What is the internal resistance of an automobile battery that has an emf of 12.0 V and a terminal voltage of 18.2 V while a current of 4.20 A is charging it? Ω

Answer:

Thermal energy is an example of kinetic energy, as it is due to the motion of particles, with motion being the key. Thermal energy results in an object or a system having a temperature that can be measured. Thermal energy can be transferred from one object or system to another in the form of heat.

Explanation:

Answer:

Thermal energy is an example of kinetic energy, as it is due to the motion of particles, with motion being the key. Thermal energy results in an object or a system having a temperature that can be measured. Thermal energy can be transferred from one object or system to another in the form of heat.

Explanation:

Answer:

Explanation:

One of the biggest reasons why we haven't been able to harness power from fusion is that its energy requirements are unbelievably, terribly high. In order for fusion to occur, you need a temperature of at least 100,000,000 degrees Celsius. That's slightly more than 6 times the temperature of the Sun's core.

The required power with which it radiates electromagnetic waves is 1.80 W.

To find the power with which the solid iron sphere radiates electromagnetic waves, we can use the Stefan-Boltzmann law:

Power radiated = ε * σ * A * \(T^4\)

Given:

ε (emissivity) = 0.860

σ (Stefan-Boltzmann constant) = \(5.67*10^{-8} W/(m^2^.K^4)\)

Radius (r) = 2.00 cm = 0.02 m

Temperature (T) = 20°C = 293 K

First, calculate the surface area of the sphere:

\(A = 4\pi * r^2\)
   \(= 4\pi * (0.02 m)^2\)

Now, substitute the values into the formula to calculate the power radiated:

Power radiated \(= 0.860 * 5.67 * 10^{-8} * 4\pi * (0.02 )^2 * (293)^4\)

Power radiated = 1.80 W.

Thus, the required, power with which it radiates electromagnetic waves is 1.80 W.

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Answer

3ms^-2

_________

The time taken for the car's tires to complete one full rotation when it car drives down the road at 6m/s. The tires on the car have a diameter of .7m. is 0.37 s.

Time is the measure of the duration of past , present or future event.

To calculate the time taken for the tires to complete one full rotation, we use the formula below.

Formula:

Where:

Make t the subject of the equation

From the question,

Given:

Substitute these values into equation 2

Hence, The time taken for the car's tires to complete one full rotation is 0.37 s.

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Answer: frequency

Explanation:

amplitude is the max height at which the wave reaches
wavelength distance b/w two waves

the speed at which the wave is oscillating

frequency is no. of oscillations of  a wave per unit length

The panel is radiating 713,000 watts into its surroundings

The amount of power radiated by the panel can be found using the Stefan-Boltzmann Law, which is given by the equation P = εσAT⁴, where P is the power radiated, ε is the emissivity of the panel, σ is the Stefan-Boltzmann constant, A is the area of the panel, and T is the temperature of the panel.

Given that the area of the panel is 1 m² and the temperature is 500 K, we can plug these values into the equation to find the power radiated:

P = εσ(1 m²)(500 K)⁴

The emissivity of the panel is not given, so we will assume that it is 1, which is the emissivity of a perfect blackbody. The Stefan-Boltzmann constant is 5.67 × 10⁻⁸ W/m²K⁴, so we can plug these values into the equation to find the power radiated:

P = (1)(5.67 × 10⁻⁸ W/m²K⁴)(1 m²)(500 K)⁴

P = 7.13 × 10⁵ W

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Answer:

K = 5706.6 J

Explanation:

Given that,

The mass of a bullet, m = 50 g = 0.05 kg

The velocity of the bullet, v = 720 km/hr = 477.77 m/s

We need to find the kinetic energy of the bullet​. The kinetic energy of an object is due to its motion. It can be given by the formula as follows :

\(K=\dfrac{1}{2}mv^2\\\\=\dfrac{1}{2}\times 0.05\times 477.77 ^2\\\\K=5706.6\ J\)

So, the required kinetic energy of the bullet is equal to 5706.6 J.

Answer:

the ancer is c I know it because I had the same test or it might have been different but it looks familiar to me

Answer:Examples of input devices include keyboards, mouse, scanners, cameras, joysticks, and microphones.

pls mark brainliest

Explanation:

Answer:

Greater gravity compresses the gas, making it denser and hotter, so the outward pressure increases. In any given layer of a star, there is a balance between the thermal pressure (outward) and the weight of the material above pressing downward (inward). This balance is called hydrostatic equilibrium.

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.

Answer:

the final velocity of the car after 6 seconds of acceleration is 30 m/s.

Explanation:

The final velocity of the car can be found using the kinematic equation:

v = u + at

where u is the initial velocity (which is zero since the car starts from rest), a is the acceleration (which is 5 m/s^2), t is the time elapsed (which is 6 seconds).

Substituting the given values, we get:

v = 0 + 5 x 6

Answer: 4K1

Explanation:

Answer:

The work done on the box is 80 J.

Explanation:

Given that,

Weight of box = 40 N

Distance = 2 meter

We need to calculate the work done

Using formula of work done

\(W=F\times x\)

\(W=mg\times x\)

Where, x = distance

mg = weight

Put the value into the formula

\(W=40\times2\)

\(W= 80\ Nm\)

\(W=80\ J\)

Hence, The work done on the box is 80 J.

Queremos crear un diagrama general para calcular el área de un triangulo.

Este será algo como:

Como naturalmente habra algunas variaciones segun el programa que utilicemos, lo voy a escribir de forma bastante general.

Primero definamos nuestras variables:

Por ejemple, en fortran usariamos algo como:

real:: B, H, A

Donde B será la variable que usaremos para la base, H para la altura, y A para el área.

Luego tenemos que escribir en pantalla algo que le diga al usario que debe introducir la base y el area.

Luego el programa debe ser capaz de leer ese input.

con algo de la forma:

B = read*input 1

H = read*input 2

Una vez tenemos definidas las variables, simplemente calculamos el área del triangulo:

A = H*B/2

Finalmente la podemos mostrar en pantalla con algo como:

print(A).

Lo que nos mostraría el valor del área.

Concluyendo, el diagrama en general sería:

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48 m/s in terms of km/h is 720.8 km/h. In terms of m/min is 2880 m/min, in terms of km/s is 0.048 km/s and in terms of km/min is 2.88 km/min.

To solve this question, we need to understand some terms. The unit of velocity is measured in m/s. It can be expressed in different units of velocity.

1 km (kilometer) = 1000 meter

1 h (hour) = 3600 seconds

1 minutes = 60 seconds

To convert m/s into km/h,

48 m/s * 3600/1000 =  172.8 km/h

To convert m/s into m/min,

48 m/s * 60 = 2880 m/min

To convert m/s into km/s,

48 m/s ÷ 1000 = 0.048 km/s

To convert m/s into km/minutes,

48 m/s * 60 / 1000 = 2.88 km/min

Therefore, the 48 m/s expressed is 172.8 km/h, 2880 m/min, 0.048 km/s and 2.88 km/min.

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48 m/s is equivalent to  172.8 km/h, 2880 m/min, 0.048 km/s, and 2.88 km/minute.

To express 48 m/s in different units of velocity:

km/h (kilometers per hour):

To convert m/s to km/h, we can use the conversion factor of 3.6 since 1 m/s is equal to 3.6 km/h.

48 m/s * (3.6 km/h / 1 m/s) = 172.8 km/h

Therefore, 48 m/s is equivalent to 172.8 km/h.

m/min (meters per minute):

To convert m/s to m/min, we can use the conversion factor of 60 since there are 60 seconds in a minute.

48 m/s * (60 m/min / 1 s) = 2880 m/min

Therefore, 48 m/s is equivalent to 2880 m/min.

km/s (kilometers per second):

Since 1 kilometer is equal to 1000 meters, to convert m/s to km/s, we divide the value by 1000.

48 m/s / 1000 = 0.048 km/s

Therefore, 48 m/s is equivalent to 0.048 km/s.

km/minute (kilometers per minute):

To convert m/s to km/minute, we first need to convert m/s to km/s (as calculated in the previous step) and then multiply by 60 to convert seconds to minutes.

0.048 km/s * 60 = 2.88 km/minute

So, 48 m/s is equivalent to 2.88 km/minute.

Hence, 48 m/s is equivalent to approximately 172.8 km/h, 2880 m/min, 0.048 km/s, and 2.88 km/minute.

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As per the given statement the max height attained by the second marble is 16 times of the max height of the first marble with the velocity of 4v.

It can be defined as the rate of change of the object's position with respect to a frame of reference and time. Its S.I unit is m/s.

To calculate the max height attained by the second marble we use the following formula

\(\frac{1}{2}\)m\(v^{2}\)=mgh

Rearranging the equation, we get

h=\(v^{2}\)/2g

For the first ball,

\(h_{1}\)max=\(v^{2}\)/ 2g

acc. to the given data

Initial velocity of first marble= v

and height attained = h

For the second ball,

Initial velocity of second  marble= 4v

So attained height is?

h2max=v22 /2g

h2max=(4v)2/2g

h2max=16v2/2g

h2max=16×v2/2g                      now (h1max=v21/ 2g)

h2max=16×h1max

The max height of the second marble is 16 times of the max height of the first marble with 4v velocity.

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The converted unit from mile per hour to feet per second is 71.87 ft/s.

We need to know about unit conversion to solve this problem. The unit conversion can be used to convert a unit to another unit. It can be defined as

a = xb

where a is unit a, b is unit b and x is the constant of conversion.

From the question above, we know that

v = 49 miles/hour

1 mile = 5280 ft

By substituting the given parameters, the converted unit is

v = 49 miles/hour

v = 49 x (5280 ft) / (3600 s)

v = 49 x 1.47 ft/s

v = 71.87 ft/s

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Equation describes the connection between a mass-spring system's input force and output velocity, m(d^2x/dt^2) + b(dx/dt) + kx = f(t).

The relationship between the input force and the output velocity of a mass-spring system is given by the equation m(d^2x/dt^2) + b(dx/dt) + kx = f(t), where m is the mass of the object, b is the damping coefficient, k is the spring constant, x is the displacement of the mass from its equilibrium position, and f(t) is the input force as a function of time.

Thus, the relationship between the input force and the output velocity is mediated by the mass, spring constant, damping coefficient, and displacement of the system.

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The timescale had to be changed to microseconds to accurately measure the conduction velocity of electrical impulses in neurons, which is on the order of milliseconds, as the conventional unit of seconds is too large.

Velocity is a physical quantity that describes the rate at which an object's position changes with respect to time. In other words, velocity is the speed and direction of motion of an object. The standard unit of velocity is meters per second (m/s) in the International System of Units (SI).

Velocity is a vector quantity, which means that it has both magnitude (the speed of an object) and direction. The magnitude of velocity is simply the speed of the object, while the direction of velocity is given by a vector that points in the direction of motion.

In physics, velocity plays an important role in understanding the behavior of objects in motion, including the motion of particles, fluids, and waves. Velocity is also a key factor in many everyday applications, such as transportation, sports, and engineering. For example, knowing the velocity of an airplane is crucial for determining how much fuel it will consume and how long it will take to reach its destination.

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Answer:

30N in the direction the 45N acts.

Explanation:

Fnet = F1 + F2 (the vector sum of the forces)

Assigning a positive direction to the 45N force and a negative direction to the 15N force gives:

Fnet = 45 - 15

Fnet = 30N

Since the answer is positive, it is in the direction the 45N force acts.

Theres no screen shot here so I can't help.

a) Given that the Hill function is (R+a) · (v + b) = b(Ro + a)Here, R = resistance, Ro = maximal resistance, v = cadence, a, b are constantsGiven, maximal resistance, Ro = 75 Newtons,Resistance, R = 0, cadence, v = 180 rpmResistance, R = 10 Newtons, cadence, v = 100 rpmWe have to calculate a and b.For R = 0, v = 180, 10a + 180b = 75b, and b = (10a/−100 + 9/2)For R = 10, v = 100, 20a + 100b = 750 − 75

a.Substitute the value of b in the above equation.20a + 100(10a/−100 + 9/2) = 750 − 75a20a − 10a + 450 = 750 − 75a10a = 300a = 30Substitute the value of a in the equation (10a/−100 + 9/2) = b(10/−100 + 3/2)b = 15/16Therefore, the value of a is 30 and the value of b is 15/16. Hence, we got the value of a and b.b) Here the Hill function is (R+a) · (v + b) = b(Ro + a)Substituting the value of a and b in the equation, we get (R + 30) (v + (15/16)) = (15/16)(75+30)R + 30 = (15/16)105R = (105(v + (15/16)) − 2475)/15R = (7(v + (15/16)) − 165)/15

Therefore, the formula for R as a function of v is given by R = (7(v + (15/16)) − 165)/15.c) Long-term behavior of R is the value of R when v approaches infinity. Thus, the limiting value of R when v approaches infinity is Ro, i.e. 75 Newtons. Thus, the long-term behavior of R is that as the cadence increases, the resistance approaches its maximal value. This behavior is meaningful in the context of a stationary bicycle since maximal resistance represents the level of physical resistance that a cyclist may face.

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Answer:

h = 0.25 [m]

v = 3.26 [m/s]

Explanation:

In order to solve this problem, we must remember that mechanical energy is defined as the sum of kinetic energy plus potential energy.

E1 = Ek + Ep

where:

E1 = mechanical energy = 25 [J]

Ek = kinetic energy = 17 [J]

Ep = potential energy [J]

25 = 17 + Ep

Ep = 8 [J]

Now the potential energy is defined by the following equation:

Ep = m*g*h

where:

m = mass = 3.2 [kg]

g = gravity acceleration = 9.81 [m/s²]

h = elevation [m]

8 = 3.2*9.81*h

h = 0.25 [m]

The velocity can be calculated by means of kinetic energy.

\(E_{k} =\frac{1}{2} *m*v^{2}\\17 =\frac{1}{2} *3.2*v^{2} \\v= \sqrt{\frac{17*2}{3.2} }\\v = 3.26[m/s]\)

(a) The height of the ball will be h=0.25 m

(b) The speed of the ball will be \(V= 3.26\ \frac{m}{s}\)

It is given that

Mass of the ball m=-3.2kg

The kinetic energy of the ball = 17 j

The total mechanical energy of the ball = 25 J

(a) So the total mechanical energy is the sum of the kinetic energy of the ball and the potential energy of the ball.

\(E_T=E_{KE}+E_{PE}\)

Now putting the values of the KE and the Total energy we get

\(25=17+E_{PE}\)

\(E_{PE}=8 \ J\)

Now the formula of the potential energy will be

\(E_{PE}=mgh\)

\(8=3.2\times 9.81 \times h\)

\(h= \dfrac{8}{3.2\times 9.81}\)

\(h=0.25\ m\)

(b) Now to find out the speed of the ball we have

\(E_K=17\ J\)

\(E_K=\dfrac{1}{2} mv^2\)

\(v=\sqrt{\dfrac{2E_{KE}}{m} }\)

\(v=\sqrt{ \dfrac{2\times17}{3.2} }=3.25\)

\(v=3.25 \ \dfrac{m}{s}\)

So the calculated answers will be

(a) The height of the ball will be h=0.25 m

(b) The speed of the ball will be \(V= 3.26\ \frac{m}{s}\)

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Answer: answer is in explanation

Explanation:

A doorknob - about 10cm for diameter and the force that causes the torque comes from the person turning the doorknob causing friction. It’s used to open and close doors.

A screwdriver- 2m for diameter and the force that causes the torque comes from the person applying pressure and causing the screwdriver to turn with friction. It’s used to screw a screw into the wall or into an object.

Car wheels- about 12inches in diameter and the force that causes the torque comes from the engine’s chemical force and friction against the road. They’re used to make a car go and stop.

Electric fan- 14 inches in diameter and the force for torque comes from the electricity circulating from the fan making it spin to provide the air coming out of the fan. They’re used to provide people with air as a cooling system.

Pizza cutter- 10cm in diameter and the force for torque comes from the pressure being applied on the handle and the friction between the pizza and the pizza cutter. They’re used to cut pizza.

Winch

Analog clock

Windmill

Water wheel

Skateboard

The different types of wheels that we see very often is doorknob, screwdriver, cartwheels, an electric fan and pizza cutter.

The rotatable counterpart of linear force in mechanics and engineering is torque. Depending on the context of study, it is also known as a moment, point in time of force, rotating force, or turning effect.

A doorknob with a diameter of around 10 cm creates the torque because of friction created by the person twisting the doorknob. Doors are opened and shut with it.

A screwdriver with a diameter of 2 meters produces a torque when someone applies pressure, making the screwdriver turn against resistance. It is employed to fasten a screw to a surface or an item.

Car wheels are roughly 12 inches in diameter, and the torque is produced by the chemical force of the engine and friction with the ground. They are utilized to start and stop vehicles.

Electric fan with a 14-inch diameter; the energy running through the fan causes it to spin, producing the air that flows from the fan. They serve as a conditioning system by providing air to individuals.

Pizza cutter, diameter 10 cm; torque produced by the resistance between the pizza as well as the pizza cutter, as well as pressure applied to the handle. The pizza is cut using these.

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Answer:

When metals react with non-metals, electrons are transferred from the metal atoms to the non-metal atoms, forming ions. The resulting compound is called an ionic compound.

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