A British Thermal Unit (BTU) is defined as the amount of energy required to raise the temperature of one pound of water by one degree Fahrenheit. Your family has a water heater that is rated for 30,000 BTUs and has a capacity of 500 pounds of water. What is the expected change in temperature of the water?

a. 140 F
b. 120 F
c. 90 F
d. 60 F
e. 30 F

The magnitude of the electric field produced by the rods at point P is 2.50 × 10^6 N/C, and the direction is away from the intersection point.

To find the magnitude and direction of the electric field at point P, which is 60.0 cm from each rod, we can use the principle of superposition. The electric field produced by each rod individually can be calculated, and then we can combine them vectorially to find the resultant electric field at point P.

Let's denote the positive charge-carrying rod as Rod A and the negative charge-carrying rod as Rod B.

Given:

Charge on Rod A (qA) = 2.50 μC = 2.50 × 10^(-6) C

Charge on Rod B (qB) = -2.50 μC = -2.50 × 10^(-6) C (negative sign indicates opposite charge)

The electric field produced by a uniformly charged rod at a point P at a distance x from the rod is given by:

E = (k * q) / (L * r)

where

k = Coulomb's constant (k = 8.99 × 10^9 N m^2/C^2)

q = charge on the rod

L = length of the rod

r = distance from the rod

Now, let's calculate the electric fields produced by each rod at point P:

For Rod A:

qA = 2.50 × 10^(-6) C

L = 1.20 m

rA = 0.60 m (since point P is equidistant from both rods)

Using the formula, we get:

EA = (k * qA) / (L * rA)

For Rod B:

qB = -2.50 × 10^(-6) C

L = 1.20 m

rB = 0.60 m (since point P is equidistant from both rods)

Using the formula, we get:

EB = (k * qB) / (L * rB)

Now, let's calculate the electric fields EA and EB:

EA = (8.99 × 10^9 N m^2/C^2 * 2.50 × 10^(-6) C) / (1.20 m * 0.60 m)

  ≈ 1.25 × 10^6 N/C

EB = (8.99 × 10^9 N m^2/C^2 * -2.50 × 10^(-6) C) / (1.20 m * 0.60 m)

  ≈ -1.25 × 10^6 N/C

Since the electric field is a vector quantity, we need to consider both the magnitude and direction. The electric field produced by Rod A is positive, pointing away from the rod, and the electric field produced by Rod B is negative, pointing towards the rod.

To find the resultant electric field at point P, we add the electric fields vectorially:

E = EA + EB

Magnitude of E = |EA| + |EB|

              = 1.25 × 10^6 N/C + 1.25 × 10^6 N/C

              = 2.50 × 10^6 N/C

Direction of E:

Since both electric fields are equal in magnitude and opposite in direction, the resultant electric field E will be along the bisector of the right angle formed by the two rods, pointing away from the intersection point.

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The fact that voyager travels in space is an example of Newton's First Law of Motion.

What are Newton's Laws of Motion?

Newton's laws of motion are three basic laws of classical mechanics that describe the relationship between the motion of an object and the forces acting on it. These laws can be paraphrased as follows:

When the voyager was launched, it was already moving forward in motion. So, because of the Newton's First law of motion the voyager remained in motion as there is no air friction present in the space to stop its motion.

Thus, this situation is an example of Newton's First law of motion.

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Answer:

C. electron

Explanation:

the magnetic field produces whenever an electric charge is in motion

The magnetic force of a material comes from the spinning of electrons. Electrons have a property called "spin" which is a type of intrinsic angular momentum. The correct option is E. electronr.

This spin generates a magnetic dipole moment, which causes the electron to act like a tiny magnet. When these magnetic dipoles are oriented in the same direction, they can create a macroscopic magnetic field, such as in the case of a magnet.

The behavior of these magnetic dipoles can be manipulated by external magnetic fields, leading to various magnetic phenomena.

Therefore, the spinning of electrons (option E) is responsible for the magnetic properties of materials.

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Answer:

The answer to your question is 2

The weight we experience on our planet is the product of our mass and acceleration due to gravity. This is the force by our own weight. if an object of 15 kg mass weighs 60 on planet X, acceleration due to gravity on planet X  will be  4 m/s².

Gravitational force is an attractive force by which an object attracts other objects into its center of mass. We are all standing on the surface of earth due to the gravitational pull of earth.

Gravitational force is directly proportional to the mass of the object and inversely proportional to the distance from the ground. Acceleration due to gravity is the acceleration of a moving body against the gravitational filed.

Given that the mass of the object is 15 Kg and the gravitational force or weight is 60 N. Then the acceleration due to gravity a is the ratio of its weight to the mass.

a = w/m

  = 60 N/ 15 Kg

  = 4 m/s².

Therefore, the acceleration due to gravity of the planet x is 4 m/s².

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Answer:

The balloon needs a vertical velocity of approximately 22.14 m/s to reach the window

Explanation:

The given parameters are;

The destination of the designed water balloon we shoot = The 3rd story window

The height of the 3rd story window which the water balloon should reach = 25 m

Therefore, we have, the equation of motion of the water balloon given as follows;

v² = u² - 2 × g × s

Where;

\(u_y\) = The initial vertical velocity of the balloon

\(v_y\) = The final vertical velocity of the balloon = 0 m/s

g = The acceleration due to gravity = 9.8 m/s

s = The height the balloon is intended reach at the final velocity becomes 0 m/s = The height of the 3rd story window

∴ s = 25 m

Substituting the values, we have;

0² = \(u_y\)² - 2 × 9.8 × 25

\(u_y\)² = 2 × 9.8 × 25 = 490

\(u_y\) = √490 = 7·√10

The initial vertical velocity of the balloon = \(u_y\) = 7·√10 m/s

Therefore, the balloon needs a vertical velocity of 7·√10 m/s which is approximately 22.14 m/s to reach the window.

Answer:

mercury

Explanation:

edge 2020

Answer:

E_{k2}=2660 [J] kinetic energy.

Explanation:

The energy in the initial state i.e. when the rollercoaster is at the top is equal to the energy in the final state i.e. when it is at the bottom of the hill.

These states can be represented by means of the second equation.

\(E_{k1}+E_{p1}=E_{k2}\\160 + 2500 = E_{k2}\\E_{k2}=2660 [J]\)

Since the rollercoaster is located in the bottom of the hill where the potential energy level is zero, therefore there is only kinetic energy in the second state.

Pure water can be made to boil at a temperature below 100°C by reducing the pressure on the surface of the water. This is achieved through a process known as vacuum distillation.

In a normal situation, water boils when its vapor pressure equals the atmospheric pressure above it. But at lower pressures, the vapor pressure of water is also lowered, causing it to boil at a lower temperature. By reducing the pressure above the surface of the water, pure water can be made to boil at temperatures lower than 100°C. This is the principle behind vacuum distillation, which is commonly used in chemical and industrial processes to purify liquids or extract desired compounds from them.

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The go-kart will travel approximately 444.3 meters during the given time period.

To determine the distance traveled by the go-kart during the given time period, we can use the equation:

\(\[ \text{{distance}} = \frac{1}{2} \cdot \text{{acceleration}} \cdot \text{{time}}^2 \]\)

Given:

Mass of the go-kart, \(\( m = 73.9 \)\) kg

Net force acting on the go-kart, \(\rm \( F = 90.2 \)\) N

Time period, \(\rm \( t = 38.0 \)\) s

First, we need to calculate the acceleration experienced by the go-kart using Newton's second law of motion: \(\rm \[ F = m \cdot a \]\)

Solving for acceleration:

\(\[ a = \frac{F}{m} \]\)

Substituting the given values:

\(\[ a = \frac{90.2 \, \text{N}}{73.9 \, \text{kg}} \]\)

Now, we can calculate the distance traveled:

\(\[ \text{{distance}} = \frac{1}{2} \cdot a \cdot t^2 \]\)

Substituting the values of \(\( a \)\) and \(\( t \)\):

\(\[ \text{{distance}} = \frac{1}{2} \cdot \left(\frac{90.2 \, \text{N}}{73.9 \, \text{kg}}\right) \cdot (38.0 \, \text{s})^2 \]\)

Calculating the result:

\(\[ \text{{distance}} \approx 444.3 \, \text{m} \]\)

Therefore, the go-kart will travel approximately 444.3 meters during the given time period.

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The ability of the lens to change its shape from flattened to round is known as accommodation. This process is essential for proper vision, as it allows the eye to adjust and focus on objects at varying distances.

The lens of the eye is normally flattened when viewing objects at a distance. However, when the eye needs to focus on something closer, the ciliary muscles surrounding the lens contract, causing it to become more rounded and curved. This change in shape increases the refractive power of the lens, allowing the eye to focus on the closer object.

Accommodation is an automatic process that occurs in a fraction of a second, allowing us to have clear vision at different distances without even thinking about it. However, as we age, the ability of the lens to change shape gradually decreases, leading to a condition known as presbyopia. This is why many people need reading glasses as they get older.

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Answer:

Kangaroo should be the answer.

Answer:

Kangaroo So there's your answer

Explanation:

Their numbers became so large that they destroyed crops and land, leading to soil erosion. They also negatively affected agriculture and plants by overgrazing. Not only did the rabbits wreak havoc on Australian croplands, but they also contributed to the decline of native plant and animal species.

Answer:

It has greater accuracy than other nondestructive methods in determining the depth of internal flaws and the thickness of parts with parallel surfaces.

Explanation:

Hope this helps you!

If the earth is moving anything we see which is stationary is not stationary, the given statement is true because everything in the universe is constantly in motion.

Even though an object appears to be still, it is actually moving relative to something else, usually the observer, this is because of the Earth's rotation around its axis, which makes everything on its surface, including people and objects, move with it. Therefore, the only way to measure the speed and direction of an object's motion is by comparing it to something else. For example, if you are standing still, an object moving past you will appear to be moving faster than if you were moving in the same direction as the object. This is because you are measuring its speed relative to your own motion.

In addition, the Earth's rotation also affects our perception of the night sky. It causes the stars to appear to move across the sky, even though they are actually stationary. This is because the Earth is rotating underneath them, making them appear to move. Therefore, the given statement is true because everything in the universe is constantly in motion, it is important to take into account the Earth's motion when measuring the speed and direction of an object's motion.

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A subtype discriminator is the attribute in the supertype entity that determines to which entity subtype each supertype occurrence is related. Option (a) is correct.

The entity supertype is a concept in a database schema that represents a group of entities that share the same attributes or characteristics. A subtype is a subset of entities that possess specific distinguishing characteristics or attributes that are not present in the supertype. A subtype will have at least one different attribute or relationship, apart from all of the characteristics that the supertype contains.

A subtype is a refinement of a supertype entity. An entity type, known as the supertype, has multiple subtypes that can be derived from it. Subtypes may be exclusive (disjoint) or nonexclusive (overlapping). Exclusive subtypes contain nonoverlapping entities, whereas nonexclusive subtypes have overlapping entities.

Supertype and subtype entities can be used in conjunction with the entity-relationship model. A subtype is a distinct entity that has one or more attributes that are specific to it but not present in its supertype. The subtype of an entity is said to be derived from its supertype by extension or specialization.

Therefore, option (a) is correct.

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The beam used is a negatively charged electron beam with a velocity of

v = E / B where E is the electric field and B is a magnetic field.

Now indicates that the electric field and the magnetic field are contracted and that the beam passes without deviating, so the electric and magnetic forces must be balanced

        Fe = Fm

        q * E = q * v * B

        v = E / B

this configuration is called speed selector.

The beam used is a negatively charged electron beam with a velocity of v = E / B.

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Although part of the question is missing the complete question is A depiction of a famous scientific experiment is given. Consider how the beam changes when the magnet is off compared to when the magnet is on. A bell-shaped evacuated glass tube with a narrow end and a wide end is connected to a battery at the narrow end. In the center of the tube there is a negatively charged plate above the tube, a positively charged plate below the tube, and a magnet with the field turned off. A beam originating at the narrow end of the tube travels toward the wide end of the tube. With the magnetic field turned off, the beam path bends toward the positively charged plate and ends at the lower half of the wide end of the tube. A bell-shaped evacuated glass tube with a narrow end and a wide end is connected to a battery at the narrow end. In the center of the tube there is a negatively charged plate above the tube, a positively charged plate below the tube, and a magnet with the field turned n. A beam originating at the narrow end of the tube travels toward the wide end of the tube. With the magnetic field turned on, the beam path travels in a straight path to the center of the wide end of the tube. What type of beam was used in this experiment?

The values of resistors R1 and R2 using the single-stage configuration circuit are 994.7 Ω and  3193.8 Ω respectively.

The single-stage configuration circuit is shown below:

We know that the formula for calculating the cut-off frequency is given by:

f_c = 1 / (2 * π * R * C) ---(1)

We also know that the value of the cut-off frequency is given by:

f_c = 1 / (2 * t) ---(2)

From the formula for cut-off frequency, equation (1), we can write as:

R = 1 / (2 * π * f_c * C) ---(3)

From equation (2), we can write as:

t = 1 / (2 * f_c) ---(4)

Substituting values given in the question, we have:

t = 1 / (2 * 1/50μs) = 25μs ---(5)

C = 80nF = 0.08μs ---(6)

R = 1 / (2 * π * f_c * C) = 1 / (2 * π * (1/2t) * C) = t / (π * C) ---(7)R = (25μs) / (π * 0.08μs)R = 994.7 Ω ---(8)

For R2, we know that the total capacitance of 6 stages is given by:

C_total = C * 6 + C_load = 80nF * 6 + 1000pF = 0.48μs + 1nF ---(9)

We know that the cut-off frequency for the 6-stage configuration circuit is given by:

f_c = 1 / (2 * π * R2 * C_total) ---(10)

Substituting equation (9) into equation (10), we get:

R2 = 1 / (2 * π * f_c * C_total) ---(11)

Substituting the values we get:

R2 = 3193.8 Ω ---(12)

Therefore, the values of resistors R1 and R2 using the single-stage configuration circuit are:

R1 = 994.7 Ω and R2 = 3193.8 Ω.

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Answer:

The coefficient of kinetic friction between the block and the surface is 0.127.

Explanation:

Given that,

The mass of a block, m = 4 kg

The acceleration of the block, a = -1.25 m/s²

We need to find the coefficient of kinetic friction between the block and the surface. The force of friction is given by :

\(F=\mu mg\\\\ma=\mu mg\\\\\mu=\dfrac{a}{g}\\\\\mu=\dfrac{1.25}{9.8}\\\\\mu=0.127\)

So, the coefficient of kinetic friction between the block and the surface is 0.127.

Hewan peliharaan, seperti ternak, memberi kita makanan, serat, dan kulit. Hewan liar, termasuk burung, ikan, serangga, dan penyerbuk, penting untuk mendukung jaring aktivitas dalam ekosistem yang berfungsi. Populasi tumbuhan dan hewan yang sehat sangat penting bagi kehidupan.

Yes, barium metal can be prepared from the electrolysis of its aqueous salt solution.

The process involves passing an electric current through a solution of barium chloride. The positively charged cations are attracted to the cathode and the negatively charged anions are attracted to the anode.

At the cathode, barium cations react with the electrons to form barium metal. At the anode, chlorine gas is produced from the anions. The barium metal produced is then collected at the cathode.

This process is known as electrolytic reduction and is used to produce a variety of metals, including barium. The electrolysis of barium salt solution is an effective and efficient method for producing barium metal.

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Answer:

Explanation:

I assume you meant to type t = √2h/g and you're referring to an object in free fall:  If so, here's my answer:

x = x₀ + v₀t + 1/2at²

for an object in free fall x - x₀ = h    (height the object falls)

v₀ = 0   (if the object starts at rest)

a = g

Therefore,

h = 1/2gt²

t² = 2h/g

t = √2h/g

Answer:

Resistance / Edge 2022

Explanation:

This is late, but just in case someone needs the answer. Hope this helps!

(*^▽^*)

Tungsten metal is used exclusively for making the filament of electric bulbs because it has a very high melting point

Tungsten metal is used exclusively for making the filament of electric bulbs because it has a very high melting point. Due to its high melting point, the tungsten filament can be kept white-hot without melting away

Tungsten wire is used as the filament in light bulbs. It glows white-hot as current passes through it.

Tungsten is used in light bulbs because its high resistivity converts electric energy into light and heat.

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Answer: it is incorrect because skepticism helps scientists recognize when ideas are not supported by evidence.

Explanation:

Skepticism is simply the understanding that there can be uncertainty when it comes to knowledge in certain areas.

From the question, we are informed that John doesn't think that skepticism should play an important role in the scientific process and that he says that skepticism interferes with scientific consensus.

The statement that best describes John's conclusion is that it is incorrect because skepticism helps scientists recognize when ideas are not supported by evidence.

Answer:

13 N

Explanation:

From the question,

If two forces act at right angle to each other, Their result force can be calculated using Pythagoras theorem.

R'² = R₁²+R₂²....................... Equation 1

Where R' = Resultant force, R₁ = First force, R₂ = Second force.

Given: R₁ = 12 N, R₂ = 5 N

Substitute these values into equation 1

R'² = 12²+5²

R'² = 144+25

R'² = 169

R' = \(\sqrt{169}\)

R' = 13 N.

Hence the resultant force is 13 N

Answer:

The experiments are not shown, so I will answer in a general way.

By the first Newton's law, an object will only change it's velocity if there is a net force different than zero acting on the object.

Then in the experiments (depending on the experiment), you can see different things.

If an object is not moving and you apply a force in it, the object will move.

If an object is moving and you apply a force in the opposite direction of it's motion, the motion will: decrease the speed, stop at all, or move in the opposite direction. Depending on the force that you apply.

An excellent experiment (but hard to do) is dropping an object from a really high place.

The gravitational force will pull down the object and the object will start to increase it's velocity.

But there is the air resistance, that opposes to this motion and increases with the speed of the object.

Then there is a given speed such that the air resistance force will be equal to the gravitational force, then we have a balanced force (the net force is zero) which means that the object will keep falling at a constant velocity.

Answer:

Explanation:

Since the fans are blowing in opposite directions, the net force stays the same and so does the velocity. (I wrote this and got it right)

Explanation:

avg spd = total distance/total time

=80/8=10m/s

If you push a refrigerator with a horizontal force of 100 n and move it a distance of 5 m while you are pushing, the work done is: 500 J

In physics we can say that work is the force applied to a body or object in order to move it from one point to another. In the international system of units, work is expressed as Joules.

To solve this problem, the formula and procedure we will use is:

W = F * x

Where:

Problem data:

Applying the work formula we get:

W = F * x

W = 100 N * 5 m

W = 500 J

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Answer:

5m

Explanation:

Using Pythagoras theorem,

a^2+ b^2=c^2

3^2+4^2=c^2

25=c^2

√(25)=c

5m=c

Answer:

The first one: 240 meters

The second one: 960 meters

Explanation:

The buoyant force in the increasing order is:

F<A<D<B<C=E

The buoyant force is an upward directed force that acts on any object when it is submerged either partially or completely inside a static fluid.

A body is able to float on the surface of fluid because of the buoyant force acting on the object, which tends to balance the weight of the object. The strength of the buoyant force on an object depends on the mass/volume of the fluid displaced by the object. This principle is known as Archimedes' Principle. According to Archimedes' principle, the buoyant force acting on an object is equal to the weight of the fluid displaced by the object.

The weight of an object is given by the equation:

W=mg

Here,

• m is the mass of the object.

• g=9.8m/s² =9.8m/s² is the acceleration due to gravity.

In terms of the volume, V and density ρ, the above equation becomes:

W=ρVg

It can be seen from the above equation that for a constant, ρ, we have:

W∝V

Therefore, the buoyant force will be proportional to the volume, Vf , of the fluid displaced by the object. Since the volume, Vf of the displaced fluid is equal to the volume of the object submerged inside the fluid, we have:

Vf = Vo∴Fb∝Vo

Therefore, the buoyant force in the increasing order is:

F<A<D<B<C=E

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The complete question is as follows: