Write about a time when you felt very cold and did something to make yourself feel warm, or a time when you felt hot and did something to cool yourself down. What caused the heat to transfer from one place to another place? How did this transfer of heat cause a change in temperature?

The magnitude of vector A must be equal to the magnitude of vector B

Vector equals vector b. For two vectors to be equal, their magnitudes and directions must be the same. A vector’s components can never have a magnitude bigger than the vector itself. This is demonstrated by Pythagorean’s Thereom. There is a possibility that a component of a vector has the same magnitude as the vector itself. E.g. A=2x + 0y.

According to the parallelogram rule, if two vectors are placed such that they have the same beginning point and then completed into a parallelogram, the total of the vectors is the directed diagonal that starts at the same position as the vectors.

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Answer:x rays are electromagnetic waves.

x rays are transverse waves

x rays travel at the speed of light

Explanation:

The sample will move very slowly in the opposite direction of the applied magnetic field, but it will eventually come to a stop when it reaches equilibrium.

Diamagnetic materials, unlike ferromagnetic or paramagnetic materials, do not possess any permanent magnetic moment or net magnetic dipole moment. The magnetic force acting on the diamagnetic material is perpendicular to its velocity, and hence it cannot accelerate the material along the direction of the magnetic field.

Since the sample is made of diamagnetic material, it will have a very weak and temporary magnetic moment induced in it when placed in a magnetic field. This induced magnetic moment will be in the opposite direction to the applied magnetic field. Therefore, the sample will experience a force in the direction opposite to the applied magnetic field. However, this force will be very weak since the diamagnetic material has a weak magnetic susceptibility.

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The distance of the motorboat relative to the home, which travels in various directions, is 3.07 km.

Relative velocity is a velocity of an object which is in respect to another observer, or it is a ratio of change in the position of a point to time with respect to another observer.

Given: Travel in East direction (\(d_{E}\))= 5 km,

velocity in N35E(v) = 2 m / s, time taken(t)  = 90 min = 5400 seconds,
Displacement in south (\(D_S}\)) = 6.5 km

Firstly, find the displacement  in N35E so

Displacement   = Velocity × time,

\(d_{NE}\) = 2 × 5400 = 10800 meters or 10.8 km

Now by using Pythagoras' theorem
We can calculate the return displacement in the south direction(\(d_{S}\)),

\(d_{S}\) = \(\sqrt{d^{2} _{NE}- d^{2} _{E } }\)
\(d_{S}\) = \(\sqrt{10.8^{2}-5^{2} }\)

\(d_{S}\) = 9.57 km

Therefore, the distance of the boat from the home (D) = \(d_S}\) - \(D_S}\)

D = 9.57 - 6.5;

D = 3.07 Km

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Answer:

Impulse

Explanation:

Impulse is force times time

Answer:

The answer is A) byee!!

Explanation:

Answer:

speed=abs(v)=40ms^-1

Explanation:

acceleration, a = (v-u)/t

since initial velocity u=0 (at rest) and a=8ms^-2,

8=v/5

hence after 5 seconds, v=40ms^-1

The 2.1 cm-thick layer of feather down on a goose provides thermal insulation to reduce the rate of heat loss from the body.

Assuming a goose has a 2.1 cm-thick layer of feather down and a body surface area of 0.15 m², we can use the concept of thermal insulation to calculate how effectively the feather down layer protects the goose from heat loss.

The rate of heat loss from a body is given by the equation:

Q/t = hA(Tbody - Tsurroundings)

where Q/t is the rate of heat loss, h is the heat transfer coefficient, A is the surface area of the body, Tbody is the body temperature, and Tsurroundings is the temperature of the surroundings.

The rate of heat transfer is inversely proportional to the thickness of the insulation layer, so we can assume that the thicker the feather down layer, the lower the heat loss rate. Therefore, a thicker layer of feather down would provide better insulation and help the goose to retain its body heat.

Assuming the temperature of the surroundings is lower than the body temperature of the goose, we can use the above equation to calculate the rate of heat loss from the goose's body, given its surface area and feather down thickness. From this, we can infer how well the feather down layer insulates the goose's body from heat loss.

However, it is worth noting that the rate of heat loss also depends on other factors, such as wind speed, humidity, and the temperature gradient between the body and the surroundings. These factors can affect the effectiveness of the feather down layer as an insulator and can lead to variations in heat loss rates.

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Answer:

A. primary waves

Explanation:

Answer: A negative charge of 2 c and a positive charge of 3 c are separated by a distance of 40 m. The force between these two charges are 33750000 N.

Explanation:

Force is an external agent that brings a change into body's state, direction, size or shape etc. It is measured in terms of newtons (N).

We know that

F= 9* 10∧9 Nm∧2 (charge1) (charge 2)/ C∧2 (distance)∧2

F= 9* 10∧9 Nm∧2 (-2 C) (3 C)/ C∧2 (40 m)∧2

F= -54* 10∧9/1600

F=3.375* 10∧7

F= 33750000 N

Therefore, The force between these two charges are 33750000 N.

If the pitot tube becomes clogged, the instrument that will become inoperative is the airspeed indicator.

The pitot tube is a device that is responsible for measuring the pressure of the air that is entering the aircraft.

The airspeed indicator uses this pressure measurement to calculate the speed of the aircraft relative to the surrounding air.

If the pitot tube becomes clogged, the airspeed indicator will not receive accurate readings, and the pilot will not be able to determine the speed of the aircraft.

This can be a very dangerous situation, especially if the pilot is flying in conditions with reduced visibility, such as clouds or fog. If the pilot is relying on the airspeed indicator to maintain a safe flying speed, they may inadvertently slow down or speed up, putting the aircraft and passengers at risk.

Therefore, it is essential for pilots to be aware of the importance of the pitot tube and to regularly check it for clogs or other issues. If a clog is detected, it should be addressed immediately to prevent any potential safety hazards.

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Answer:

m = 3.75 [kg]

Explanation:

We must remember that momentum is defined as the product of mass by Velocity, therefore it can be represented by means of the following equation.

\(P=m*v\)

where:

P = momentum = 93.75 [kg*m/s]

m = mass [kg]

v = velocity = 25 [m/s]

Now replacing, we can clear the mass:

\(P=m*v\\m=P/v\\m=93.75/25\\m=3.75 [kg]\)

Answer:

DDDDDDDDDDDDDDDDDDDDDDDDDDD

Answer:

Sh = Vh t         horizontal distance traveled

Sh = 10.2 m/s * 3.7 s = 37.74 m

The total energy of the body at evevry point is remained same due to the law of conservation of energy. Distance from A to B and final velocity of the ball just reach before C is 44.3 m/s.

d (distance) from A to B is = √2gh

In this case given are, g = 9.8 m/s² and h = 100m,

so here d = √(2⋅9.8⋅100) = 44.3m.

Final velocity ,v = √2gh

Here given are , v is the velocity, g is the acceleration due to gravity, and h is the height. In this case,

g = 9.8 m/s² ,h = 100m,

v = √(2⋅9.8⋅100)

= 44.3 m/s (final velocity)

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Our ability to retain encoded material over time is known as memory.

memory is the cognitive process by which information is encoded, stored, and retrieved. It involves the ability to retain encoded material over time. encoding refers to the process of converting sensory information into a form that can be stored in memory. Once information is encoded, it can be stored in different types of memory systems, such as sensory memory, short-term memory, and long-term memory.

Retention is the ability to maintain and retrieve information from memory over time. It is influenced by various factors, including the strength of the initial encoding, the level of rehearsal or repetition, and the presence of retrieval cues. The stronger the initial encoding of information, the more likely it is to be retained over time.

Therefore, our ability to retain encoded material over time is known as memory.

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The ability to retain encoded material over time is known as memory.

Memory is the ability of the mind to store and recall information and events that have already occurred. Memory is the capacity to acquire, process, store, and retrieve information over time. Encoding, storage, and retrieval are the three processes that makeup memory.

Encoding is the process of converting information into a format that can be stored in memory. Storage is the retention of information in memory. Retrieval is the process of recalling stored information from memory.

Memory is classified into three types: sensory, short-term, and long-term memory. Sensory memory retains information from the senses for a very short period of time.

Short-term memory is also known as working memory, and it can hold information for up to 20-30 seconds. Long-term memory has an indefinite storage capacity and can last from hours to years.

Memory formation is based on the principle of association. This implies that when information is encoded in the brain, it is connected to related information, which makes it easier to retrieve.

The more connections made, the more likely the information will be recalled. Memory can also be influenced by a variety of factors, including attention, emotion, motivation, and practice.

Memory is a complex phenomenon that involves a variety of processes and structures in the brain. While we still have much to learn about how memory works, our current knowledge provides us with insight into how to improve our ability to retain information over time.

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The focal length and the power of a lens that will correct this myopia when worn 2.0 cm in front of the eye is 16 cm and 6.25 diopters, respectively.

To correct the myopia of the physicist's left eye, we'll need to find the focal length and power of the corrective lens. The lens formula is:

1/f = 1/u + 1/v

where f is the focal length, u is the object distance, and v is the image distance. In this case, the eye can see clearly up to a distance of 33 cm (u), and the corrective lens is placed 2 cm in front of the eye, so the image distance (v) will be 33 cm - 2 cm = 31 cm.

Now, we can plug the values into the formula:

1/f = 1/33 + 1/31

To solve for f, we'll first find the common denominator, which is 33 * 31:

1/f = (31 + 33) / (33 * 31)

1/f = 64 / 1023

Now, we can find the focal length (f):

f = 1023 / 64 ≈ 16 cm

Next, we'll find the power (P) of the lens, which is the inverse of the focal length (in meters):

P = 1/f (in meters)

Since 16 cm is equivalent to 0.16 m, we can calculate the power:

P = 1/0.16 = 6.25 diopters

So, the corrective lens should have a focal length of approximately 16 cm and a power of 6.25 diopters to correct the myopia of the physicist's left eye.

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Answer: I'm like 98% sure it's fluorescent cause it's got mercury

Explanation:

Answer: 8v

Explanation:

The total voltage drop across the first and second resistor is 8 V, hence option A is correct.

Voltage is the fluctuation in electric potential between the two places. It is sometimes produced by electric pressure, electric tension, or voltage source. The work required to move a test charge between two places in a static electric field corresponds to this. The derived measure for voltage in the International System of Units is called a volt. Work per unit energy is expressed in SI units as joules per coulomb, with 1 volt equaling 1 joule per 1 coulomb.

To detect the voltages between two locations in a circuit, use a voltmeter. A common reference point, like the system's foundation, is frequently utilized as one of the points.

A voltage can indicate either a supply of energy or its loss, dissipation, or storage.

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In order to replace the 700-N force P applied at point A, we can use two equivalent systems.

(a) For the first system, we can create an equivalent force-couple system at point C. This means applying a force of 700 N at point C in the opposite direction of the original force P, along with a couple moment. The magnitude of the couple moment would be 700 N multiplied by the perpendicular distance between points A and C.

(b) For the second system, we can replace the force P with a vertical force at point B and a second force at point D. The magnitude of the vertical force at B would be equal to 700 N, and the second force at D would have the same magnitude but in the opposite direction. These forces at B and D should be positioned in a way that the net effect is equivalent to the original force P at point A.

By using either the force-couple system at point C or the system with vertical forces at points B and D, we can achieve the same overall effect as the original force P at point A.

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Answer:

Electric force

Explanation:

It’s like static stuff

Answer:

(a) The acceleration of the train and cars is approximately 0.304 m/s²

(b) The tension between the locomotive and the car connected to the locomotive is approximately 0.4166 N

Explanation:

The given parameter are;

The mass of the toy locomotive = 0.979 kg

The mass of one car = 0.952 kg

The mass of the other car = 0.419 kg

The total mass of the train locomotive and cars = 0.979 + 0.952 + 0.419 = 2.35 kg

The weight of the train locomotive and cars = 9.81 m/s² × 2.35 kg = 23.0535 N

The normal force of the train and cars = The weight of the train locomotive and cars = 23.0535 N

The coefficient of dynamic friction = The normal force × The coefficient of dynamic friction

The coefficient of dynamic friction = 23.0535 × 0.110 = 2.535885 N

The applied force = 3.25

The net force acting on the train locomotive and cars = 3.25 - 2.535885 0.714115 N

(a) Force = Mass × Acceleration

Acceleration = Force/Mass

∴ The acceleration of the train and cars = 0.714115 N/(2.35 kg) ≈ 0.304 m/s²

(b) The tension between the locomotive and the car connected to the locomotive = T₂ = ( (m₁ + m₂)/ (m₁ + m₂ + m₃)) × F

Therefore, T₂ =  ( (0.952 + 0.419)/ (0.952 + 0.419 + 0.979)) × 0.714115 ≈ 0.4166 N.

Answer:

v = 10 m/s

Explanation:

recall that velocity is related to wavelength and frequency by the formula

v = fλ

where v = velocity, f = frequency and λ= wavelength

Simply substitute these into the formula:

v = fλ

v = (0.5)(20)

v = 10 m/s

A wire develops a ring-shaped magnetic field when current passes through it. The magnetic compass point may be deflected by this magnetic field. Closer to the wire, the magnetic field is stronger, and its intensity grows as the current does as well.

What is a magnetic field?

The magnetic effect on moving electric charges, electric currents, and magnetic materials is described by a magnetic field, which is a vector field. A force perpendicular to the charge's own velocity and the magnetic field acts on it when the charge is traveling through a magnetic field.

A magnetic field is produced along the axis of a wire coil by a current flowing through it. Curling the fingers of the right hand in the direction of the current through the loop and pointing the thumb in the direction of the magnetic field will reveal the direction of the field inside the circle.

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Answer:

questions

Explanation:

1. what type of friction is air resistance

2. what two factors affect air resistance

3.what does it mean when an object is in free fall

Wien's law relates the wavelength at which a star emits the most energy to its temperature.

Wien's law, also known as Wien's displacement law, states that the wavelength at which a star emits the maximum amount of energy is inversely proportional to its temperature.

The law is derived from the Planck radiation law and provides valuable insights into the relationship between temperature and the peak wavelength of radiation emitted by an object, such as a star.

According to Wien's law, as the temperature of a star increases, the wavelength at which it emits the most energy decreases. This means that hotter stars emit a greater proportion of their energy at shorter wavelengths, such as ultraviolet or blue light.

On the other hand, cooler stars emit most of their energy at longer wavelengths, such as red or infrared light. For example, our Sun has a surface temperature of approximately 5,500 degrees Celsius, and its peak emission occurs in the visible light range, specifically in the green part of the spectrum.

This is why the Sun appears yellow to our eyes. In contrast, much hotter stars, like blue giants, have surface temperatures exceeding 25,000 degrees Celsius and emit a significant portion of their energy in the ultraviolet range.

In summary, Wien's law states that the wavelength of maximum energy emission from a star is inversely proportional to its temperature. It provides a fundamental understanding of the relationship between the temperature of a star and the dominant wavelength of its emitted radiation.

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Answer:

\(e \: = \: \frac{kq}{{r}^{2} } \)

then q = e r² / k

then q = 100 * (50 ×10^-2)² / 9×10^9 = 2.777777778×10^-9 C

\(2.8\times 10^{-9}C\) is value of q

An electric property associated with each point in space when charge is present in any form.

The magnitude and direction of the electric field are expressed by the value of E, called electric field strength .

By definition,

The electric field of a point charge is given as follows:

\(E = k\dfrac{q}{r^2}\)

​Where q is the charge,

r = 50cm = 0.5mr=50cm=0.5m is the distance from the charge,

k =\(9\times 10^9N\cdot m^2/C^2\)

C is the Coulomb's constant.

Substituting E = 100N/C and expressing q,

obtain:

\(q = \dfrac{Er^2}{k} = \dfrac{100\cdot 0.5^2}{9\times 10^9} \approx 2.8\times 10^{-9}C\)

Therefore,

\(2.8\times 10^{-9}C\) is the value of q.

The complete question is given below:

If the electric field is 100N/C at a distance of 50 cm from a point charge , what is the value of q?

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Answer:

1.23 x 10^ -7

Explanation:

0.000000123, move the decimal to the right 7 places

Using the gravitational force, the mass of item 1 and object 2, and the Newton's law of gravity calculator, one may calculate the distance between two objects.

g = GM/r2, where M is the Earth's mass, r is its radius (or the distance from the Earth's center to where you are standing), and G is the gravitational constant. The gravitational constant is G (without the subscripts), while the speed of light is c.

By applying Newton's equation, we can accomplish this quite easily: forcegravity is defined as G M m2 separation. Suppose that you weigh 60 kilograms and your colleague weighs 70 kilograms. The center-to-centre distance, r, is 1 m, and the gravitational constant, G, is 6.67 10 -11 newtons square meter kilogram-2.

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