At what condition do a coin and a feather fall together? What is the acceleration of the coin and feather at that instant? Justify your answer.​

Given that

heat capacity of water = 4200

heat capacity of aluminium = 897

heat capacity of oil = 1900

heat capacity of gold = 129

Heat capacity is the amount of heat a material absorbs to increase its temperature by 1 degree Celsius.

So, larger the heat capacity of a material lower will be the temperature change.

If equal amount of energy is applied to the materials, then gold will have the greatest temperature change as its heat capacity is lowest than other materials.

1)  Light energy ----> 2) Electricity ----- > 3)Sound energy

4) Light energy ------> 5) Heat energy ----> 6) Kinetic energy

7) Light energy ----> 8) Chemical energy -----> 9) Kinetic energy

10) Light energy -----> 11) Heat energy

12) Light energy ------> 13) Electrical energy -----> 14) Kinetic energy

We know that energy transformation has to do with the change of the energy from one form to the other. We have to note that from the first law of thermodynamics, it is clear that energy can not be created nor destroyed but it can be transformed from one form to the other.

Now, we have to note that in all the cases that we have below, there is the transformation of energy from one form to the other as shown above.

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The magnetizing current of a transformer does not lie in-phase with the applied voltage. It lags the applied voltage by a small angle.

Magnetizing current

No, the magnetizing current of a transformer does not lie in-phase with the applied voltage. It is slightly lagging behind the applied voltage by a small angle. This is because the transformer core has a small amount of resistance, which causes a small voltage drop across the core. This voltage drop is in-phase with the current, and it causes the current to lag behind the voltage by a small angle.

When the transformer core is saturated, the magnetizing current increases sharply. This is because the core becomes increasingly difficult to magnetize as it approaches saturation. The increased magnetizing current causes the transformer to lose efficiency and to produce more heat.

Inrush current

The inrush current of a transformer can cause a number of problems, including:

Overloading the transformer

Tripping the transformer's protective devices

Damaging the transformer's windings

Starting a fire

Even at no-load, a transformer draws a small amount of current from the mains. This current is called the magnetizing current. The magnetizing current is required to create the magnetic field in the transformer core. The magnetic field is necessary to induce the voltage in the secondary winding.

Exciting resistance and exciting reactance

The exciting resistance of a transformer is the resistance of the transformer core. The exciting reactance of a transformer is the reactance of the transformer's windings. The exciting resistance and exciting reactance together form the transformer's impedance.

Transformers are not designed to operate in the saturated region. The saturated region is a region where the core is unable to produce any additional magnetic flux. This can cause a number of problems, including:

Increased magnetizing current

Decreased efficiency

Increased heat generation

Transformers are designed to operate in the linear region, where the core is able to produce a linear relationship between the applied voltage and the induced voltage. This allows the transformer to operate efficiently and to produce the desired amount of power

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The study of radioactivity by Marie Curie marked a significant turning point in the realm of physics and had a significant influence on scientific knowledge. Now let's get into the specifics.

"Radioactivity" is the term Marie Curie coined to describe the phenomenon whereby materials emit radiation that can fog photographic plates. During her uranium investigation in 1896, she made this discovery. This game-changing discovery opened the door for more research into and comprehension of radioactivity, which resulted in important developments in the field of nuclear physics.

Marie Curie's research on radioactivity served as a springboard for additional nuclear physics research and has profound ramifications for other fields of science and medicine. It resulted in improvements in our knowledge of atomic structure, the creation of radiation therapy for the treatment of cancer, and the eventual exploitation of nuclear energy.

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The net impulse on the cabinet during the 2-second time interval when a 100 lb force is applied is 200 lb·s.

The net impulse on an object is equal to the change in its momentum, which can be calculated using the equation,

Impulse = Force x Time

In this case, a force of 100 lb is applied to the cabinet for 2 s. Since the surface is smooth, there is no frictional force acting on the cabinet, and it will move with a constant velocity after the force is applied.

The initial momentum of the cabinet is zero, since it is initially at rest. The final momentum of the cabinet can be calculated using the equation:

Final Momentum = Mass x Velocity

Since the mass of the cabinet is 100 lb, and it moves with a constant velocity after the force is applied, its final momentum is:

Final Momentum = 100 lb x v

where v is the velocity of the cabinet.

Since the force is applied for 2 s, the impulse on the cabinet is:

Impulse = Force x Time = 100 lb x 2 s = 200 lb·s

Since there are no external forces acting on the cabinet, the net impulse on the cabinet during this time interval is equal to the impulse calculated above:

Net Impulse = Impulse = 200 lb·s

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The  friction between the tires and the road causes loss of energy in the form of heat-energy.

The term kinetic energy refers to the energy of an object that is in motion. The pasengers that are sitting at a point possess potential energy. If the bus stops suddenly, the potential energy of the passengers is converted to kinetic energy as they move forward.

Since friction causes loss of energy, the  friction between the tires and the road causes looss of energy in the form of heat-energy.

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The recoil speed of the flatcar is0.5 m/s.

The cannon's momentum equals the flatcar's momentum according to Newton's third law of motion.

mv = MV........................ Equation 1:

where m is the cannon's mass, v is its velocity, and m is the flatcar's mass, v is its velocity.

Assign V as the subject of the equation V = mv/M... Equation 2

Given: M = 1000 kg

m = 10 kg,

and v = 50 m/s

Replace with V = 1050/1000 V = 500/1000

V = 0.5 m/s in equation 2.

Consequently, the flatcar's speed is equal to 0.5 meters per second.

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At atmospheric pressure, the water inside a water barometer is about 33.9 feet high. This is equal to the mercury's height in a mercury barometer, which is only 2.49 feet at atmospheric pressure.

As a general rule, severe weather is indicated by low air pressure, and pleasant weather is indicated by high air pressure. Weather will worsen if pressure is dropping while improving if pressure is rising. The speed of the fall or rise will determine how quickly and how much the weather would change.

The barometer is a device that gauges air pressure. Hectopascals is one of the many measurement types used by the barometer to determine air pressure (hPa). The liquid barometer, analog barometer, and mercury barometer are just a few examples of the different types of barometers.

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Yhe main difference between the two is that digital radio doesn't send complete information all at once

CAN SOMEONE IN THE COMMETS ON EDG HELP ME WITH THIS IM NOT DOING THIS 4 POINTS I ACTULLY NEED HELP AND STRUGGLING U GUYS CAN CAN PUT A 1.0 STAR I REALLY DONT CARE BUT CAN SOMEONE HELP PLZ

Answer:

82.2

Explanation:

Answer:

240.1 m

Explanation:

Potential energy  ( mgh)  is fully converted to Kintetic energy ( 1/2 mv^2)

  equate them

mgh = 1/2 mv^2     divide by 'm'

gh = 1/2 v^2

9.8 h = 1/2 v^2

    19.6 h = v^2         v = sqrt ( 19.6h)     (as given)

                               68.6 = sqrt (19.6 h)     solve for h = 240.1 m

The ratio of the speeds of sound in the two liquids (Va/Vb) is 2√2.

The speed of sound in a medium is determined by the square root of the ratio of the bulk modulus (K) to the density (ρ) of the medium.

The ratio of the speeds of sound in the two liquids (Va/Vb) can be calculated using the given information:

Va/Vb = √(Ka/Kb * ρb/ρa)

Given that the bulk modulus of liquid A (Ka) is twice that of liquid B (Kb), and the density of liquid A (ρa) is one half of the density of liquid B (ρb), we can substitute these values into the equation:

Va/Vb = √(2 * ρb / (1/2 * ρa))

Simplifying further:

Va/Vb = √(4 * ρb / ρa)

Since the ratio of the densities is ρb/ρa = 2, we have:

Va/Vb = √(4 * 2) = √8 = 2√2

Therefore, the ratio of the speeds of sound in the two liquids (Va/Vb) is 2√2.

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Brandon has 34.36 seconds to get to the point on the other side of the river.

The Upstream method to save ones stick glide would be to ensure that the controller is not passively exposed to anything that is likely floating in the air. Furthermore, we advise against snacking while gaming. While this may be tempting, you may end up with bits of meals stuck to ones control.

Calculation:-

⇒     Wide of river = 50 m

⇒    Downstream length = 200 m

⇒     Drift distance = √50² + 200²

⇒                   = √2500 + 40000

⇒                      = √ 42500

⇒               = 206.16 D.

⇒       Vmr  = 4 + 2

⇒               = 6 ms⁻¹

⇒ t minimum =  d/Vmr

⇒               = 206.16/6

⇒               = 34.36 sec.

Therefore, the minimum amount of time Brandon can take to reach the point on the opposite side of the river is 34.36 seconds.

The concepts of minimum time problems are used in a variety of fields, including physics, engineering, and optimization. By understanding how to solve these types of problems, we can design and optimize systems and processes to achieve desired outcomes in the most efficient way possible.

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Answer:

Current, I = 8 Amps

Explanation:

Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.

Mathematically, Ohm's law is given by the formula;

\( V = IR\)

Where;

V represents voltage measured in voltage.

I represents current measured in amperes.

R represents resistance measured in ohms.

Given the following data;

Resistance, R = 30 ohms

Voltage, V = 240V

To find the current;

\( I = \frac {V}{R} \)

\( I = \frac {240}{30} \)

Current, I = 8 Amps

Therefore, the current of the dryer is 8 Amperes.

Answer:

I = 5[amp]

Explanation:

Electrical power is defined as the product of voltage by current.

\(P=V*I\)

where:

P = power = 1150 [W]

V = voltage = 230 [V]

I = current [amp]

Now replacing:

\(1150=230*I\\I=1150/230\\I=5[amp]\)

A 15 [amp] fuse must be used. Always the fuse must be larger than the operating current, to protect the equipment from very high currents. above 15 [amp]

Answer:

one billion to ten billion joules.

Explanation:

To keep a 100-watt light bulb going for one second, one hundred joules of energy will be used.

Answer:

In 3 lightning bolts, there is approximately 1 billion to ten billion joules.

Explanation:

The half-life of 40K is approximately 1.3 billion years. Given a ratio of 40Ar/40K as 3/1 in a granite sample, we can estimate the age of the sample by understanding the decay process.  Based on the given 40Ar/40K ratio, the age of the sample is approximately 650 million years.

Since the half-life of 40K is 1.3 billion years, this means that after each half-life, half of the 40K atoms will have decayed into 40Ar. Therefore, if the ratio of 40Ar/40K is 3/1, it suggests that three-quarters (or 75%) of the original 40K atoms have decayed into 40Ar.

To determine the age, we can calculate the number of half-lives that have occurred based on the remaining 25% of 40K. Since each half-life is 1.3 billion years, dividing the remaining 25% by 50% (half) gives us 0.5. Thus, the sample has undergone 0.5 half-lives.

Multiplying 0.5 by the half-life of 1.3 billion years gives us an estimated age of 0.65 billion years, or 650 million years, for the granite sample.

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Answer:

A proton has a positive charge :)

A neutron has no charge because it is neutral :)

Have a great day!!

Please rate and mark brainliest!!

A proton is positively charged while a neutron has no charge at all.

The voltage will decrease after approximately 25.7 microseconds.

To determine the time it takes for the voltage across the flashlight bulb to drop to 2 V, we need to calculate the time constant of the circuit, which is given by:

\(τ = RC\)

where R is the resistance of the flashlight bulb and C is the capacitance of the capacitor.

Since the problem does not provide the value of the resistance of the flashlight bulb, we cannot determine the time constant directly. However, we can estimate the resistance of the bulb based on its power rating.

Let's assume that the flashlight bulb has a power rating of 0.5 W. Using Ohm's law (P = IV) and the fact that the voltage across the bulb is initially 3 V, we can estimate the initial current through the bulb to be:

\(I = P / V = 0.5 / 3 = 0.1667 A\)

Assuming that the resistance of the bulb is constant over time (which is not strictly true, but a reasonable approximation), we can use Ohm's law again to estimate the resistance of the bulb:

\(R = V / I = 3 / 0.1667 = 18 Ω\)

Now that we have an estimate of the resistance, we can calculate the time constant:

\(τ = RC = 18 * 3e-6 = 54e-6 s\)

To find the time it takes for the voltage across the bulb to drop to 2 V, we can use the equation:

\(V(t) = V0 * e^(-t/τ)\)

where V0 is the initial voltage (3 V) and V(t) is the voltage at time t. We want to find the time t when \(V(t) = 2 V.\)

\(2 = 3 * e^(-t/τ)\)

Taking the natural logarithm of both sides, we get:

\(ln(2/3) = -t/τ\)

Solving for t, we get:

\(t = -ln(2/3) * τ\)

Substituting the values we have calculated, we get:

\(t = -ln(2/3) * 54e-6 = 25.7 μs\)

Therefore, it will take about 25.7 microseconds for the voltage across the flashlight bulb to drop to 2 V.

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Answer:

5m/s

Explanation:

Theta = position angle, t = time, and w = angular velocity, where w = angular velocity, theta = position angle, and t = time. Angular velocity is the rate of change of an object's position angle with respect to time.

Thus, An object's rate of rotation and direction of rotation are both described by its angular velocity.

It is customary for the positive direction to be in the counterclockwise direction. Here are some angular velocity issues for practice. The ratio of the angular displacement () to the time of motion, for a constant angular velocity, is the angular velocity.

Angular velocity only applies to things that are moving in a circular motion, making it less frequent than linear velocity.

A racecar on a circular track, a roulette ball on a wheel, or a Ferris wheel are a few examples of objects with angular motion.

Thus, An object's rate of rotation and direction of rotation are both described by its angular velocity.

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The heat transfer that happens through direct contact is known as  conduction. Correct option is A.

Conduction is the process through which thermal or electric energy is transferred as a result of the motion of particles. When an electric charge is involved, conduction is categorised as electrical conduction, and when thermal energy is involved, it is categorised as heat conduction.

Thermal energy often moves from quickly moving particles to slowly moving particles during their collisions in the process of heat conduction. Furthermore, thermal energy is frequently transferred between objects of different temperatures as well as between materials (particles) that are in close proximity to one another yet exhibit different electron-acceptance or electron-emission characteristics.

Any material or object that allows the conduction (transmission) of electrical charge or thermal energy is referred to as a conductor. Metal, steel, aluminium, copper, frying pans, pots, spoons, and other items are conductors.

In conclusion, the direct transfer of heat energy between two or more conductors, like a pot and an electric cooker, is a common example of conduction.

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To calculate the work done by the man to lift the package, we need to use the formula:

Work = force x distance x cos(theta), where force is the force applied by the man (250 N), distance is the distance the rope is pulled (10 m), and cos(theta) is the angle between the direction of the force and the direction of the displacement (in this case, it is 0 because the force is applied in the same direction as the displacement). The work done by the man to lift the package is then: Work = 250 N x 10 m x cos(0) = 2500 J. To lift the 1000 N package a distance of 2 m, the work done by the man must be equal to the work done against gravity, which is given by: Work = force x distance = 1000 N x 2 m = 2000 J. Therefore, the man's force of 250 N was sufficient to lift the 1000 N package a distance of 2 m, and he did 2500 J of work in the process.

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Aswan, Egypt is one of the hottest places on Earth in July because of its location in the Sahara Desert, which is known for its extreme heat.

Canada experiences much larger differences in temperature from January to July than Brazil due to its location in the Northern Hemisphere,

Aswan, Egypt is one of the hottest places on Earth in July because of its location in the Sahara Desert, which is known for its extreme heat. The desert is characterized by low humidity and clear skies, which allows the sun's radiation to heat the ground and air quickly.

Canada experiences much larger differences in temperature from January to July than Brazil due to its location in the Northern Hemisphere, which means it experiences the seasons in the opposite way to Brazil, which is located in the Southern Hemisphere. During the winter months in Canada (January), the days are shorter, the angle of the sun is lower, and there is less direct sunlight, resulting in colder temperatures.

Brazil, on the other hand, is closer to the equator and experiences relatively consistent temperatures throughout the year.  Therefore, Brazil does not experience the same large differences in temperature from January to July as Canada does.

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The truck's initial velocity can be calculated by using the kinematic equation v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration, and t is the time.

In this case, the truck's initial velocity is 0 m/s (since it starts from rest), the acceleration is \(-5.35 m/s^2\), and the time is 4.20 s. By substituting these values into the equation, we find that the truck strikes the tree with a speed of approximately -22.47 m/s.

Given that the truck slows down uniformly with an acceleration of\(-5.35 m/s^2\) for a time of 4.20 s, we can use the equation v = u + at to find the final velocity of the truck when it reaches the tree. Since the truck starts from rest (\(initial velocity u = 0 m/s\)), the equation simplifies to v = at.

Substituting the values, we have \(v = (-5.35 m/s^2)(4.20 s) = -22.47 m/s\). \(v = (-5.35 m/s^2)(4.20 s) = -22.47 m/s\)The negative sign indicates that the truck's velocity is in the opposite direction of its initial motion (due to the braking). The magnitude of the velocity is 22.47 m/s, which represents the speed at which the truck strikes the tree.

Therefore, the truck strikes the tree with a speed of approximately -22.47 m/s (or approximately 22.47 m/s in magnitude).

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