacles in the surroundings. By detecting the time delay between the emission and return of a pulse, a bat can determine the location of the object. What is the time delay between the sending and return of a pulse from an object located 12.5 m away

Yes, humans have significantly contributed to climate change. Over the past century, human activities such as burning fossil fuels and deforestation have released large amounts of carbon dioxide, a greenhouse gas, into the atmosphere. This has caused a drastic increase in average global temperatures and caused an array of environmental issues such as droughts, floods, and rising sea levels.

Three sources of evidence that suggest that humans have caused climate change are
- Studies of atmospheric carbon dioxide concentrations over the past 150 years have shown that the carbon dioxide levels have been steadily increasing since the start of the industrial revolution in the 1800s. This indicates that humans have been releasing large amounts of carbon dioxide into the atmosphere. (IPCC, 2013)
- Research has shown that the majority of the warming observed in the past 50 years has been caused by human activities (IPCC, 2018).
 - Computer simulations of climate have indicated that the observed warming trend over the past few decades could not have been caused by natural forces alone, and could only be explained by a combination of human-caused and natural factors (Meehl et al., 2005).

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Solution :

Crust

In the field of geology, the crust may be defined as the outermost solid shell of a planet. It forms the topmost outer hard layer of the earth surface. Earth has three layers. They are the crust, mantle and the core.

When we go deeper and deeper inside the earth's crust, the temperature rise. In the crust, on the surface of the earth, the temperature is normal and is atmospheric. As we go deep down the core, the temperature rise and it is highest at the core where all the rock and the iron is in the form of the molten lava.

According to the Geologist, beneath the earth's crust, for every mile we go inside the temperature rises by 15 degree Fahrenheit.

Hi there!

Recall the equation for spring potential energy:

\(PE = \frac{1}{2}kx^2\)

k = Spring constant (N/m)

x = extension of spring from equilibrium (m)

PE = Potential Energy (J)

Plug in the given values:

\(PE = \frac{1}{2}(4)(2^2) = \boxed{8 J}\)

According to the law of conservation of momentum, the total momentum of a system remains constant if no external forces act on it the total momentum of the system before and after the collision will be conserved. The correct option d.

The law of conservation of momentum states that in a closed system, the total momentum before a collision is equal to the total momentum after the collision, provided there are no external forces acting on the system. The law applies to both linear and angular momentum.

In the given scenario, the total momentum of the system before the collision is the sum of the momenta of the two disks. After the collision, the total momentum of the system should still be the same as before the collision if no external forces are present.

The individual velocities and directions of the disks after the collision may change, and they may continue to move at different velocities or even come to rest. The law of conservation of momentum does not dictate the velocities or outcomes of the individual objects involved in the collision. It only states that the total momentum of the system remains constant.

Therefore, option d) The total momentum of the system before and after the collision will be conserved is the correct statement according to the law of conservation of momentum.

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Answer:

200 N to the right

Explanation:

If the following forces act on an object: 20 N North, 50 N South, and 40 N west, then the magnitude of the net force would be 50 Newtons.

The quantities that contain the magnitude of the quantities along with the direction are known as the vector quantities.

Examples of vector quantities are displacement, velocity acceleration, force, etc.

As given in the problem if the following forces act on an object: 20 N North, 50 N South, and 40 N west.

The net force = √ ( 30² + 40² )

                      = 50 Newtons

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Answer ; 5

Explanation: hope it helps ur welcome

The power is generated by the machine that lifts the 50 kg box a

distance of 15 m in 8 seconds is 918.75 W (2nd option)

We'll begin by obtaining the work done by the machine in lifting the box. Details below:

Wd = mgh

Wd = 50 × 9.8 × 15

Wd = 7350 J

Finally, we shall determine the power generated. Details below:

P = Wd / t

P = 7350 / 8

P = 918.75 W

Thus, the power generated is 918.75 W (2nd option)

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Explanation: divided

The position of the jogger after 10 seconds will be 40 meters.

Velocity is defined as the ratio of the distance moved by the object at a particular time. The velocity is a vector quantity so it needs both the magnitude and the direction. The unit of velocity is measured in the meter per second, miles per hour, etc.

Given that a jogger travels west and passes a point that is 52 m west of a reference point. If the jogger travels at an average velocity of 4.0 m/s, the jogger's new position is 10.0s later. will be calculated as below:-

To calculate the distance traveled by the object convert the velocity formula into the form of the distance formula then solve for the value of distance.

Velocity = Distance / time

4 = Distance / 10

Distance = 4 x 10 = 40 meters

Therefore, the position of the jogger after 10 seconds will be 40 meters.

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The toxic salt will harm the salamander species.

Hence, the correct option is B,

To determine the concentration of the toxic salt in the ditch after it fully mixes and is diluted by the entire volume of the ditch, we can use the formula for concentration:

Concentration (C) = Mass of Salt (M) / Volume of Water (V)

Given:

Mass of Salt (M) = 60.2 mg

Volume of Water (V) = Area (A) * Length (L) = 0.5 \(m^{2}\) * 15 m = 7.5 \(m^{3}\)

Using the formula:

Concentration (C) = 60.2 mg / 7.5 \(m^{3}\)

Concentration (C) = 8.03 mg/ \(m^{3}\)

To convert from mg/ \(m^{3}\) to mg/L, we multiply by 1000:

Concentration (C) ≈ 8.03 mg/ \(m^{3}\) * 1000 = 8030 mg/L

The concentration of the toxic salt in the ditch, after it fully mixes and is diluted by the entire volume of the ditch, is approximately 8030 mg/L.

Since the concentration of the toxic salt exceeds the threshold for biological impairment, which is 100 mg/ \(m^{3}\) or 100 mg/L, the endangered salamander is at risk.

The concentration of the salt in the ditch is significantly higher than the level at which biological impairment occurs, indicating potential harm to the salamander species.

Therefore,The toxic salt will harm the salamander species.

Hence, the correct option is B,

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Answer:

Models are used to study atoms because we can never really see an atom up close, and a model is like a super magnified version of the atom. Plus, its easier to study from them because we can pin point the different characteristics of the atom (Protons, Neutrons, etc.)

Explanation:

Hope this helps! :>

Answer:

I believe its because the molecules are to small to see with the human eye and because the process would be very dangerous and somebody could get hurt.

Answer:false

Explanation:because it means you're pushing yourself too much and you need to use smaller weights

P= 10m = 10 x 180 = 1800 N

work is done by the weightlifter in lifting the barbells :

A= Ph = 1800 x 1.95 = 3510 J

ok done. Thank to me :>

I believe the answer would be B.solids.

Explanation:

Hope this helped!

In solids these can convection not occur and convection can occur in both liquids and gases, as they are both considered fluids. Thus, option B is correct.

However, convection cannot occur in solids, as the particles in solids are generally fixed in position and do not have the freedom to move and transfer heat through bulk motion as in convection.

A solid is one of the three fundamental states of matter, along with liquids and gases. It is characterized by having a definite shape and volume. Solids are composed of tightly packed particles, such as atoms, molecules, or ions, that are held together by strong intermolecular forces.

These particles vibrate in fixed positions but do not have the ability to move freely throughout the substance. As a result, solids maintain their shape and volume under normal conditions and exhibit relatively low compressibility compared to gases and liquids. Examples of solids include metals, rocks, wood, plastics, and ice.

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For a frictionless pulley with mass connected by a light string, the acceleration for the system when released is equal to 6.5m/s²

Using the formula a = (m₂ - m₁)g/(m₁ + m₂)

Where a = acceleration, m = mass and g = gravity

m₁  = 2kg

m₂ = 10kg

g = 9.8m/s²

Applying to the formula, a = (m₂ - m₁)g/(m₁ + m₂) to find the acceleration of a frictionless pulley when released;

a = (10 - 2)(9.8)/(2 + 10)

a = 8(9.8)/12

a = 6.5m/s²

Therefore the system's acceleration 6.5m/s²

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Answer:

4.3186km

Explanation:

If a car drives 0.696 km North, and then turns and drives 4.326 km East, the magnitude of the car's resultant displacement will be gotten using the Pythagoras theorem as shown;

d² = x²+y²

Given;

x = 4.326km

y = 0.696km

Substitute into the formula and get d;

d² = (4.326)²+(0.696)²

d² = 18.714276+0.484416

d² =19.198692

d = √19.198692

d = 4.3816km

Hence the magnitude of the car's resultant displacement is 4.3186km

Answer:

A trough

Explanation:

A trough is an elongated area of relatively low pressure extending from the center of a region of low pressure.

I HoPe ThIs Helps!!!

Answer:

The answer should be True, but it's False on Edge 2021

Explanation:

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Answer:

A wedge can split an object apart

A  lever is the seesaw

inclined plane is a ramp

a pulley can reduce the amount of friction

wheel and axle is the rope one

Explanation:

Following are the matches:

Simple machines are basic mechanical devices that can help make work easier by reducing the amount of force or effort needed to do a task. They are usually the most basic forms of machines, often made up of only one or two parts, and are used to change the direction or magnitude of a force.

There are six types of simple machines:

Simple machines are the building blocks for more complex machines, and they are used in many everyday devices and equipment to make work easier and more efficient.

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The observed change in wavelength due to the Doppler effect occurs when there is relative motion between a source of waves and an observer. It causes a shift in the observed frequency or wavelength, resulting in either a higher pitch (blue shift) or a lower pitch (red shift).

The observed change in wavelength due to the Doppler effect occurs when there is relative motion between a source of waves and an observer. This phenomenon can be observed in various situations, such as sound waves, light waves, and even waves in water.

When the source of waves is moving towards the observer, the observed wavelength decreases. This means that the waves are compressed, resulting in a higher frequency or pitch. This is known as a blue shift. On the other hand, when the source is moving away from the observer, the observed wavelength increases. This means that the waves are stretched, resulting in a lower frequency or pitch. This is known as a red shift.

The Doppler effect has important applications in various fields. In astronomy, it is used to determine the motion of celestial objects and measure their radial velocity. In meteorology, it helps in studying weather patterns and predicting the movement of storms. In medical imaging, it is used in techniques like Doppler ultrasound to visualize blood flow and detect abnormalities.

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The observed change in wavelength due to the Doppler effect occurs when the distance between the source of the wave and the observer changes.

The Doppler effect can be seen when a wave source is moving relative to an observer.In a long answer, we can explain that the Doppler effect is the change in frequency or wavelength of a wave that is perceived by an observer moving relative to the wave source. The effect is most commonly experienced with sound waves, where it results in a change in the pitch of a sound.

However, it also occurs with electromagnetic waves, including light.In the case of light, the observed change in wavelength due to the Doppler effect occurs when the distance between the source of the wave and the observer changes. If the source of the wave is moving closer to the observer, the wavelength of the wave appears shorter (bluer). If the source is moving away from the observer, the wavelength of the wave appears longer (redder). This is known as the redshift and blueshift, respectively.

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We can use the conservation of momentum and the principle of conservation of energy to determine the magnitude of the momentum of each particle in the frame of the center of mass.

Initially, the two particles are at rest and separated by a large distance. Therefore, the initial momentum of the system is zero. As the two particles approach each other, they will accelerate towards one another due to their mutual gravitational attraction. The distance between them will decrease and their speed will increase.

At some point, the particles will be at a separation r and will have a velocity v relative to the center of mass. The magnitude of the momentum of each particle can be calculated as follows:

Conservation of momentum:

The total momentum of the system is conserved, so the momentum of the two particles must be equal in magnitude and opposite in direction.

m1v1 + m2v2 = 0

Centre of mass:

The center of mass of the system is given by:

r_com = (m1r1 + m2r2) / (m1 + m2)

Since the particles are initially at rest, their initial positions are given by:

r1 = -r2 = r_initial

At separation r, the positions of the particles are given by:

r1 = r_com + r / 2

r2 = r_com - r / 2

Conservation of energy:

The total energy of the system is conserved. Initially, the particles are at rest and have no potential or kinetic energy. At separation r, the kinetic energy of the system is given by:

KE = (1/2) m1v1^2 + (1/2) m2v2^2

The potential energy of the system is given by:

PE = -G m1 m2 / r

where G is the gravitational constant.

At separation r, the total energy of the system is:

E = KE + PE

Substituting the expressions for KE and PE:

E = (1/2) m1v1^2 + (1/2) m2v2^2 - G m1 m2 / r

Since the total energy is conserved, the value of E is the same at all separations.

Substituting for v1 and v2 from the conservation of momentum equation:

v1 = - v2

We can express the momentum of each particle in terms of the relative velocity v and the masses m1 and m2:

p1 = m1 v / 2

p2 = - m2 v / 2

Substituting these expressions into the equation for the center of mass:

r_com = (m1r1 - m2r2) / (m1 - m2)

we can eliminate v and obtain an expression for the momentum of each particle in terms of the masses and separation:

p1 = p2 = (m1 m2 v) / (m1 + m2)

Substituting the expression for v from the conservation of energy equation:

v^2 = 2 G m1 m2 / (r (m1 + m2))

we obtain the final expression for the magnitude of the momentum of each particle:

p1 = p2 = sqrt(2 G m1 m2 r / (m1 + m2))

Therefore, the magnitude of the momentum of each particle in the frame of the center of mass is given by:

p1 = p2 = sqrt(2 G m1 m2 r / (m1 + m2))

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Answer:

insulators- rubberband, toothpick,

conductors- penny, nickel, key, paperclip

Explanation:

reasoning

Answer:

The final two would be of your choice. Honestly you could just search if a rubber band is a insulator or conductor and so on. Just a tip on future assignments.

Explanation:

I just did this assignment 5 minutes ago

Answer:

2 hours

Explanation:

Answer:

721.5 N

Explanation:

F= m X a            F=8.18 kg x 88.2 m/s²    =  721.5 N

not sure if this is correct just guessing

721.5 N

F= m X    F=8.18 kg x 88.2 m/s²    =  721.5 N

To reduce the speed slow down and decelerate a car. 2: to decrease the rate of progress of decelerate growth decelerate soil erosion. intransitive verb. : to move at decreasing speed.

Deceleration is a slowing down: the unexpected deceleration of your car might mean that you've run out of gas. Use the noun deceleration when you talk about a gradual decrease in speed.

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Hard glass is a type of glass characterized by its high resistance to thermal and mechanical stress. It is commonly used in scientific and industrial applications. The components of glass can be classified into formers, intermediates, and modifiers.

Hard glass, also known as borosilicate glass, is a type of glass that possesses high resistance to thermal expansion and mechanical stress. It is composed mainly of silica (SiO2) and boron oxide (B2O3), which act as formers in the glass structure. The formers provide the basic framework of the glass and contribute to its high durability and thermal stability.

In addition to formers, glass can also contain intermediates and modifiers. Intermediates, such as alumina (Al2O3) and magnesia (MgO), help in reducing the melting point of the glass and improve its workability during the manufacturing process. Modifiers, such as sodium oxide (Na2O) and calcium oxide (CaO), alter the properties of the glass, such as its refractive index and chemical resistance.

By combining the right proportions of these components, glassmakers can produce glass with specific characteristics suitable for various applications, ranging from laboratory equipment and optical lenses to household items and industrial containers.

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