The sound level at a distance of 3.00 m from a source is 120 dB. At what distance will the sound level be (a) 100 dB and (b) 10.0 dB

Answer:

Metal paper clips do not attract or repel each other. When an electromagnet is placed nearby, the paper clips can be observed to move toward it. Which statement describes this phenomenon?

- Magnetic domains within the paper clips align with the magnetic field.

An electromagnet is built using a 9-volt battery with conducting wire connected to a switch and coiled around an iron nail. A pile of metal paper clips is moved close to the iron nail, yet no attraction is apparent between the electromagnet and the paper clips. What is the most likely conclusion to explain this result?

- The switch is turned off.

An experiment modeled the interaction between magnetic force and the change of energy of an object influenced by the magnetic force. The experiment’s researchers observed that the metal wheels of a small car turned as they experienced the force exerted by a magnetic field, drawing the car closer to the magnet. What energy is being gained by the car?

- Kinetic Energy

Which statement about the current and magnetic field correctly describes this figure as well as all electromagnets?                                    

- The current generates and is perpendicular to the magnetic field.

Domains are the regions in a material in which the magnetic fields of many of the atoms are aligned facing the same direction. What is the relationship between the electrical current and the alignment of atoms responding to the current?

- As current increases, the alignment becomes more organized.

Explanation:

I just took the test and got a 4-5. I went back to look at the one I got wrong and got the answer so here are all answers to this quick check. Use this as help, don't use it just to cheat!!

Answer:  nriesberg31 above is correct :)

Explanation

Answer:light

Explanation:

Answer:

26 m/s

Explanation:

Kinetic energy = 1/2 * mass * velocity²

338kJ is 338000J.

338000 = 1/2 * 1000 * velocity²

676 = velocity²

26 m/s = velocity.

Answer:

It is a renewable resource as it renewably heats up water to a high temperature. Geothermal energy is more environmentally friendly than conventional fuel sources such as coal and other fossil fuels. In addition, the carbon footprint of a geothermal power plant is low.

Disadvantages: If dug deep underground, it can cause earthquakes. generates waste, reservoirs require proper management, it's location-specific, has high initial cost

According to Albert Einstein mass is a measure for body resistance to change its motion..

hop this helps you

mark me as brainliest

Answer:

Point number 3.

Explanation:

Volcanism can be studied to found out evidence of the internal structure of the Earth.

Answer:

Volcanism

Explanation:

Answer:

d

Explanation:

because ik igvddhh56yfdsaw66 u77rfgtd gyy f music nutren

Answer:

FJ = 31.48N

Explanation:

In this case you have that the torque exerted by each, thumb and finger, over the point P, is equal and opposite by the torque exerted by each Jaw.

You equal one of the torque produced by your hand, as for example, the torque of the finger, with the torque produced by one jaw:

\(\tau_F=\tau_J\\\\F_Fd_1=F_Jd_2\)         (1)

FF: finger force = 10.0N

FJ: jaw force = ?

d1: distance from finger to point P = 8.50cm = 0.085m

d2: distance form the border of the Jaws to the point P = 2.70cm = 0.027m

You solve the equation (1) for FJ and replace the values of the other parameters:

\(F_J=\frac{F_Fd_1}{d_2}=\frac{(10.0N)(0.0850m)}{0.027m}=31.48N\)

The force exerted by each jaw is 31.48N

The force that the forceps jaws exert on the plastic rod will be 31.48N.

From the information given, the following can be depicted:

Therefore, the jaw force will be calculated thus:

Fj = (Ff × d1) / d2

Fj = (10 × 0.085) / 0.027

Fj = 31.48N

Therefore, the jaw force is 31.48N.

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The weight of a sheet of aluminum that is 36" long, 24" wide, and thick would be 7.776 lbs.

We need to first find the volume of the aluminum sheet in cubic inches, and then use its density to calculate its weight.

The volume of the aluminum sheet can be calculated as:

V = l x w x h = 36 in x 24 in x 0.1 in = 86.4 cubic inches

where l is the length, w is the width, and h is the thickness of the sheet.

The density of aluminum is 0.090 lb/in^3, as given in the problem.

Therefore, the weight of the aluminum sheet can be calculated as:

W = V x density = 86.4 cubic inches x 0.090 lb/in^3 = 7.776 lbs

Therefore, the weight of the aluminum sheet is 7.776 lbs.

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Answer:

I belive is the answer is B. It is a material found in nature that people can use. Because water is technically a natural resource.

Answer:

Explanation:

Given

Velocity = 388m/s

Height S = 2.89m

Required

Time

Using the equation of motion

S =ut+1/2gt²

2.89 = 388t+1/2(9.8)t²

2.89 = 388t+4.9t²

Rearrange

4.9t²+388t-2.89 =0

Factorize

t = -388±√388²-4(4.9)(2.89)/2(4.9)

t= -388±√(388²-56.644)/9.8

t = -388±387.93/9.8

t =0.073/9.8

t = 0.00744 seconds

Answer:33.75m

Explanation: If you are throwing a rock down a cliff with a speed of 7.50m/s and it reached the ground in 4.50 seconds the height of the cliff will be 33.75m because 7.50m/s x 4.50s = 33.75

Answer:

(a). The speed of the airplane is 78.53 m/s.

(b). The centripetal acceleration 1.234 m/s².

Explanation:

Given that,

Radius = 5000 m

Time = 400 second

We need to calculate the speed of the airplane

Using formula of speed

\(v=\dfrac{d}{t}\)

\(v= \dfrac{2\pi r}{t}\)

Put the value into the formula

\(v=\dfrac{2\times\pi\times5000}{400}\)

\(v=78.53\ m/s\)

We need to calculate the centripetal acceleration

Using formula formula

\(a=\dfrac{v^2}{r}\)

Put the value into the formula

\(a=\dfrac{78.53^2}{5000}\)

\(a=1.234\ m/s^2\)

Hence, (a). The speed of the airplane is 78.53 m/s.

(b). The centripetal acceleration 1.234 m/s².

Explanation:

The Answer is B.I think so may be it's wrong so kindly get any confirmation from your teacher about this

The final velocity for object a is 5.6 m/s in the opposite direction.

From the conservation of momentum, we know that the collision between two objects will result in the conservation of initial momentum and the final momentum i.e.,

                                    Pi  =  Pf

It is given that,

                      m₁ = 1.5 kg

                       u₁ = 11.2 m/s

                       m₂= 4.5 kg

                        u₂= 0

                         v₂= 5.6 m/s

We need to find v₁.

              Using momentum conservation

               m₁ u₁ + m₂ u₂ =  m₁ v₁ + m₂ v₂

               1.5 × 11.2 + 4.5 × 0 =  1.5 × v₁ + 4.5 × 5.6

                                   16.8 + 0 =  1.5 × v₁ +  25.2

                                  -8.4/ 1.5  =  v₁

                                    v₁ = - 5.6 m/s

Here, the negative sign shows that body is moving in the opposite direction.

Hence, option (d) is correct.

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Answer:

Infrared thermometers employ a lens to focus the infrared light emitting from the object onto a detector known as a thermopile. The thermopile is nothing but thermocouples connected in series or parallel. When the infrared radiation falls on the thermopile surface, it gets absorbed and converts into heat.

Answer:(:

Explanation:

discovered alpha and beta rays, and proposed the laws of radioactive decay.

The maximum height the spherical mass can reach is 30.1 meters. The maximum height the spherical mass can obtain at the extremes of its swing can be calculated using the conservation of energy principle.

A simple pendulum with a length of 10.2 m and a mass of 8.5 kg swings with a maximum velocity of 7.8 m/s. To find the maximum height at the extremes of its swing, we can use conservation of mechanical energy. At the lowest point, all energy is kinetic, while at the highest point, all energy is potential. Equating these energies, we have:

(1/2) * m * v^2 = m * g * h

where m = 8.5 kg, v = 7.8 m/s, g ≈ 9.81 m/s^2, and h is the maximum height. Solving for h, we get:

h = (v^2) / (2 * g) ≈ (7.8^2) / (2 * 9.81) ≈ 3.12 m

Thus, the maximum height the spherical mass can reach is approximately 3.12 meters.

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If the pressure in the pipe is 8940 n/m° and in the constricted section is 6705 n/m,  the rate at which oil is flowing through the pipe is 2.74 m^3/s.

The volume flow rate (Q) can be expressed as:

Q = Av

We can use the continuity equation to relate the velocities at the two different cross-sectional areas:

A1v1 = A2v2

Where:A1 and A2 are the cross-sectional areas at the two different points in the pipe

v1 and v2 are the fluid velocities at the two different points in the pipe

We can rearrange this equation to solve for v1 in terms of v2:

v1 = (A2/A1) * v2

Now we can use Bernoulli's equation to relate the pressure and velocity at the two different points in the pipe:

P1 + (1/2)ρv1^2 = P2 + (1/2)ρv2^2

We can rearrange this equation to solve for v2:

v2 = sqrt(2(P1 - P2) / ρ + v1^2)

Now we can plug in the given values to find v2:

v1 = ?

A1 = (π/4)(0.945 m)^2 = 0.664 m^2

A2 = (π/4)(0.567 m)^2 = 0.100 m^2

ρ = 821 kg/m^3

P1 = 8940 N/m^2

P2 = 6705 N/m^2

v2 = sqrt(2(8940 - 6705) / 821 + ((0.100/0.664) * v1)^2)

We can simplify this equation by assuming that the velocity at the wider section of the pipe (v1) is much smaller than the velocity at the constriction (v2), due to the principle of continuity. Therefore, we can neglect the second term in the equation, giving:

v2 = sqrt(2(8940 - 6705) / 821) = 11.98 m/s

Now we can use the continuity equation to find the volume flow rate:

Q = A1v1 = A2v2 = (π/4)(0.945 m)^2 * 11.98 m/s =2.74 m^3/s

Therefore, the rate at which oil is flowing through the pipe is 2.74 m^3/s.

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The power steering pressure switch is an essential component for ensuring the safety and reliability of the vehicle.

The component that signals the computer in this scenario is known as the power steering pressure switch. It is a small sensor that is located within the power steering system of the vehicle.

When the power steering pressure increases, such as during a turn at low speed, the switch will detect this change and send a signal to the computer.

This signal will then prompt the computer to increase the idle speed of the engine, which helps prevent stalling. This process is designed to ensure that the engine continues to run smoothly even when the power steering system places additional demands on it.

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Answer:

0.389 meters per second

Explanation:

1. Get your knowns

a. 40 meters per 120 seconds

b. 30 meters per 60 seconds

2. Add

Total distance = 40 meters + 30 meters = 70 meters

Total time = 120 seconds + 60 seconds = 180 seconds

3. Divide

Average velocity = 70 meters / 180 seconds

= 7 meters / 18 seconds

= 0.388... meters per second

Lines L1, L2, and L3 are skew (they do not intersect and do not lie in parallel planes). The distance between L1 and L2 is 3 units.

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Gravitational potential energy is converted to kinetic (Motion) energy when the object begins to move.

The energy gained from this change in position is stored within the body as gravitational potential energy if a ball is raised from the ground to a height above the earth. The gravitational potential energy is then converted into kinetic energy when the ball hits the earth.

Therefore, the way an object falls, its gravitational potential energy is said to be transformed or altered  into the kinetic energy of motion.

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Answer:i think 20km

Explanation:

Answer:

when all forces acting on an object remain the same

None of the choices is correct.

Equilibrium is the condition when all forces acting on an object are balanced. Then, the object doesn't accelerate.  It continues in constant, uniform motion. It moves at a constant speed (which may be zero), and in a straight line.

The frequency of the generator in the uniform magnetic field is determined as 7.1 Hz.

The frequency of the generator is calculated by applying the following formulas as follows;

emf (max) = NBAω

where;

The angular frequency is given as;

ω = 2πf

where;

Our new equation becomes;

emf (max) = 2NBAπf

f = ( emf ) / ( 2NBAπ)

The frequency of the generator is calculated as follows;

f = ( 8 ) / ( 2 x 200 x 0.03 x 0.03 x π )

f = 7.1 Hz

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An operating lamp draws a current of 0. 50 ampere. the amount of charge passing through the lamp in 10 seconds is 5.00 Coulombs.

The amount of charge (Q) passing through a conductor is given by the product of current (I) and time (t):

Q = I * t

In this problem, we are given the following information:

The current passing through the lamp is I = 0.50 A

The time for which the current flows is t = 10 s

Using the above formula, we can calculate the amount of charge passing through the lamp as:

Q = I * t

Q = 0.50 A * 10 s

Q = 5.00 C

Thus, the amount of charge is 5.00 Coulombs.

The ampere, often shortened to amp, is the unit of electric current in the International System of Units.Ampere meter, commonly known as Ammeter is an electrical instrument used to measure electrical current in Amperes.

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Answer:

⁸

Explanation:

electric potential

I think so

Answer:

Electrical conductors