if an object doubles its luminosity in 10 hours, how large can the emitting source of light be?

The magnitude of the vertical force applied by the support at the right end of the bottom beam is -(F_weight).

To determine the magnitude of the vertical force applied by the support at the right end of the bottom beam, we can use the principle of static equilibrium. This principle states that in a static system (one that is not accelerating), the sum of the forces and the sum of the torques must both be zero.

Since the beam is in static equilibrium, the sum of the forces acting on it must be zero. There are two forces acting on the beam: the weight of the beam, which acts downward, and the force applied by the support at the right end, which acts upward. The magnitude of the vertical force applied by the support can be calculated as follows:

F_support = -F_weight

where F_support is the magnitude of the force applied by the support and F_weight is the magnitude of the weight of the beam.

The weight of the beam is given by the equation:

F_weight = m × g

where m is the mass of the beam and g is the acceleration due to gravity (9.81 m/s²).

To determine the mass of the beam, we need to find the mass of the entire beam and then divide it by 2, since only half of the beam is resting on the bottom beam. The mass of the entire beam can be calculated using the equation:

m = ρ × A × L

where ρ is the density of the metal, A is the cross-sectional area of the beam, and L is the length of the beam.

Plugging the values for m, g, and F_weight into the equation for F_support gives us the following:

F_support = -(m × g) = -(F_weight)

Solving for F_support gives us the magnitude of the vertical force applied by the support at the right end of the bottom beam.

Note that this calculation assumes that the beam is uniform, meaning that its density, cross-sectional area, and length are constant along its entire length. If the beam is not uniform, additional calculations will be needed to determine the force applied by the support.

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The number of forces acting on the trailer is 2.

The number of forces acting on the truck is 2.

The forces on the system are not balanced

The mass of the system is 1,900 kg.

The magnitude of the net force on the system is 520 N.

The magnitude of the system's acceleration is 0.27 m/s².

The speed of the system is decreasing towards to the left.

The number of forces acting on the trailer is calculated as follows;

The number of forces acting on the truck is calculated as follows;

The net force of the system is calculated as follows;

F (net) = 420 N - (600 N + 340 N)

F (net) = - 520 N

The mass of the system = 1300 kg +  600 kg = 1,900 kg

The acceleration of the system is calculated as follows;

F (net) = ma

where;

a = F (net) / m

a = -520 / 1900

a = -0.27 m/s²

Thus, since the acceleration of the system is negative, the speed of the system is decreasing towards to the left.

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A solar cell is charging a battery, here electrical energy is converted into chemical energy.

Solar cells are semiconductor devices that utilize sunlight to generate energy. They go through the same manufacturing and processing steps as computer memory chips. The main component of solar cells is silicon, which absorbs the photons that the sun's beams emit. The method was first identified in 1839.

A photoelectric cell is a type of device whose electrical properties, such as current, voltage, or resistance, change in response to light. The foundation of photovoltaic modules, sometimes referred to as solar panels, are solar cells.

The photovoltaic effect, which underpins solar cell operation, states that when light of a specific wavelength is shone on semiconductors, free electrons are generated.

Here in the case of solar cell for charging the battery electrical energy is converted into chemical energy.

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The force exerted by Howard on the rope to make it move at a constant speed is 140.24 N.

The force that Howard must exert on the rope to move at a constant speed is calculated by applying Newton's second law of motion as follows:

F - Ff = ma

F: the applied force

Ff: the frictional force

m: the mass of the crate's mass

a: the acceleration of the crate (at a constant speed, acceleration: a = 0)

F = Ff

F = μmg

Given in question

F = μmg

F = 0.159 x 90 x 9.8

F = 140.24 N

Then the force Howard exerts on the rope to move at a constant speed is 140.24 N

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Answer:

3.1 m/sec

Explanation:

The contained in the flying bag of rice is applied to the stationary cart.  Lets calculate the kinetic energy of the flying bag of rice.  Kinetic energy (KE) is given by KE = (1/2)mv^2, where m is the mass and v is the velocity.

[Note:  a kg*m^2/s^2 is 1 Joule]

KE(rice bag) = (1/2)(8.5kg)(5.5m/s)^2

KE(bag) =  129 Joules

When the bag hits the shopping cart, some of the energy tis transferred to the cart.  We aill assume no energy in lost in the collision (conservation of energy).  The kinetic energy is now contained in a body  with a total mass of 25.9 kg (rice bag plus cart).  

Use the kinetic energy expression again, using the same KE from the rice bag, but with a new mass.

KE = (1/2)mv^2

129 Joules = (1/2)(26.9 kg)v^2

 129 kg*m^2/s^2 = (1/2)(26.9 kg)v^2

v^2 = (129 kg*m^2/s^2)/(12.95 kg)

 v^2 = 9.96 m^2/s^2

 v = 3.12 m/s (3.1 m/2 with 2 sig figs)

3.12 m/s will be the velocity of the grocery cart and rice bag.    [That's 6.7 miles/hr, for the non-metric inclined]

the strength of the magnetic field within the toroid and at a distance of r from the toroid's axis

the magnitude of the magnetic field inside the toroid be

B(r)=[tex]\frac{\mu IN}{2\pi r}[/tex]

when only in [tex]r^{\cap}[/tex] any [tex]k^{\cap}[/tex] direction

B=[tex]\frac{\mu_{0} I }{2R}[/tex]

A magnetic field is a vector field that explains the magnetic influence on moving electric charges, electric currents, and magnetic materials. A force perpendicular to the charge's own motion and the magnetic field acts on it while the charge is traveling through a magnetic field. The magnetic field of a permanent magnet pulls on ferromagnetic elements like iron and attracts or repels other magnets. The three other magnetic effects of paramagnetism, diamagnetism, and antiferromagnetism also exert minute forces on "nonmagnetic" materials in a nonuniform magnetic field, albeit these forces are often so minute that they can only be measured by laboratory equipment. Electric currents, like those utilized in electromagnets, and electric fields that change over time produce magnetic fields that surround magnetized things.

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While there would be interference, the phase difference between the two sources would fluctuate and charge too quickly for you to see the pattern.

Young's double-slit experiment makes use of two coherent light sources that are spaced closely apart. Only a few orders of magnitude above the wavelength of light are typically employed. Young's double-slit experiment, which is illustrated by a figure, contributed to our knowledge of the wave theory of light. Since the pattern is made up of parallel straight-line-shaped fringes rather than the fringes of overlapping circles, Young's interference experiment with slits results in a crisper fringe pattern than with pinholes. Compared to the wider overlap of parallel straight lines, circles have relatively fewer portions of overlap.

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The critical value is ± 2.17 for a two-tailed test when α = 0.03.

As per the details share in the above question are as bellow,

The given details are as follow,

The two tailed test when the value of α = 0.03.

Use the z table.

We have to determine the critical value.

A mathematical table for the values of, implying the values of the normal distribution's cumulative distribution function, is known as a standard normal table. The Z-score, commonly referred to as the standard score, expresses how far away from the mean an object.

A crucial value is a point on the distribution of the null hypothesis' test statistic that designates a range of values that demand the null hypothesis be rejected. The critical or rejection zone refers to this collection. One-sided tests often have a single critical value, whereas two-sided tests typically have two critical values.

Now two tailed,

[tex]\alpha[/tex] =0.03

[tex]\alpha / 2[/tex] = 0.03 / 2 = 0.015

[tex]Z\alpha/2[/tex] = Z0.015 = ± 2.17( Using z table )

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The distance to the cosmological horizon depends on:

A. The age of the universe.

Distance is the numerical or every so often qualitative size of how some of the distance aside items or factors are. In physics, the distance may check with the physical duration or an estimation primarily based on other criteria.

The space between the two factors in the physical space is the period of an immediate line among them, that's the shortest feasible course.

It reduces the entire or a part of the arena to a small sheet of paper. At the same time of making a map, cartographers have to pay attention to properly constitute the distance between two locations.

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True, One coulomb is defined as the amount of charge that passes a point in a wire in 1 second when a current of 1 ampere is flowing through the wire.

An electric current is a circulation of charged particles, including electrons or ions, shifting through an electrical conductor or space. Its miles are measured because of the net fee of drift of electric fee through a floor or into a managed extent.

The current is one of the most important and essential elements within electric and electronic technology. The contemporary flowing in a circuit may be utilized in an expansion of ways from generating warmness to inflicting circuits to replace, or information to be saved in an included circuit.

Current is decided by the number of electrons passing through a cross-section of a conductor.

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Answer:

if g=-10m/s² then the normal force is 20N

if g=-9.8m/s² then the normal force is 19.6N

Explanation:

The force due to gravity (or weight) is mass times the acceleration due to gravity.

I am going to define up as positive so gravity will be negative.

On earth the acceleration due to gravity is -9.8m/s²

We sometimes round this to -10m/s² to make the math easier.

I will do it both ways.

so we have a mass of 2kg

2kg(-10m/s²)

so the force due to gravity is -20N

because the block is not falling through the table, the table must be pushing back with the same amount of force, but in the opposite direction so we change the sign.

using -10m/s² for g, we get a normal force of 20N (Newtons)

if we use -9.8m/s², we have 2kg(-9.8m/s²)

and a force due to gravity of -19.6N

and when we flip the sign we get a normal force of 19.6N

Hope this helps!

The function that can be used to find the velocity at the bottom of the pendulum released from the same angle for any period, p is v = π√(L/g). The correct option is B.

This equation can be used to calculate the velocity at the bottom of a basic pendulum (when it hits its lowest point). In the equation, v stands for velocity, L for pendulum length, and g for gravitational acceleration.

The length of the pendulum and the acceleration brought on by gravity both affect the velocity at the bottom of the pendulum.

We may determine the link between these variables by taking the square root of the ratio L/g, which leads to the right equation v = π√(L/g).

The velocity at the bottom of a pendulum launched from the same angle can be determined using this equation for any period, p.

Thus, the correct option is B.

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Your question seems incomplete, the probable complete question is:

which function can be used to find the velocity at the bottom of the pendulum released from the same angle for any period, p?

A) v = 2π√(L/g)

B) v = π√(L/g)

C) v = (2π√L)/p

D) v = (π√L)/p

Answer: (c) inertia

Explanation: Mass is directly proportional to inertia. Mass is not related to velocity, and the gravitational acceleration of all objects a given distance from the same massive body is the same. This is tricky, as the force of gravity (weight) is larger on heavier objects, but one must remember that weight is calculated by multiplying an object's mass by g. Option b is only considering g.

The horizontal velocity of the ball before it reaches the ground, where the initial velocity of 20 m/s from a 60m high tower, is 20m/s

Velocity is the directional speed of an object in motion as an indication of its rate of change in position as observed from a particular frame of reference and as measured by a particular standard of time.

From the question given

Initial horizontal verical velocity (ux) = 20 m/s

height of tower (h) = 60m

Basically, after the ball is thrown, it becomes a projectile. It means that the acceleration along the horizontal direction is ax = 0 m/s² over the whole motion.

Now, let's use the formula

Vx = Ux + ax * t

= 20 + (0 m/s²) * t

Vx = 20 m/s

Therefore, the horizontal velocity of the ball before it reaches the ground is 20 m/s.

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Answer:

In a tug of war, the forces applied by the two people on the rope must be equal in magnitude but opposite in direction. Therefore, if one person has twice the mass of the other, the person with the larger mass will experience twice the acceleration of the person with the smaller mass.

If the heavier person has twice the mass of the lighter person, and the two people meet after a brief time, it follows that the heavier person will have traveled twice as far as the lighter person. Since the rope is 12 meters long, and the two people meet at the center of the rope, the lighter person will have traveled half the length of the rope, or 12 / 2 = 6 meters. Therefore, the heavier person will have traveled twice this distance, or 2 * 6 = <<2*6=12>>12 meters.

Since the heavier person started from the same position as the lighter person, the distance that the heavier person slid is equal to half the total distance traveled, or 12 / 2 = <<12/2=6>>6 meters. Therefore, the correct answer is (A) 6 meters.

The m" = 0.389 Kg mass must be added to the object to change the period to 2.00 s

By applying the time period formula, it is possible to calculate that 0.389 kg of mass must be added to the item in order to shift the period to 2.00 s.

A mass hung from a spring and weighing 0.500 kg oscillates with a 1.50 s period.

where K is the spring constant and m is the mass.

where K is the spring constant, and m' is the final total mass following the addition. Subtract equation (1) from equation (2).

Now change the above statement with the known terms.

To find the value of m', simplify the statement above.

m' = 0.889 Kg

Now, we can calculate the mass that must be added to the object to make the period 2.00 s:

m" = 0.889 - 0.500

m" = 0.389 Kg

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They are little, but they usually need to be charged in to work. Within this tube, the flow of electrons occurs on its own.

The advantages of spontaneity. Instead of racing from one planned process to the next, it can be highly healthy for our mental health to be open to unplanned happenings and give our minds space to think.

People with spontaneous personalities tend to be somewhat unpredictable at work and like to act or say whatever feels right at the time. A stand-up comedian is a great example of someone who always seems to be able to take the punches and handle whatever come their way.

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According to   equations of motion, we get after 8.70 seconds  she running directly east.

These are the three equations:

Given :

v₀ = 2.38 m/s

v = 0 m/s

a = 0.310 sin (-62.0°) m/s²

to find time t :

v = at + v₀

0 m/s = (0.310 sin (-62.0°) m/s²) t + (2.38 m/s)

t = 8.70 s

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Upon calculation the change in entropy is found to be 244 J/K.

Entropy is a generic phrase that describes the trend toward disorder as well as the spontaneous changes that take place in everyday situations. Entropy is not only a term used in academia; it is also frequently characterized as a physical feature connected to uncertainty.

For a reversible process the change in entropy is given by:
S= [tex]\frac{dQ}{T}[/tex]

dQ= heat

T= temperature

The change in entropy when the temperature of ice comes to 273 K is:

S= [tex]\int\limits^{273}_ {261} \, \frac{dQ}{T}[/tex]

dQ= mcdT

m= mass of ice= 27.9 gm= 0.0279 kg

c= specific heat capacity= 2090 J/kg C

T= temperature

S=[tex]mc\int\limits^{273}_{261} \, \frac{dT}{T}[/tex]

S= 0.0279× 2090×㏑[tex]\frac{273}{261}[/tex]

S= 2.62 J/K

For conversion of ice into water dQ= mL

m= mass of ice

L= latent heat of fusion= 3.33 ×10⁵

S= [tex]\frac{mL}{T} =\frac{3.33* 100000*0.0279}{273}[/tex]

S= 34 J/K

Change in entropy when the water turns into steam is given by

S= [tex]\int\limits^{373}_{273} \, \frac{mcdT}{T} =mc ln\frac{373}{273}[/tex]

c= heat capacity of water= 4186

S= 0.0279× 4186×㏑[tex]\frac{373}{273}[/tex]

S= 36.5 J/K

Change in entropy at 373 K for steam is given by

S= [tex]\frac{dQ}{T} = \frac{mL}{T}= \frac{2.26*1000000*0.0279}{373} -=169 J/K[/tex]

Here L= 2.26×10⁶

Change in entropy for steam when it rises to a temperature 115 degree Celsius= 388K

S= [tex]\int\limits^{388}_{373} \, \frac{dQ}{T} =\int\limits^{388}_{373} \, \frac{mcdT}{T} =mc\int\limits^{388}_{373} \, \frac{dT}{T} = 0.0279*2010*ln\frac{388}{373} =2.21 J/K[/tex]

Adding all the entropies obtained in the cases we get

Total entropy= 2.62+34+36.5+169+2.21

S= 244J/K

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The magnitude of the force needed to keep the block moving at a constant speed is 60 N.

his is the same as the weight of the block. This is because the only force acting on the block is gravity. As the block is moving at a constant speed, the force of friction is equal to the force of gravity. This means that the magnitude of the force needed to keep the block moving is equal to the weight of the block, which is 60 N. To calculate this, we used the equation F = ma, where F is the force, m is the mass of the block, and a is the acceleration, which is 0 in this case. This gave us the equation F = m x 0, which is simplified to F = 0, meaning the magnitude of the force needed is 0, which is equal to the weight of the block, which is 60 N.

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The process of building a straightforward direct current (d.c.) electric motor.

It is made out of a rectangular coil of wire positioned on a spindle so that it can move back and forth between the curved poles of a permanent magnet in the shape of a U.

The coil's two ends are soldered to a copper split ring, also known as a commutator, and its two halves, respectively. When two carbon brushes are placed in circuit with a battery and rheostat, they are made to mildly press against the commutator by means of springs, which causes the coil to revolve.

Assume that when the current is turned on for the first time, the coil is in the horizontal position. According to Fleming's left-hand rule, current will travel through the coil in the direction depicted.

Therefore, The process of building a straightforward direct current (d.c.) electric motor.

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The average acceleration of the world class track sprinter is 3.66 m/s².

Initial distance = h₀ = 0 m

Final Distance = h = 19 m

Initial speed = u = 0 m/s

Final speed = v = 11.8 m/s

We use the kinematic equation of motion, to calculate the average acceleration;

= v² = u² + 2a ( h - h₀)

= a = v² - u² / 2  ( h - h₀)

= a = 11.8² - 0² / 2  ( 19 - 0 )

= a = 3.66 m/s²

Thus, the average acceleration of the sprinter is 3.66 m/s².

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The complete question:

a graph of v(t) is shown for a world-class track sprinter in a 100-m race. (see figure below). It can reach a top speed (of about 11.8 m/s ) in the first 19.0 m of a race. what is the average acceleration of this sprinter

The minimum work required to get the cylinder rolling without slipping at a rotational speed of 20 s-1 is 1.04 kg-m2/s2.

The torque required to rotate a solid cylinder without slipping is given by:

τ = Iα

Where I is the moment of inertia of the cylinder, and α is its angular acceleration.

The moment of inertia of a solid cylinder is given by:

I = mr2

Where m is the mass of the cylinder, and r is its radius.

Plugging in the values, we get:

I = (52 kg)(0.1 m)2 = 0.052 kg-m2

The angular acceleration is given by:

α = ω/t

Where ω is the angular velocity and t is the time taken to reach the desired angular velocity.

Plugging in the values, we get:

α = (20 s-1)/t

Since we do not know the time taken to reach the desired angular velocity, we will assume that it is 1 second.

Plugging in the values, we get:

α = (20 s-1)/1 s = 20 rad/s2

Now, we can calculate the torque required to rotate the cylinder without slipping:

τ = Iα = (0.052 kg-m2)(20 rad/s2) = 1.04 kg-m2/s2

Finally, we can calculate the minimum work required to get the cylinder rolling without slipping:

W = τθ

Where θ is the angular displacement. Since we do not know the angular displacement, we will assume it to be 1 radian.

Plugging in the values, we get:

W = (1.04 kg-m2/s2)(1 rad) = 1.04 kg-m2/s2

Hence, the minimum work required to get the cylinder rolling without slipping at a rotational speed of 20 s-1 is 1.04 kg-m2/s2.'

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Complete question:

A solid 52-kg cylinder has a radius of 0.10 m.What minimum work is required to get the cylinder rolling without slipping at a rotational speed of 20 s^−1?

It is estimated that an asteroid or comet impacts the Earth with sufficient energy to cause mass extinction about once every few hundred million years.

Mass extinction is an event in which a rapid and widespread decrease is happening to the biodiversity on Earth. In it, all or at least 75% of the world's species died at a much faster rate than they are replaced in less than 3 million years.

There are several things that can cause a mass extinction event, ranging from anoxia, climate change, and volcanism, human activity, to an impact caused by another celestial body, such as an asteroid or comet. Each cause has its own probability of happening.

It is most likely that the latest mass extinction, the Cretaceous-Paleogene extinction where most of the dinosaurs went extinct, was caused by a meteoric impact. It happened around 66 million years ago.

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The frequency of the first possible harmonic after the fundamental frequency in the open-closed pipe 428.75 Hz.

Calculation:-

A. L = 80 cm

= 0.8 m

V = 343 m/s ( sound speed in the air )

V1 = n V / 2 L

= 1 X 343 / 2 X 0.8

V1 = 214.375 Hz

B. using the above equation

Vf =  V / 2 L

[tex]Vf\alpha 1 / L[/tex]

so the new frequency is high than the previous or before.

C. Now L = L / 2 = 0.8 / 2

L = 0.4 m

Vn  = n V / 2 L

= 1 X 343 / 2 X 0.4

Vn  = 428.75 Hz

so the new frequency is 428.75 Hz

D. Vn  = n V / 2 L  

L  = L /2

Vn = 2 n V / 2 L  

Vn  = 2 n Vn

n  = 2n

Vn  = n' Vn

even multiples of the fundamental frequency

E. for open-closed pipe

fn  = n V / 4 L

and for an open- open pipe  

Vn = n V / 2 L

n V / 2 L  = n V / 2 L

2 L  = L

L  = L / 2

So half the length of open-open Pipe.

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The things which are going on in the centre of our own galaxy (the Milky Way), We cannot see the galactic centre with visible or ultraviolet light, but radio and X-rays from the centre can be detected.

The galaxy that contains our Solar System is known as the Milky Way, and its name refers to how it appears to us on Earth: a hazy strip of light in the night sky made up of stars that are too close together to be seen individually. The phrase Milky Way is a translation from Greek (galaktikos kklos), which means "milky circle," into Latin via lactea. The Milky Way is a disk-shaped structure, yet when viewed from Earth, it seems like a band. In 1610, Galileo Galilei used his telescope for the first time to separate the band of light into individual stars. Most astronomers believed that the Milky Way held all of the universe's stars until the early 1920s.

Observations by Edwin Hubble proved that the Milky Way is only one of many galaxies after the 1920 Great Debate between the astronomers Harlow Shapley and Heber Curtis.

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Option-d).  it remains the same because both are at the same temperature. If the temperature does not increase while the ice melts, the internal energy of the ice and water mixture changes.

A temperature is a unit of hotness or coldness that can be described in terms of a variety of arbitrary scales. It also indicates the direction in which heat energy will naturally flow, i.e., from a hotter body to a colder body (one at a lower temperature). Temperature is not the same as the energy of a thermodynamic system; for instance, an iceberg has a considerably higher temperature than a burning match, but it has a far larger total heat energy than a match. As opposed to extensive qualities like mass or volume, which are reliant on the amount of stuff being studied, the temperature is an intensive attribute, just like pressure or density.

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Two objects attract each other with a gravitation force of 3.80 x 10-8N when separated by a distance of 0.350 m. if the difference in masses is 7.50 kg, the mass of these objects is 2.1kg and 5.4kg

Given the mass of first object = m1

the mass of second object = m2

Gravitational force (Fg) = 3.80 x 10-8N

Objects separated by a distance (d) = 0.350m

Difference in mass of objects (m1-m2) = 7.50kg

Let mass of first object (m1) = 7.50+m2

The formula for gravitational force of attraction between two bodies is:

F = Gm₁m₂/d²

here G is the gravitational force constant and is equal to 6.67 * 10⁻¹¹ Nm²Kg⁻²

3.80 x 10-8N =  6.67 * 10⁻¹¹ Nm²Kg⁻² x (7.50+m2) x m2/( 0.350m)^2

46.55 x 10-10 / 6.67 * 10⁻¹¹  = m2^2+7.50m2

m2^2+7.50m2-69.7 = 0

m2 = 5.4 then m1 = 7.5-5.4 = 2.1

Hence the mass of first object is 2.1kg

The mass of second object = 5.4kg

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This is typical conduct. The air is dehumidified by turning on the A/C system, which defrosts the windshield. Without it, problems would arise as a result of your breath freezing on the inside of the windshield.

What is an AC system?

Air conditioning (often referred to as AC, A/C or air con) is a system used to cool down the temperature in an inside space by removing the existing heat and moisture from the room. Essentially, they work by taking warm air into a system and dispersing cold air, but there is much more to this process.

The different AC types are as follows: Central Air Conditioner. Ductless Mini-Split.

Central Air Conditioner.

Ductless Mini-Split.

Window Air Conditioner.

Portable Air Conditioner.

Floor Mounted Air Conditioner.

Smart Air Conditioner.

Geothermal Air Conditioning System.

Hybrid / Dual Fuel Air Conditioner.

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