The focal point of a concave mirror is _____ the mirror. ( in front of; behind)

Answer:

A plane mirror forms a virtual, erect, same size and laterally inverted image. Virtual means that the image is not real and cannot be obtained on screen. It means the rays appear to meet behind the mirror but when you will actually go behind, you will find nothing. A virtual image is always erect.

A real image is always inverted. It can be obtained on the screen. Rays actually meet at a point.

A virtual image in a plane mirror appears to be behind the mirror because the light rays do not actually converge there. You can see and photograph a virtual image, but it cannot be projected onto a screen.

The word “virtual” refers to something that exists in effect but not in actual fact. In the context of a plane mirror, a virtual image is one where the light rays appear to diverge from a point behind the mirror, but they do not actually meet there. When you look at yourself in a plane mirror, the image you see is indeed a virtual image because it appears to be behind the mirror where light does not truly exist. The rays of light reflecting off your face diverge and appear to the observer as if they are coming from a point behind the mirror.

General Characteristics of Acids & Bases. Chemists measure the strength of an acid or base by its pH, which is a term that refers to the "power of hydrogen.". The midpoint of the pH scale is neutral. Compounds with a pH lower than the midpoint value are acidic while those with a higher value are basic or alkaline.

Answer:

A constant magnetic field creates an electric field.

Explanation:

Well, by definition, a magnetic field produces forces on moving charges. So if there’s just a magnetic field, and there’s a conductor with no charges already moving, there’s no reason for them to start to move, and plenty of reason (Ohm’s law) for them to stop.

Mind you, if you drag the conductor sideways through the field, the magnetic field will push the charges sideways to sideways, i.e., along the wire, giving an EMF and, if there’s a closed circuit, a current. This is probably the most common way of doing things.

Answer:

A moving magnetic field creates an electric field.

A moving electric field creates a magnetic field

Explanation:

Magnetic Field is the concentration of magnetism that is created around a magnetic charge in a given space. It is the magnet that creates the magnetic field, just as it is the electric charge and the mass that, respectively, create the electric and gravitational fields.

The origin of the magnetic field is in the movement of electrical charges. When the electric field oscillates in some region of space, this oscillation gives rise to a magnetic field oriented in a direction perpendicular (90º) to the electric field. To better understand the properties of the magnetic field, we make use of a feature known as induction lines, through which we can better visualize the shape of the magnetic field.

The molecules in hot gas move faster than cold gas. This would allow sound waves to travel faster.

Vacuums, do not have air pressure to transfer energy, so sound would not be able to travel very fast.

The answer is B. Hot Gas.

Answer:

Option B

Explanation:

Sound waves are mechanical waves it means they require a material medium for their propagation.

So, sound cannot travel through hot vacuum or cold vacuum.

The velocity of sound waves is directly proportional to the square root of absolute temperature of gas.

As the temperature of hot gas is more so sound travel fastest in hot gas.

Answer:

B. The core is the thickest of Earths layers

Explanation:

Option A  is incorrect because the crust is way thinner than the mantel.

Option C is incorrect because the inner core is 1k whereas the outercore is 2k

Option D is incorrect because the crust is the thinnest layer

The core is the thickest of earths layers,is the conclusion is supported by information in the table.

The core is the thickest of earths layers,is the conclusion is supported by information in the table.

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Answer:

1.45 K

I had the same question and i got it right.

Answer:

T = 1.45 K

Explanation:

As per Wein's law we know that

[tex]\lambda = \frac{2.9 \times 10^6 nm K}{T}[/tex]

here we know that

[tex]\lambda[/tex] = wavelength of peak intensity

[tex]T [/tex] = temperature of the object

so as per above formula we know that

[tex]\lambda = 2 \times 10^6 nm[/tex]

so we have

[tex]2 \times 10^6 = \frac{2.9 \times 10^6 nm K}{T}[/tex]

[tex]T = 1.45 K[/tex]

Answer:

the main ingredient that helps a cake rise is baking powder (sodium bicarbonate); when it interacts with the heat, it creates a chemical reaction that produces carbon dioxide (tiny bubbles) to allow the cake to be light and fluffy.

This is a type of chemical reaction...exothermic (reaction that produces heat) and endothermic (reaction of taking the heat in).  Endothermic chemical reaction that changes the batter from the thick liquid state to a firm, fluffy state.

Explanation:

Answer:

550 W, 0.55 kW

Explanation:

Power = Current * Voltage

P = 5A * 110V

P = 550 W

There's 1000 W in 1 kW, so P = 0.55 kW.

If an electric soldering iron takes 5 amperes at 110 volts,then the power used in watts would be 550 watts

The power used in kilowatts comes out to be 0.55 kilowatts.

The rate of doing work is known as power. The Si unit of power is the watt.

Power =work/time

The mathematical expression for the power is as follows

P = VI

where P is the power

V is the voltage

I is current passing through the circuit

As given in the problem an electric soldering iron takes 5 amperes at 110 volts,

I = 5 Ampere

V = 110 volts

By substituting the values of the current and the voltage in the formula of the electric power

P = VI

P= 110V × 5 A

P= 550 watt

1000 watts = 1 kilowatt

1 watt = 1/1000 kilowatts

550 watt = 550/1000 kilowatts

                = 0.55 kilowattts

Thus, the power used in watts would be 550 watts and the power used in kilowatts comes out to be 0.55 kilowatts.

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Answer:

B. 285 km/5 min

Explanation:

The rule that links velocity, wavelength and frequency is:

V = λν

where:

V is the velocity that we want to find

λ is the wavelength of sound = 1 m

ν is the frequency of the wave = 950 Hz

Substitute to get the velocity as follows:

V = 1 * 950 = 950 meters/sec

Now, we need to convert the meter/sec into Km/5 minutes

We know that:

To convert from meter to Km, we will divide by 1000

To convert from sec to minute, we will divide by 60 which means that, to convert from sec to 5 minutes, we will divide by 5*60 = 300

Based on this:

[tex]950 \frac{meter}{sec}=950*\frac{\frac{1}{1000}}{\frac{1}{300}} = 950*\frac{3}{10}=285 km/5 min[/tex]

Hope this helps :)

Final answer:

To find the distance travelled by sound in 5 minutes, we calculate the speed using the formula v = fλ, resulting in 950 m/s. Converting to km/min and multiplying by the time, we find the sound travels 285 kilometers in 5 minutes, corresponding to option B.

Explanation:

The question is asking to calculate the distance travelled by sound with a given frequency and wavelength over a period of 5 minutes.

First, we find the speed of sound (v) using the formula v = fλ, where f is frequency and λ is wavelength.

Speed of sound = 950 Hz × 1 m = 950 m/s.

To convert speed to kilometers per minute, we divide by 1000 to convert meters to kilometers and then multiply by 60 since there are 60 seconds in a minute:

Speed in km/min = (950 m/s) / 1000 × 60 = 57 km/min.

To find the distance travelled in 5 minutes, we multiply the speed in kilometers per minute by the duration:

Distance travelled = 57 km/min × 5 min = 285 km.

Therefore, the correct answer to the question is 285 kilometers, which corresponds to option B.

Answer:

2 2/3 m/s²

Explanation:

Acceleration is a measure of change in speed over time. What it means mathematically is the difference between your ending and starting speed divided by the total time between.

Here, our starting speed is 5 m/s and our ending speed is 13 m/s, so our change in speed is 13 m/s - 5 m/s = 8 m/s, and our total time between is 3 s, so that gives us an acceleration of (8 m/s) / (3 s), which is 8/3 m/s², or 2 2/3 m/s²

(A little note: m/s² is just an abbreviation for m/s/s, or "meters per second per second," and you read it as "meters per second squared")

Answer:

Explanation:

That an optical illusion somehow interferes with the way we see things. Even simple illusions can completely fool us. If you search out the term, you'll see all kinds of them.

Most critically we see one thing and know another to be true. But knowing the truth doesn't help us. We still see and believe the truth of the illusion.

The correct answer to this open question is the following.

Psychologists learned about perception from optical illusions that the response of the senses, when faced with optical stimuli, is different and can be measured because the human can interpret an optical stimulus as being real.

Gustav Fechner (1801-1887) was a German physicist who developed the science that studied quantitative relations of stimuli and sensations. It is called psychophysics. In 1860, he published the book "Elements of Psychophysics," in which he studies how the perception determines the sensory input.

Answer: It should be A

Explanation:

Answer:A. Longitudinal waves

Explanation: The displacement of the medium parallel to the propagation of the wave is a characteristic of longitudinal waves. Longitudinal waves are also characterized by compression and rarefraction.

A wave propagated along the length of a stretched Slinky toy, the increase and decrease of the coil gives a good example of longitudinal wave.

C. an ax

wedges is anything that has a tip that tappers at the end. This means that one end is thicker and the other is thinner

Hope this helped!

~Just a girl in love with Shawn Mendes

Answer:

Rutherford described the atom as consisting of a tiny positive mass surrounded by a cloud of negative electrons. Bohr thought that electrons orbited the nucleus in quantised orbits. Bohr built upon Rutherford's model of the atom. ... So it was not possible for electrons to occupy just any energy level.

Explanation:

Rutherford's model described electrons in orbits like a solar system, which would lead to collapse, whereas Bohr's model introduced quantized orbits that explained atomic stability and spectra.

The main difference between Rutherford's model of the atom and Bohr's model of the atom lies in how they describe the behavior of electrons around the nucleus. Rutherford's model predicted a miniature solar system with electrons in circular or elliptical orbits that, according to classical mechanics, would cause the atom to collapse due to continuous electromagnetic radiation emission. However, Bohr's model introduced the concept of quantized orbits, assuming electrons to move in circular orbits with quantized energies, angular momentum, and radii based on the quantum number 'n.'

Bohr's quantum theory was a significant advancement as it explained why electrons do not radiate energy as they orbit the nucleus. In Bohr's model, electrons remain in their quantized orbits without emitting electromagnetic radiation, but when an electron transitions between orbits, the atom emits or absorbs electromagnetic radiation, resulting in discrete spectra that align with observational evidence. This model, while still incorporating aspects of classical mechanics, corrected the stability issue of the atom and provided a basis for explaining atomic spectra, particularly that of hydrogen.

To make the maximum stress the same across the entire section, the proportion needs to be X squared.

The answer is X^2

Answer: Option d

Explanation:

According to Newton's third law, for every force "P" that is applied on an object there is a force -P that has the same maginitud that "P" and opposite direction.

In other words "for every action there is an  equal and opposite reaction"

For example, if Object D applies a force "P" on an object B, then object B will make a force -P on object D.

This force is called the reaction force.

Therefore when the swimmer pushes the wall, then the wall pushes the swimmer with a force of the same magnitude that is called the reaction force.

Answer:

Explanation:

A swimmer uses her feet to push off the wall and the wall exerts the same force back on her. The force exerted by the wall on the swimmer is called ____________.

A. action force

B. friction

C. gravity

D. reaction force

Answer:

F = MLT^-2

Explanation:

Dimension of force

Force = Mass × acceleration

= Mass × (displacement/time²)

= M¹ × (L¹/T²)

= M¹ × L¹T-²

Force = MLT^-2

Thus, The dimension of Force is MLT^-2

Explanation:

the Dimension of force is MLT^-2

Answer:

A and D

Explanation:

A and D, since fuses + circuit breakers are made to prevent any further damage from an excessive amount of current. So, them breaking/tripping means that there are too many appliances on a parallel circuit, since adding resistors creates more current.

Options A and D are correct.When too many appliances are drawing from the same parallel circuit, the circuit may overheat blown fuse and a circuit breaker tripped occurred.

A blown fuse may be discolored, hazy, or include melted or fractured metal. Remove the blown fuse while the main power is still turned off.

If your circuit breaker continues tripping, there's probably a problem with the circuit. A short circuit in one of the appliances or in the wiring might be the cause.

It's possible that the breaker is tripping due to a ground fault. A circuit overload is possible.

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Answer:

Lemon juice is your answer.

The distance traveled and the time it takes to travel are both going up at a steady rate. The distance goes from lap 1, lap 2, lap 3, lap 4. The time is increasing by a minute each time. When both the x and y scenario are increasing at a STEADY RATE the line will be linear. B displays a linear line.

Answer:

7.46 J/kg/K

Explanation:

The heat absorbed or lost is:

q = mCΔT

where m is the mass, C is the heat capacity, and ΔT is the change in temperature.

Given q = 15.0 J, m = 0.201 kg, and ΔT = 10.0 °C:

15.0 J = (0.201 kg) C (10.0 °C)

C = 7.46 J/kg/°C

Which is the same as 7.46 J/kg/K.

7.49 Can you help me since I help you

Its speed is zero at the beginning of the 3.25 s and 14 m/s at the end.

I'm thinking you probably wanted to find the car's acceleration.

Acceleration = (change in speed) / (time for the change)

Acceleration = (14 m/s) / (3.25 s)

Acceleration = 4.31 m/s²

The car's speed is 14.0 m/s; it had accelerated from 0 m/s over the course of 3.25 seconds.

The car, as described in your question, started at a speed of 0 m/s and in 3.25 s, it reached a speed of 14.0 m/s. This means the car's final speed or velocity is 14.0 m/s.

Let's add some context to help you understand. Acceleration is the pace at which an object changes its speed and is measured in m/s². In your case, the car starts from rest (0 m/s) and after 3.25 s, it attains a speed of 14.0 m/s. This implies that the car has been accelerating. Finally, it attains the speed of 14.0 m/s.

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Answer:

1) 2726.5 J/K      2) decrease                     3) 0

Explanation:

1)

change in entropy is given by [tex]\Delta s\:=\frac{Q}{T}[/tex]

here Q=mL where L is the latent heat of vaporization. therefore

[tex]Q=\frac{mL}{T}[/tex][tex]\Delta s\:=\frac{0.45X22.5X10^5}{100+273}=2726.5\:\:\frac{J}{K}[/tex]

2) [tex]\Delta S=\frac{-Q}{T}\:[/tex]

since the heat is taken from surroundings, the change in entropy is negative therefore entropy of surrounding will decrease.

3) since there is no heat exchange with universe  therefore , Q=0 in this case

[tex]\Delta S=\frac{Q}{T}\:=\frac{0}{T}=0[/tex]

To determine the entropy change of 0.45 kg of water turned into steam at 100°C, the specific heat of water, the heat of vaporization, and the temperature of the surroundings must be considered. Entropy changes of the water, surroundings, and the universe (which is zero in a reversible process) are calculated using thermodynamic equations involving heat transfer and temperature.

When 0.45 kg of water is changed by a reversible process to steam at 100°C, the calculation of entropy change involves considering the energy transfer and the temperature at which the process occurs. As this is a schoolwork question providing specific numerical answers would require more details about the temperatures of the surroundings and the specifics of the reversible process (e.g., at constant pressure or volume). However, we can discuss the general concepts applied to calculate these entropy changes:

To calculate these values in practice, you would apply the thermodynamic equation for entropy (ΔS = Q/T), where ΔS is the change in entropy, Q is the heat transfer, and T is the temperature in Kelvin.

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Answer:

Changing "Mass" to "Amount of electric charge"

"The correct change to correct the error in Badri's table is changing ""Mass"" to ""Amount of electric charge.""

To understand why this change is necessary, let's review the factors that affect the electric force between objects according to Coulomb's Law:

Coulomb's Law states that the electric force (F) between two point charges is directly proportional to the product of the magnitudes of the charges [tex](q_1 ~and~ q_2)[/tex], and inversely proportional to the square of the distance (r) between their centers. Mathematically, this is expressed as:

[tex]\[ F = k \frac{|q_1 q_2|}{r^2} \][/tex]

where k is Coulomb's constant[tex](\( 8.9875 \times 10^9 \) Nm^2/C^2).[/tex]

From Coulomb's Law, we can see that the electric force is affected by:

1. The amount of electric charge on each object [tex](q_1 ~and~ q_2)[/tex],: The force is directly proportional to the product of the charges, meaning that if the charge on either object increases, the force increases, and vice versa.

2. The distance between the charges (r): The force is inversely proportional to the square of the distance between the charges, meaning that as the distance increases, the force decreases, and as the distance decreases, the force increases.

Mass is not a factor in Coulomb's Law for electric force; it is a factor in Newton's Law of Universal Gravitation, which describes the gravitational force between two masses. Therefore, the table should reflect that the amount of electric charge has a direct relationship with the electric force, not mass.

The corrected table should look like this:

| Factor | Relationship to Electric Force |

|---------------|---------------------------------|

| Distance | Inverse |

| Amount of electric charge | Direct |

This correction aligns with the principles of Coulomb's Law and accurately reflects the factors that influence the electric force between objects."

Answer:

False

Explanation:

No they do not breathe through there skin. They breathe like any other animal or mammal for thet fact. Reptiles are not mammals. There's a reason why those two words are different.

The answer is a. true

Answer:

15 m/s

Explanation:

Initial momentum = final momentum

(25 kg) (15 m/s) + (25 kg) (0 m/s) = (25 kg) (0 m/s) + (25 kg) v

v = 15 m/s

Answer:

81.8 m/s

Explanation:

The initial velocity of the plane is:

[tex]v_0=115 m/s[/tex] (toward east)

So, decomposing along the x- and y- directions:

[tex]v_{x0} = 115 m/s\\v_{y0} = 0[/tex]

(we took east as positive x-direction and north as positive y-direction)

The acceleration is

[tex]a=2.88 m/s^2[/tex] (northwest, so the angle with the positive x-direction is 135 degrees)

Decomposing it along the two directions:

[tex]a_x = a cos 135^{\circ} = (2.88 m/s^2)(cos 135^{\circ})=-2.04 m/s^2\\a_y = a sin 135^{\circ} = (2.88 m/s^2)(sin 135^{\circ})=2.04 m/s^2[/tex]

So the two components of the velocity after a time t = 25.0 s will be

[tex]v_x = v_{x0} + a_x t = 115 m/s + (-2.04 m/s^2)(25.0 s)=64 m/s\\v_y = v_{y0} + a_y t = 0 m/s + (2.04 m/s^2)(25.0 s)=51 m/s[/tex]

So, the magnitude of the velocity of the plane will be

[tex]v=\sqrt[v_x^2+v_y^2}=\sqrt{(64 m/s)^2+(51 m/s)^2}=81.8 m/s[/tex]

Explanation:

The force of gravity that acts on a body is called weight [tex]W[/tex] and is defined as:

[tex]W=m.g[/tex]  (1)

Where:

[tex]m=100kg[/tex] is the mass of the box

[tex]g=9.8m/s^{2}[/tex] is the gravity at sea level

Substituting these values in (1):

[tex]W=(100kg)(9.8m/s^{2})[/tex]

[tex]W=980N[/tex]

Answer:

d

Explanation:

980

Answer:

27 m/s

Explanation:

Momentum is conserved.

Initial momentum = final momentum

(0.25 kg) v = (45 kg + 0.25 kg) (0.15 m/s)

v ≈ 27 m/s

Answer:

The Earth's axis is tilted from perpendicular to the plane of the ecliptic by 23.45°. This tilting is what gives us the four seasons of the year - spring, summer, autumn (fall) and winter. Since the axis is tilted, different parts of the globe are oriented towards the Sun at different times of the year.

Explanation:

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