when an object is charged by contact, what kind of charge does the object have compared with the charge on the on the object giving the charge?

Answer:

See the explanation below.

Explanation:

Newton's third law states that any force applied to a body generates a reaction equal and in opposite direction to the original Force.

In order to better understand how a person's movement is generated when walking, we will analyze the attached image below, where we see the forces acting.

The red vector goes in the direction of the person's movement, this force vector pushes the person to move forward.

Solution,

We know that,

\(f = ma \\ \frac{f}{m} = a \\ \frac{1000}{100} = a \\ 10 = a\)

Therefore,

Acceleration produced will be 10m/s².

The electric flux through the sphere is 6.63×10⁴ N·m²/C. The formula for electric flux through a surface is given by;ϕ=E×Acosϴwhere;ϕ= electric fluxE= electric field intensityA= area of the surfaceϴ= angle between the electric field vector and the normal vector to the surface .

The electric field intensity, E, at any point inside the sphere can be calculated using the formula  between the charge and the object The electric field intensity at any point inside the sphere is the vector sum of the electric field intensities at that point due to the two charges.The distance between the two charges is not provided, so we will assume that they are at equal distances from the center of the sphere.

Let r be the distance between each charge and the center of the sphere.The electric field intensity at any point inside the sphere due to the 7.6 μC charge is given by;E₁= kq₁/r²= 9×10⁹ × 7.6×10⁻⁶ / r²The electric field intensity at any point inside the sphere due to the -4.7 μC charge is given by The electric field intensity at any point inside the sphere due to both charges is given by The electric flux through the sphere is given by;ϕ=E×AcosϴSince the sphere is uncharged, the net electric flux through the sphere is zero The electric flux through the sphere is 6.63×10⁴ N·m²/C.

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Frequency is \(2 drop/second\)

Period is \(0.5\)

Wavelength is \(15 m\)

Speed of propagation of wave is \(30m/s\)

Given:

           Drop on the surface of pool at the rate 120 drops per minute

          Distance between third cycle and the seventh cycle is 60 m

To find :

           Frequency, period and wavelength and speed of propagation of wave.

Solution:

          Since, frequency is number of cycles or vibration per second

      So, frequency \(=\frac{120 drops}{60 second} \\=2 drops/ second\)

    Period is reciprocal of frequency.

       So,  \(period=\frac{1}{frequency}\\ \\ =\frac{1}{2} \\=0.5\)

    Wavelength is distance between two consecutive cycle or vibrations.

               \(wavelength=\frac{60}{4}\\\\ =15 m\)

\(Speed of propagation of wave=\frac{Wavelength}{Period} \\\\=\frac{15}{0.2}\\\\=30 m/s\)

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Answer:

As = 7.33 [m/s]

Explanation:

To solve this problem we must use the definition of the average speed, which is equal to the relationship between the distance over time.

As = x/t

where:

As = average speed [m/s]

x = distance = 132 [m]

t = time = 18 [s]

As = 132/18

As = 7.33 [m/s]

Therefore, the magnitude of `B` is `y = 7.04`.

Thus, the magnitude of `B` is `7.04` units.

Let's denote `B` as a vector `(x, y)`.

So we can write

\(`C+B` as `(i + x)j + (j + y)j = i j + xj + j j + yj`.As `C + B\)`

is in the positive y direction,

`x=0` and `y > 0`.

 Therefore, we have

\(`C + B = 3.8 j + (6.1 + y) j = (6.1 + y + 3.8)j`.\)

To find the magnitude of `B`, we can equate the magnitudes of

`C + B` and `C`.

So we have

\(|`C + B`| = `|C|`|`6.1 + y + 3.8`| = `|6.1i + 3.8j|`\)

Using Pythagoras' theorem,

`|6.1i + 3.8j| = sqrt(6.1^2 + 3.8^2) = 7.14`.

Therefore,

\(`|6.1 + y + 3.8| = 7.14``10 - 6.1 - 3.8| = 7.14\)

\(``y = 7.14 - 10 + 6.1 + 3.8``y = 7.04`\)

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Answer:

Electronics (mainly), discovery of quantum mechanics, transistors, element properties, etc.

Explanation:

Great question. I think that it's widely agreed upon that the existence of handheld gadgets, as well as most electronics such as these, came from the advent of quantum mechanics (QM). Quantum mechanics allowed us to look at the behavior of electrons, as they are different from everyday objects. You can think of QM at the interface of chemistry and physics. Quantum mechanics is important, considering it predicts how electrons have to flow through your phone. This was especially helpful in determining their behavior regarding solid materials like the ones that make up your phone. Also, there are several materials that go into a phone, among these certain elements, such as silicon (a semiconductor) and copper/silver, which are great at conducting electrons. Eventually we started using things called transistors, which can amplify and switch electronic signals when needed. These can thought to be a direct product of QM. There are also all kinds of diodes and things that can emit light, among other things.

Also, you have to get the electricity from somewhere, and that can come from a controlled chemical reaction that you can charge right in your phone! That is basically what a battery does, it converts chemical energy (using chemical reactions) into electrical energy that powers your phone. So in short, electronics, chemistry of materials (governed by physics) and especially understanding of how electrons work with tiny transistors in your phone come together to even show you this answer. Wow.

A day would be 85 min long if the earth were rotating so fast that objects at the equator were apparently weightless.

At the equator, the centrifugal force and gravitational force must be equal in order to feel weightless.

\(\frac{mv^{2} }{R} = mg\)

∴ \(v = \sqrt{gR}\)

\(\frac{2\pi r}{T} = \sqrt{gR}\)

\({T} = \frac{2\pi r}\sqrt{gR}\)

\(T= \frac{2 \pi (64000)}{\sqrt{9.8(64000)} }\)

T = 5.07×10³s

∴T = 85 min.

While Earth rotates on its axis from west to east, the Sun and Moon appear to move across the sky from east to west. The term "rotation" in science refers to the Earth's rotation about its axis. The axis has an angle of 23 1/2° and is parallel to the Earth's orbital plane. The fact that the northern and southern hemispheres tilt away from the Sun suggests that the Earth's axis is inclined. The Earth revolves, dividing it into a lit up and dark half, resulting in day and night. You can tell which way the Earth is rotating depending on your point of view. When looking downward from the North Pole, Earth turns anticlockwise. When seen from the south pole, however, the world revolves anticlockwise.

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Answer:

concave mirror

Explanation:

When the absolute magnitudes, or brightness's, of stars are plotted against their surface temperatures or colors, we obtain an H-R Diagram.

First it is important to note that the full meaning of H-R in this case is:
Hertzsprung-Russell.

The Hertzsprung-Russell Diagram is an instrument or device that is used for studying starts and other celestial bodies.

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Answer:

a. 10.2 N b. 1.73 c. 58.8 N d. 10.2 N

Explanation:

a. The force that will make the block slide down the plane

This is the component of the block's weight along the plane F = mgsinθ where m = mass of block = 1.2 kg, g = 9.8 m/s² and θ = angle of incline = 60°.

So, F = mgsinθ = 1.2 kg × 9.8  m/s² × sin60°.= 10.18 N ≅ 10.2 N

b. The coefficient of friction

The coefficient of friction, μ = tanθ = tan60° = 1.73

c. The normal reaction.

This is equal to the vertical component of the block's weight. So, F = mgcosθ. Substituting the values for the variables from above, we have

F = mgcosθ = 1.2 kg × 9.8  m/s² × cos60°.= 58.8 N

d. The frictional force

Since the block does not slide, there is no net force on it. If f is the frictional force, then

F - f = ma. Since a = acceleration = 0,

F - f = 0

f = F = mgsinθ = 1.2 kg × 9.8  m/s² × sin60°.= 10.18 N ≅ 10.2 N

The pressure of 76 cm of mercury column is 10132.5 Pa.

Pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid.

The pressure of 76 cm of mercury column can be converted to Pascals (Pa) using the following conversion factor:

1 atm = 101325 Pa

760 mmHg = 1 atm

Therefore,

76 cm Hg = (76/760) atm = 0.1 atm

Now, we can convert this pressure in atm to Pascals using the following conversion factor:

1 atm = 101325 Pa

Therefore,

0.1 atm = 0.1 * 101325 Pa = 10132.5 Pa

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--The complete question is, Pressure of 76cm of mercury column is ______ pa.--

So that neither the patient nor the researchers can subconsciously alter the results.

Answer:

Shape

Density

color

Explanation:

Among the given options, the correct statement about the combination of four unequal resistors connected in parallel is that the equivalent resistance is less than that of the smallest resistor.

In a parallel combination, the voltage across each resistor is the same and the current is divided among the resistors. Therefore, the total current through the combination is equal to the sum of the currents through the individual resistors. According to Ohm's Law, the current through a resistor is inversely proportional to its resistance.

Therefore, the resistor with the smallest resistance will allow the most current to flow through it. As a result, the overall resistance of the combination will be less than that of the smallest resistor. Hence, the correct statement about the combination of four unequal resistors connected in parallel is that the equivalent resistance is less than that of the smallest resistor.

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The combination of frequencies that produce the lowest beat frequency is 10 Hz and 15 Hz. The correct option is C.

To determine the beat frequency, we subtract one frequency from the other and take the absolute value. The beat frequency is the difference between the frequencies involved in the interference pattern created by two sound waves.

Let's analyze each option:

A. 500 Hz and 501 Hz: The beat frequency would be 501 Hz - 500 Hz = 1 Hz.

B. 10 Hz and 20 Hz: The beat frequency would be 20 Hz - 10 Hz = 10 Hz.

C. 10 Hz and 15 Hz: The beat frequency would be 15 Hz - 10 Hz = 5 Hz.

D. 500 Hz and 600 Hz: The beat frequency would be 600 Hz - 500 Hz = 100 Hz.

Therefore, option C (10 Hz and 15 Hz) produces the lowest beat frequency of 5 Hz compared to the other options.

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Answer:

F = - k x       restoring force for spring constant k

k = F / x = 10 N / .02 m = 500 N / m      force and x are in different directions

B.      N / m = force / distance   given as k

x = F / k = 10 N / 500 N / m = .02 m

C.    F = -k x = 500 N / m * .009 m = 4.5 N

In the absence of air resistance, an angle of 15 degrees is required for a ball to be thrown to go the same distance as one thrown at an angle of 75 degrees.

A projectile is an object that is launched into the air and then moves only in response to the acceleration of gravity. The trajectory of the object is referred to as the projectile's trajectory.

As is common knowledge, the projectile's motion range is determined by;

  R = v²sin(2θ)/g

Here, we know that the range for two different angles will be the same.

Consequently, we can state that the two angles must be complementary.

hence, the two angles must be

θ, 90 - θ

In light of the fact that one projection angle is 75 degrees

Therefore, the second angle over the same range must be 90 - 75 = 15 degrees.

hence another projection angle of 15 degrees is required.

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Answer:

In English traditional grammar, a phrasal verb is the combination of two or three words from different grammatical categories: a verb and a particle, such as an adverb or a preposition — to form a single semantic unit on a lexical or syntactic level. Examples: turn down, run into, sit up.

Explanation:

Answer:

D. A followed by B

Explanation:

You can see at section A solid Ice at temperature 0°C gets heated up for and all the energy generated from heating up the ice is used to break the bonds which holds the ice together as a solid .

while at Section B the liquid water at 100°C changes to vapor because the heat energy applied here breaks intermolecular bonds c.

The section where A is followed by C of the heating curve illustrate this process. The correct option is D.

The heating curve represents the association between the supply temperature of the heating system and the external air temperature.

As can be seen in section A reliable Ice at 0°C is heated, and all of the energy generated by heating the ice is used to shatter the bonds that hold the ice together as a solid.

While in Section B, liquid water at 100°C transforms to vapor because the heat energy applied here shatters the intermolecular bonds c.

Thus, the correct option is D.

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The total distance covered by the locomotive (toy) during the first and second journey is 10500 meters.

D) The answer is not given in the Options.

Note that: Speed/velocity is distance traveled per unit time.

Speed = Distance ÷ time

Distance = velocity × time

Given that;

For the first journey,

For the second journey,

Distance covered in the first journey

Distance = velocity × time

Distance = 25m/s × 300s

Distance = 7500m

Distance covered in the second journey

Distance = velocity × time

Distance = 10m/s × 300s

Distance = 3000m

Total distance covered will be;

Total Distance = Distance covered in the first journey + Distance covered in the second journey

Total Distance = 7500m + 3000m

Total Distance = 10500m

Therefore, the total distance covered by the locomotive (toy) during the first and second journey is 10500 meters.

D) The answer is not given in the Options.

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Mass and weight are two concepts that are often confused, but they have a critical distinction. Mass refers to the amount of matter in an object, while weight is the force that the object exerts on the ground due to gravity.

Mass is a scalar quantity that measures the amount of matter contained in an object. The SI unit of mass is the kilogram (kg). The mass of an object is the same regardless of its location in the universe. So, my mass is 60 kg.

Weight is a vector quantity that measures the force exerted on an object by gravity. The SI unit of weight is the Newton (N). It is calculated by multiplying the mass of an object by the acceleration due to gravity, which is approximately 9.81 m/s² on Earth.

So, my weight can be calculated as follows:

Weight = mass x acceleration due to gravity
Weight = 60 kg x 9.81 m/s²
Weight = 588.6 N

Therefore, my mass is 60 kg, and my weight is 588.6 N. The difference between mass and weight is that mass is an intrinsic property of an object, whereas weight depends on the object's mass and the gravitational force acting on it.

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Answer:

18m

Explanation:

The student should be 18m away from the teacher

Answer:

150m = total displacement

Explanation:

50*3=150m

AnswerThe current through a toaster connected to a 120-V source is 8.0 A. What power is given off by the toaster? p= 8.0 A : 120V (p=960 W Page 2 7. The resistance of an electric stove eleinent at operating temperature is 11 12.

Explanation:

hope this helps =)

Hello!!

For calculate the resistance of the toaster, we have to applicate formula:

\(\boxed{R= V^{2}/P}\)

\(\textbf{Being:}\)

\(\sqrt{}\) \(P = Potency \ power = 1500 \ W\)

\(\sqrt{}\) \(V = Voltage = 120 \ V\)

\(\sqrt{}\) \(R = Resistance = \ ?\)

\(\text{Then let's \textbf{replace it according} we information:}\)

\(R = (120 \ V)^{2} / 1500 \ W\)

\(R = 9.6 \ \varOmega\)

\(\textbf{Result:}\\\text{The power of the toaster is \textbf{9.6 Ohms}}\)

Answer:That only applies to highly polished surfaces, eg mirrors.

If you take a high quality laser (ie with low divergence) and aim it at a wall, you can see the spot where the laser beam reaches the wall from anywhere with a direct line-of-sight to the spot where the laser beam reaches the wall. This due to micro imperfections on the surface of the wall. At a microscopic level, the wall surface is very rough and pointing in all directions.

As to why, a beam of light bounces of a highly polished surface, I can only surmise that it is essentially due to kinematics, ie the only force opposing the light beam is normal to the surface, hence there no forces along the reflective surface. Since there are no forces along the reflective surface, the speed component of light along the reflective surface remains unchanged. However, on the plane perpendicular to the reflective surface the, the light photons bounce off at the same speed at which the hit the reflective surface because the mass of the reflective surface is much much much larger than the mass of the photons, which means that the reflective surface won’t move at all. Since conservation of momentum requires that momentum after the collision be the same as the momentum before the collision then the only way for that to happen is if the velocity of the photon perpendicular to the reflective surface is of exactly the same magnitude but in the opposite direction. Vector resolution of the speed component of the reflected beam means that the angle of reflection must be the same as the angle of incidence.

Explanation:

Answer:

3.41 × 10^-6

It is because 341 has to be a decimal and the zeros you see there...always count them if the zero has the decimal after it it will be a negative. Why 10 to the power of Negative 6? Count the 6 zeros