In the diagram shown above, the circles represent small balls that have
electric charges. Ball 1 has a negative charge, and ball 2 is repelled by ball 1
Next, you see that ball 2 repels ball 3 and that ball 3 attracts ball 4. What is
the electric charge on ball 4?
Ball 4 may have either a positive or negative charge,
Ball 4 has a negative charge.
Ball 4 has a positive charge.

Answer:

1

Explanation:

hydrogen has one electron therefor only being able to bond with one other

The final temperature of the water after all the ice melts is approximately 8.6 °C.

Heat = mass × specific heat × temperature change

Heat of fusion = mass × heat of fusion

Heat of vaporization = mass × heat of vaporization

Let's solve each problem step by step:

A total of 645 cal of heat is added to 5.00 g of ice at -20.0 °C. What is the final temperature of the water?

a) Heat required to raise the temperature of ice to 0 °C:

Heat = 5.00 g × 0.5 cal/g°C × (0 °C - (-20.0 °C)) = 100 cal

b) Heat required to melt the ice at 0 °C:

Heat = 5.00 g × 80 cal/g = 400 cal

c) Heat required to raise the temperature of water from 0 °C to the final temperature:

Heat = 5.00 g × 1 cal/g°C × (T final - 0 °C)

Now, let's add up the heats from each step:

Total heat = 100 cal + 400 cal + 5.00 g × (T final - 0 °C) cal

We know that the total heat added is 645 cal:

645 cal = 500 cal + 5.00 g × (T final - 0 °C) cal

Simplifying the equation:

5.00 g × (T final - 0 °C) = 145 cal

Solving for T final:

T final = (145 cal / 5.00 g) + 0 °C = 29.0 °C

Therefore, the final temperature of the water is 29.0 °C.

Two 20.0 g ice cubes at -12.0 °C are placed into 225 g of water at 25.0 °C. Calculate the final temperature, T f, of the water after all the ice melts.

a) Heat required to raise the temperature of ice to 0 °C:

Heat = 2 × 20.0 g × 0.5 cal/g°C × (0 °C - (-12.0 °C)) = 480 cal

b) Heat required to melt the ice at 0 °C:

Heat = 2 × 20.0 g × 80 cal/g = 3200 cal

c) Heat required to raise the temperature of water from 25.0 °C to the final temperature:

Heat = 225 g × 1 cal/g°C × (T f - 25.0 °C)

Now, let's add up the heats from each step:

Total heat = 480 cal + 3200 cal + 225 g × (T f - 25.0 °C) cal

We know that the total heat added is 0 cal (no energy transferred to or from the surroundings):

0 cal = 3680 cal + 225 g × (T f - 25.0 °C) cal

Simplifying the equation:

225 g × (T f - 25.0 °C) = -3680 cal

Solving for T f:

T f = (-3680 cal / 225 g) + 25.0 °C ≈ 8.6 °C

Therefore, the final temperature of the water after all the ice melts is approximately 8.6 °C.

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Answer:

volume = 30cm^3

Explanation:

When crystals are pressed along their axis of symmetry, an electric charge is generated. This phenomenon is known as the piezoelectric effect.  

The piezoelectric effect was discovered by Pierre and Jacques Curie, who were French physicists. Piezoelectricity is the property of some materials to generate an electric charge in response to applied mechanical stress.

The charge generated by the piezoelectric effect is proportional to the amount of pressure applied to the crystal, as well as the strength of the crystal. The piezoelectric effect is used in a variety of applications, including microphones, speakers, and sensors.

In microphones and speakers, piezoelectric crystals convert sound waves into an electrical signal or vice versa. In sensors, the piezoelectric effect is used to measure pressure, acceleration, and strain. The piezoelectric effect is also used in medical applications, such as ultrasound technology.

Ultrasound imaging works by transmitting sound waves through the body and measuring the echoes that bounce back. The piezoelectric effect is used to generate and detect these sound waves.

In conclusion, the piezoelectric effect is a fascinating phenomenon that has a wide range of practical applications. It was discovered by Pierre and Jacques Curie in the late 19th century and has since been used in a variety of fields.

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Answer: 2.

Explanation:

The Swedish botanist Carl Linnaeus is regarded as the founder of the current system of taxonomy, as he developed a ranked system known as Linnaean taxonomy for categorizing organisms and binominal nomenclature for naming organisms.

Answer:

Carolus Linnaeus

Explanation:

All modern classification systems have their roots in the Linnaean classification system. It was developed by Swedish botanist Carolus Linnaeus in the 1700s. He tried to classify all living things that were known at his time.

Answer:

infinity

Explanation:

this is because time is irrelevant

Answer:

See below

Explanation:

Things generally expand when heated ....so volume increases while mass remains the same .....this will cause the value of density to decrease  

COPPER

Because, copper

is just one of the more popular materials that is used for conductors

An inductor always resists any change in the current through it. The correct statement about inductors is D.


This is due to the property of inductance, which is the ability of an inductor to generate a voltage that opposes any change in the current through it. This is described by Faraday's law of electromagnetic induction. As a result, inductors are commonly used in circuits to smooth out changes in current, and also to filter out high-frequency signals.

Option A is incorrect because inductors store energy in a magnetic field, not by building up charge. Option B is incorrect because an inductor allows current to flow through it, but opposes changes in the current. Option C is incorrect because the current in the circuit will eventually become steady, but not zero. Hence option D is correct.

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The experiment or investigation to find out how much a lamp affects the temperature of the surrounding in 5 minutes is given as follows. Note that an Infra Red Lamp will be used as the source of thermal energy.

An experiment is a technique that is carried out to support or deny a hypothesis, or to test the efficacy or probability of something that has never been done before. Experiments shed light on cause-and-effect relationships by revealing what happens when a certain element is changed.

An experiment is a quantitative technique that arbitrates conflicting models or hypotheses in the scientific method. Experimentation is often used by researchers to validate or invalidate current ideas or assumptions.

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Based on the context provided, the correct meaning of the underlined word "mischievous" is d) in a sneaky way. Hence, option d) is the correct answer.

This is because the sentence describes the person's eyes having a "glint" when he pulls a pop quiz and makes all the multiple choice answers, which suggests that he may be doing it in a playful or mischievous manner. The word "mischievous" is often used to describe behavior that is playful or teasing, but can also be seen as sneaky or sly.

The correct meaning of the underlined word "mischievous" in the given sentence is: d. in a sneaky way.

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Answer:

B small positive charge

Explanation:

Answer: The ability to do work.

Explanation: Scientists define energy as the ability to do work. There is potential energy (where an object at rest has the capacity to have motion) and kinetic energy (where an object is in motion).

Answer:

7500

Explanation:

multiply the mass / volume value by 1000

The characteristics of the electric fields that have variable strength with the voltage suppressed allow us to find how a pattern is formed and how two signals can be synchronized in the oscilloscope.

     1) The pattern is a copy of the voltage pattern applied to the plates

    2) The Stacionary pattern is adidition of the signal to be measured and a perpendicular saw signal synchronized, .

1)  The electric field is an area of ​​space where there is an electric force, in this area any electric charge that enters undergoes a Coulomb force.

                F = q E

Where F is the force, q the charge and E the electric field.

The electric field created by two parallel deflection plates is uniform and moves an electric charge. If the voltage of the plates is controlled, the position of the charges can be controlled when they reach the screen, in general the screens are fluorescent, the emission time is long. As we move the voltage we will see a pattern determined by the pattern of the voltage change.

2)  An oscilloscope is an extremely useful instrument that has vertical channels for applied voltages and a horizontal channel where time is measured.

A sawtooth signal is applied to the horizontal channel. The periodic signal to be measured and the sawtooth signal are additing and must comply with the fact that they start at the same point, in general zero voltage and that the maximum of the two coincide, this causes the signal in each cycle to repeat and overlap the above showing a single measurement signal.

With the characteristics of the electric fields we can find how a pattern is formed and how two signals can be synchronized in the oscilloscope.

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The kangaroo's horizontal speed will be 9.7 m/s and its departure speed will indeed be 10.65 m/s.

By observing the pace at which this compressed region moves through the medium, we may determine the sound speed. The sound wave travels at a speed of around 343 meters per second in low humidity at 20 degrees Celsius.

The following equation relates the distance to the direction and initial velocity:

d = [v₀²sin2θ]/g, where θ – the angle of the jump.

Thus, v₀² = gd / (sin2θ) = (9.8×8)/0.69 = 113.62

v₀ = 10.65 m/s ( the take off speed).

The horizontal velocity equals:

vₓ = v₀cos 22° = 10.65 m/s × 0.92 = 9.7 m/s

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The expression for the time period using method of dimensions is \(T = [L]^{1/2}\times [LT^{-2}]^{-1/2}\).

The period of oscillation of a simple pendulum is the time taken for the pendulum to make a complete rotation.

The period of oscillation of a simple pendulum is calculated as;

\(T = 2\pi \sqrt{\frac{l}{g} }\)

where;

L is length (m)

g is acceleration due to gravity (m/s²)

The expression for the time period using method of dimensions is given as;

\(T = [L]^{1/2}\times [LT^{-2}]^{-1/2}\)

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The volume of the reservoir in cubic meters is approximately 432,523.8272 cubic meters.

To calculate the volume of the reservoir in cubic meters, we first need to convert the area of 50 acres to square meters. One acre is equal to 4046.86 square meters, so 50 acres is:

50 acres = 50 x 4046.86 = 202,343 square meters

Next, we need to convert the depth of 7 feet to meters. One foot is equal to 0.3048 meters, so 7 feet is:

7 feet = 7 x 0.3048 = 2.1344 meters

Now, we can calculate the volume of the reservoir using the formula:

Volume = Area x Depth

Volume = 202,343 square meters x 2.1344 meters

Volume = 432,523.8272 cubic meters

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smaller than the object and upright.

We have a negative lens, the image is between the object and the lens.

The top of the virtual image must be below and touching the ray that connects the top of the car with the lens (green)

So, the image will be smaller than the car and it won't be inverted.

Two football players are running towards each other in a straight line (exact opposite directions). Player A is running at 3.3 m/s and has a mass of 105 kg. Player B is 126 kg.

The players collide and their net momentum after the collision is 0 Ns. How fast was Player B running before they collided? The law of conservation of momentum states that in a closed system, the total momentum remains constant. Therefore, the total momentum of both players before collision equals the total momentum of both players after collision. This means: mA * VA + mB * VB = (mA + mB) * V, where VA and VB are the initial velocities of A and B, respectively, and V is their final velocity after the collision (which is 0).

So, we can rearrange the above equation to solve for VB. VB = (mA * VA) / mB Here, mA = 105 kg and VA = 3.3 m/s, and mB = 126 kg. Substituting the values, we get: VB = (105 * 3.3) / 126= 2.75 m/s Therefore, Player B was running at 2.75 m/s before they collided.

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Answer:

A. So that you can see if the answer to a problem makes physical sense.

Explanation:

Science can be defined as a branch of intellectual and practical study which systematically observe a body of fact in relation to the structure and behavior of non-living and living organisms (animals, plants and humans) in the natural world through experiments.

An experiment can be defined as an investigation which typically involves the process of manipulating an independent variable (the cause) in order to be able to determine or measure the dependent variable (the effect).

This ultimately implies that, an experiment can be used by scientists to show or demonstrate how a condition causes or gives rise to another i.e cause and effect, influence, behavior, etc in a sample.

Measurements refers to the process which typically involves the process of identifying and determining the dimensions of a physical object. The dimensions include important parameters such as width, height, length, area, volume, circumference etc.

In Science, making rough estimates of physical quantities is useful so that you can see if the answer to a problem makes physical sense.

For example, you could make a rough estimate of a storage tank and deductively determine whether or not it's in tandem with its physical size in reality.

#1

W and Y

Y has 6electrons-->2electrons to complete octet.

W has 2electrons-->6electrons to complete octet.

#2

Z and V

V needs 7electrons to complete octet.

Z needs 1 electron to complete octet.

W and Y, Y has 6electrons-->2electrons to complete octet. W has 2 electrons --> 6 electrons to complete the octet. Z and V, V needs 7 electrons to complete the octet. Z needs 1 electron to complete the octet.

A covalent bond is formed when two atoms exchange one or more pairs of electrons. The two atomic nuclei are concurrently drawing these electrons to them. The sharing of electron pairs between atoms occurs in covalent bonds.

In contrast to polar covalent bonds, which are formed when electrons are exchanged between atoms with uneven electronegativity, electron pairs shared between atoms with equal or very similar electronegativity form nonpolar covalent bonds, such as H-H or C-H. (e.g., H–O).

Therefore, when the difference between the electronegativities of two atoms is too tiny for an electron transfer to take place to create ions, a covalent bond is formed.

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Answer:

Absolutely no real-life phenomena/ uses are possible that are related to any branch of physics, except:

1 The device you are reading this answer on. (quantum mechanics, electronics )

2 The air conditioner in your room. ( electromagnetism, electronics )

3 The satellites and space stations in space which will help in the deciphering of the universe will help us look for a suitable planet when we render the earth useless. ( general and special relativity, classical mechanics )

4 Ohh. I forgot, do you wear clothes, well they are made in factories where factories run on the principles of thermodynamics, which is physics.

5 Ever gone somewhere? Well, the transportation uses classical mechanics, thermodynamics, electromagnetism, relativity ( if you know Global Positioning System )

6 GPS itself! It’s used in online maps, navigating, and this sort of stuff. It works on general relativity.

Honestly, this list is endless.

Answer:

1)  10 kg-m/s

2)  2 kg

3)  20 m/s

Explanation:

The momentum of an object can be calculated using the equation:

\(\large\boxed{p=mv}\)

where:

\(\hrulefill\)

For this question we need to find the momentum of a bowling ball whose mass is 4.0 kg is rolling at a rate of 2.5 m/s.

Given values:

Substitute the given values into the momentum formula and solve for p:

\(p=4.0\;\text{kg} \cdot 2.5\;\text{m/s}\)

\(p=10\;\text{kg m/s}\)

Therefore, the momentum of the bowling ball is 10 kg-m/s.

\(\hrulefill\)

For this question we need to find the mass of a skateboard rolling at a velocity of 3.0 m/s with a momentum of 6.0 kg-m/s.

Given values:

As we want to find mass, rearrange the momentum formula to isolate m:

\(\large\boxed{m=\dfrac{p}{v}}\)

Substitute the given values into the formula and solve for m:

\(m=\dfrac{6.0\; \text{kg m/s}}{3.0\; \text{m/s}}\)

\(m=2\;\text{kg}\)

Therefore, the mass of the skateboard is 2 kg.

\(\hrulefill\)

For this question we need to find the velocity of a baseball with a mass of 0.5 kg and a momentum of 10 kg-m/s.

Given values:

As we want to find velocity, rearrange the momentum formula to isolate v:

\(\large\boxed{v=\dfrac{p}{m}}\)

Substitute the given values into the formula and solve for v:

\(v=\dfrac{10\; \text{kg m/s}}{0.5\; \text{kg}}\)

\(v=20\;\text{m/s}\)

Therefore, the velocity of the baseball is 20 m/s.

Answer:

15.9 s

Explanation:

Power = work / time

 17 w  =   270 j / t      t = 15.9 s

Both the microscope and the telescope were invented during the Renaissance and that two inventions opened up scientific exploration.

Exploration Science is the practice and study of field research applied to real-world problems using a range of techniques, tools, and strategies.

When children explore science, they gain more than just a basic understanding of the subject, according to research that was funded by Ready to Learn. It improves language, literacy, and critical thinking abilities that result in the capacity to reason logically and solve problems creatively.

Exploratory, descriptive, and explanatory are the three categories into which scientific research projects can be divided according to their goals.

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Answer:b) atoms

Explanation:which are in turn made up of protons, neutrons and electrons

Answer:

B. Hope it helped brainiest plz

Explanation:

B. is that answer

Answer:

ehehehshehehehhehesh

Explanation:

ehehehehheheheeheh