What is the current (Amps) of a circuit with a 9V battery and a 18Ω lamp?

Answer:

Magnets create a field of influence that

attracts or repels magnetic objects.

Explanation:

Hope it helps :)

Answer: The magnet has a magnetic field that either attracts or repels another magnet or magnetic metal. It is because of this magnetic field that things move.

Explanation: N/A

Answer:

23 m/s

Explanation:

One factor that the pupils should keep the same during their investigation is the concentration of the lemon juice or the acidity level.

The factor that the pupils should keep the same in their investigation is the size and type of lemon used. The acidity and moisture content of the lemon can affect the conductivity and voltage produced by the cell.  

To ensure a fair comparison and accurate results, it is important to use lemons of the same type and size for each pair of metals tested. By keeping the lemon constant, the pupils can isolate the effect of the different pairs of metals on the voltage produced by the cell.

This allows them to accurately determine which pair of metals generates the highest voltage. If they were to use lemons of varying sizes or acidity levels, it would introduce an additional variable that could influence the voltage readings and confound the results.

Therefore, by controlling and keeping the lemon constant, the pupils can focus on comparing the voltage produced by different pairs of metals and make a more accurate assessment of which pair generates the biggest voltage in the electric cell.

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Answer:

Explanation:

Radius of the charged sphere (R)=12cm

Charge (q)=6∗10^−6C

Electric field intensity (E)=?

i) On the surface

\(E=\frac{1}{4\pix_{e0} } \frac{q}{R^2} =9*10^{9} *\frac{6*10^{-6} }{0.12^-2} =3.75*10^6 N/C\)

ii) Inside the sphere,

E=0;  Because charge enclosed by Gaussian surface is zero.

iii) Outside the sphere at distance 15cm

i.e. r=12+15=27cm=0.27m

\(E=\frac{1}{4\pi _{e} }_{0} \frac{q}{r^{2} } =9*10^9*\frac{6 \a* *10^6}{(0.27)^2} =7.41*10^5 N/C\)

A battery is an electrochemical device that generates electricity from a chemical reaction. It typically consists of two electrodes, an anode and a cathode, separated by an electrolyte, which is a solution or medium that conducts ions.

The chemical reaction between the electrodes and the electrolyte generates a flow of electrons, which can be harnessed to power electrical devices.The flow of electrons generated by the chemical reaction in a battery is a one-way process and cannot be reversed. When the battery is connected to a circuit, the electrons flow from the anode to the cathode, producing an electrical current.

However, the reverse flow of electrons, from the cathode to the anode, cannot be achieved by simply reversing the direction of the current. This is because the chemical reaction that generates the flow of electrons is not reversible.Different types of batteries use different chemical reactions to generate electricity. For example, alkaline batteries use zinc as the anode and manganese dioxide as the cathode, while lead-acid batteries use lead as the anode and cathode and sulfuric acid as the electrolyte.

Lithium-ion batteries, which are commonly used in portable electronic devices, use lithium ions as the charge carriers and graphite as the anode.In conclusion, a battery is an electrochemical device that generates electricity from a chemical reaction and cannot be run in reverse. The chemical reaction is a one-way process that generates a flow of electrons from the anode to the cathode, producing an electrical current that can be used to power electrical devices.

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Answer:

Summarize any difficulties or problems you had in performing the experiment that might have affected the results. Describe how you might change the procedure to avoid these problems.

Explanation:

This is what your experiment was intended to demonstrate or investigate. "As temperature rises, honey's viscosity falls."

The experiment appears to investigate the relationship between honey viscosity and temperature, and after reading the question.

You must look at your experimental results here; it's likely that you discovered that viscosity does indeed drop as the temperature rises.

The final task at hand is to list the challenges and issues you encountered throughout the experiment and make suggestions for how to address them in order to conduct future experiments that are more successful.

Therefore, the temperature has a considerable influence on viscosity, however, the particular substance also affects this relationship.

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The NEC recommends that voltage drops on branch circuits not exceeding 3% at the farthest outlet of power, for heating or lighting loads, will provide for reasonable efficiency of operation.

NEC stands for National Electrical Code. It is the standard for electrical design, installation, inspection, and safety in the United States. The NEC is a model code that has been adopted by many local governments as law.Regarding the question, the NEC recommends that voltage drops on branch circuits not exceeding 3% at the farthest outlet of power for heating or lighting loads. This will provide for reasonable efficiency of operation.In other words, a 3% voltage drop is considered as an appropriate voltage drop limit for branch circuits that supply power to lighting and heating loads. If the voltage drop limit exceeds 3%, it can cause flickering of the lights and/or heating elements not working correctly. So, if the voltage drop is kept below 3%, it will ensure reasonable efficiency of operation.

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Answer:

no

Explanation:

ans should be correct

Answer:

Left

Explanation:

The force is applied opposite of the acceleration.

The 850 kg car will reach a speed of 15 m/s in 0.939 seconds.

When a force is applied to a stationary object, it starts to move. The acceleration is a direct function of the force applied to it, and the mass of the object determines the amount of force needed to move it at a given acceleration rate. The required force is expressed in watts when we calculate the rate of work done or energy produced in a certain amount of time. The amount of useful work produced is referred to as the output of a machine. This power output formula is stated as:

Output = Work done / Time

We can determine the time taken to achieve the velocity of a vehicle using the formula:

v = u + at where: u = initial velocity of the vehicle, v = final velocity of the vehicle, a = acceleration of the vehicle, t = time taken to achieve the velocity,

To compute the time taken to reach a speed of 15 m/s for an 850 kg vehicle with a useful power output of 29,840 watts, ignoring friction, we use the following equation:

29,840 = (1/2) × 850 × v² / t

v = 15 m/s

850 × v² / t = 2 × 29,840

t = 850 × v² / (2 × 29,840) = 0.939 s

Therefore, the 850 kg car will reach a speed of 15 m/s in 0.939 seconds.

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The manager should get in touch with the local regulatory authorities before using if a broken water main has made the water in a business appear brown.

The amniotic sac, a fluid-filled membranous sac, surrounds and protects your baby during pregnancy. Your membranes will typically burst, commonly known as your water breaking, during the start or during labor. If you

If your baby is premature, they can survive for weeks with the right monitoring and care, usually inside a hospital setting. Current research indicates that it might be safe to wait 48 hours (and occasionally longer) for labor to start naturally when your baby is now at least 37 weeks old.

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The board's displacement during the acceleration time after the sailboard was hit by the gust is 32.9 m.

The magnitude of the board's displacement can be calculated with the following equation:

\(x_{f} = x_{i} + v_{i}t + \frac{1}{2}at^{2}\)

Where:

\( x_{f} \): is the final displacement =?

\( x_{i} \): is the initial displacement = 0

\(v_{i}\): is the initial velocity  

t: is the time = 5.42 s

a: is the acceleration = 0.714 m/s²  

Since the hits the sailboard at 48.8° from the original direction, the initial velocity is:  

\(v_{i} = v*cos(\theta) = 6.28 m/s*cos(48.8) = 4.14 m/s\)

Hence, the displacement is:

\(x_{f} = v_{i}t + \frac{1}{2}at^{2} = 4.14 m/s*5.42 s + \frac{1}{2}0.714 m/s^{2}*(5.42 s)^{2} = 32.9 m\)

Therefore, the magnitude of the board's displacement is 32.9 m.

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Answer:

The combined gas law states that the pressure of a gas is inversely related to the volume and directly related to the temperature. If temperature is held constant, the equation is reduced to Boyle's law. Therefore, if you decrease the pressure of a fixed amount of gas, its volume will increase.

Explanation:

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The energy stored in each capacitor is 49.975 J.

When two identical 1.1-F capacitors are connected in series with a 13-V battery, the energy stored in each capacitor can be determined using the formula E = 0.5CV². In this equation, E represents the energy stored in the capacitor, C is the capacitance of the capacitor, and V is the voltage across the capacitor.

To calculate the energy stored in each capacitor, follow these steps:

Determine the equivalent capacitance (Ceq) of the two capacitors in series.

Ceq = C/2

Given: C = 1.1 F (capacitance of each capacitor)

Ceq = 1.1/2 = 0.55 F

Apply the formula E = 0.5CV² to find the energy stored in each capacitor.

E = 0.5 x 0.55 F x (13 V)²

E = 0.5 x 0.55 F x 169 V²

E ≈ 49.975 J

Therefore, the energy stored in each capacitor is approximately 49.975 J.

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Answer:

Albert Einstein was from Germany he was born theoritical physicist, from childhood only he loved mechanical toys, he was highly gifted in Mathematics, He was a world citizen and a scientific genius too. His contribution were:

1) he developed the theory of relativity

2) he also discovered the process of nuclear fission

3)he developed the quantum theory of specific heat

4)theory of stimulated emission, on which laser device technology is based

5) law of photoelectric effect

hope it helped you :)

Explanation:

The force between two charges is given by :

\(F=\dfrac{kq_1q_2}{r^2}\)

k is electrostatic constant

r is distance between charges

The force between charges is directly proportional to the product of charges and inversely proportional to the square of the distance between them.  

The voltage of the circuit will be 0.75 V.The potential difference between the circuit is known as the voltage.

Ohm's law claims that the voltage across a conductor is directly proportional to the current flowing through it.

This current-voltage connection may be expressed mathematically as,

The Equation of Ohm's Law

\(\rm V=IR \\\\ V= 0.05 \times 15.2 \\\\\ \rm V=0.75 \ V\)

The voltage of the circuit will be 0.75 V.

Hence option D is correct.

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The life expectancy of the given stars are:a) 0.2-solar mass, 0.01-solar luminosity red dwarf: 10 trillion yearsb) 3-solar mass, 30-solar luminosity star: 10 million yearsc) 10-solar mass, 1000-solar luminosity star: 10 million years.

The life expectancy of a star is determined by its mass and luminosity. The more massive and luminous the star is, the shorter its life expectancy is. Hence, using this information, we can estimate the life expectancy of the following stars:a) 0.2-solar mass, 0.01-solar luminosity red dwarfRed dwarfs are known to have the longest life expectancies among all types of stars. They can live for trillions of years.

Hence, a 0.2-solar mass, 0.01-solar luminosity red dwarf is expected to have a much longer life expectancy than the Sun. It could live for up to 10 trillion years or more.b) 3-solar mass, 30-solar luminosity starA 3-solar mass, 30-solar luminosity star is much more massive and luminous than the Sun. As a result, it will have a much shorter life expectancy than the Sun.

Based on its mass and luminosity, it is estimated to have a lifetime of around 10 million years.c) 10-solar mass, 1000-solar luminosity starA 10-solar mass, 1000-solar luminosity star is extremely massive and luminous. It will burn through its fuel much faster than the Sun, resulting in a much shorter life expectancy. Based on its mass and luminosity, it is estimated to have a lifetime of only around 10 million years as well.

Therefore, the life expectancy of the given stars are:a) 0.2-solar mass, 0.01-solar luminosity red dwarf: 10 trillion yearsb) 3-solar mass, 30-solar luminosity star: 10 million yearsc) 10-solar mass, 1000-solar luminosity star: 10 million years.

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A 0.5 mass is attached to a horizontal spring which undergoes SHM. The graph of EPE as a function of position for the system is shown below.

As we know, the restoring force of a spring is given by F = -kx Where F is the restoring force of the spring k is the force constant of the spring x is the displacement from the equilibrium position hence, the force constant of the spring can be calculated as follows; We know that the potential energy (EPE) stored in a spring is given by EPE = (1/2)kx²From the given graph, we can see that at x = 0.1 m, EPE = 0.5 JNow substituting the given values in the above equation, we get0.5 = (1/2)k(0.1)²k = 100 J/mHence, the force constant of the spring is 100 J/m.
A 0.5 kg mass is attached to a horizontal spring undergoing Simple Harmonic Motion (SHM). The graph of Elastic Potential Energy (EPE) as a function of time will show a sinusoidal pattern, indicating the continuous transfer of energy between kinetic and potential energy during the motion of the mass and spring.

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The focal length of the glasses needed is 18.04cm.

1) To determine the focal length (f) of the glasses needed when they are 2 cm away from her eyes, we can use the lens equation:

1/f = 1/do + 1/di

Where do is the object distance (25 cm), di is the image distance (60 cm - 2 cm = 58 cm). Plugging in the values:

1/f2cm = 1/25 + 1/58
f2cm = 1/(1/25 + 1/58) ≈ 18.04 cm

2) For the glasses that are 3 cm away from her eyes, di will be 60 cm - 3 cm = 57 cm. Using the lens equation:

1/f3cm = 1/25 + 1/57
f3cm = 1/(1/25 + 1/57) ≈ 17.32 cm

3) To find the focal length of the contact lenses needed for a nearsighted person, we need to use the lens equation:

1/f = 1/do + 1/di

Since he wants to see objects at a great distance (infinity), the image distance (di) will be at his farpoint. For the left eye, the farpoint is 482 cm, and the object is at infinity (do = ∞). Plugging in the values:

1/fleft = 1/∞ + 1/482
fleft = 1/(0 + 1/482) ≈ -482 cm

4) For the right eye, the farpoint is 632 cm. Using the lens equation:

1/fright = 1/∞ + 1/632
fright = 1/(0 + 1/632) ≈ -632 cm

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Given data

*The given mass of the car is m = 1610 kg

*The given effective force constant is k = 5.75 × 10^4 N/m

(a)

The formula for the period of oscillation of a 1610 kg car is given as

Substitute the known values in the above expression as

Hence, the time period of oscillation of a 1610 kg car is T = 1.05 s

(b)

As from the given data, the amplitude of the oscillation of the car decreases by a factor of 5.00. Then, the expression for the amplitude of the oscillation, and the damping constant (b) is calculated as

Substitute the known values in the above expression as

Hence, the damping constant is b = 9871.2 kg/s

Answer:

depends if it is wireless

Explanation:

if not a socket in a wall or surface. if not then it will probably use batteries.

The change in the momentum of the bullet can be expressed as,

Finally, the bullet moves in the opposite direction therefore, final velocity is taken as negative.

Plug in the known values,

Thus, the change in the momentum of bullet is 12.1 kgm/s.

Answer:

D

Explanation:

Cool air sinks because it's denser and warm rises because it's less dense.

This is the principle you have in your air conditioning.

As the air is cooled it keeps falling that's why it's necessary to tilt the vents of of an AC at 45° so that the cold air would be well circulated.

to get weight multiply Mass by 9.8

weight =9.8x15=147N

Answer:

Transformers use “electrical steel” alloys. ... From 1% to 6.5% silicon is added, as well as a small amount (up to 0.5%) of manganese and aluminum to reduce brittleness in alloys with higher percentages of silicon. Electrical steels are formulated and processed to have low hysteresis and eddy-current losses.

Explanation:

The eddy currents consume energy and heat the iron core. The designers of the electrical machines and transformers laminate the core with thin sheets of iron coated with a thin oxide layer.

To reduce Eddy current loss in the transformer, the iron core is constructed of laminated silicon steel and has a unique insulated coating.

Instead of employing a solid iron block, this can be accomplished by laminating the core, which is constructed from a collection of metal plates that are adhered together.

With less current flow, efficiency loss, and heat waste, this has the desired effect of raising electrical resistance inside the core. Low hysteresis and eddy-current losses are achieved by the formulation and processing of electrical steels.

The iron core is heated by the eddy currents, which use energy. The core of electrical devices and transformers is laminated with thin sheets of iron covered in a thin oxide layer by the designers.

Therefore, Transformers use alloys known as “electrical steel.” To lessen brittleness in alloys with larger percentages of silicon, between 1% and 6.5% silicon is added, along with a tiny amount (up to 0.5%) of manganese and aluminum.

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Answer:

The kinetic energy of the white car will increase, while that of the yellow car will reduce

Explanation:

According to Newton's law of motion, a body will be a rest or uniform motion unless acted upon by an external force

Since the white car is moving at 5km/h west and another car moving at 10km/h west the kinetic energy possessed by the white car will increase because the other car is moving along the Same direction with it

The expression kinetic energy is

KE= 1/2mv²

Explanation:

the PE = Weight x g x Height above ground where g is the gravitational constant (9.8m/s^2)

so tge PE = 100 x 9.8 x 25 = 24500 J

The correct answer is a. buoys.

Buoys are floating devices that are used to measure the height of waves.

They are typically anchored to the seabed, and they have a sensor that measures the height of the waves as they pass by. This information is then transmitted to a central location, where it can be used to track the movement of waves and to predict their behavior. Buoys are an important tool for monitoring the ocean and for predicting the weather. They are also used to warn ships of dangerous conditions at sea. Buoys are floating devices that are used to measure the height of waves. They are typically anchored to the seabed, and they have a sensor that measures the height of the waves as they pass by. This information is then transmitted to a central location, where it can be used to track the movement of waves and to predict their behavior. Buoys are an important part of the global network of ocean observing systems. They provide valuable data that is used to track the movement of waves, to predict the weather, and to warn ships of dangerous conditions at sea.

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