Box A has a mass of 7.0 kg, box B has a mass of 15.0 kg and there is an applied force of 42 N

The Earth's temperature is ultimately controlled by atmospheric carbon dioxide, which functions as a thermostat. the quick rise in carbon dioxide levels in the atmosphere brought on by industrial activities.

The Earth's greenhouse effect is mostly caused by water vapor and clouds, but a recent atmosphere-ocean climate modeling research reveals that the amount of carbon dioxide in the atmosphere is ultimately what determines the planet's temperature.

When trying to comprehend Earth's climate, it's also a good idea to start with the distance between Earth and the Sun. Although it is not the only one, it is the primary factor controlling the planet's average temperature.

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The complete Question is :

Which of the following can act like a long-term "thermostat" for the earth's average temperature?

A. average daily temperature

B. degrees in Fahrenheit

C. the carbon dioxide cycle

The time taken for the car to reach the given speed is 3.2 seconds.

The time of motion of the car is determined from the acceleration of the car which is calculated by applying Newton's second law of motion.

Mathematically, the formula for Newton's second law of motion is given as;

F (net) = ma

where;

The acceleration of the car is calculated from the net force acting on the car.

F (net) = F - Ff

where;

F (net) = 38,900 N - 34,000 N

F (net) = 4,900 N

Now, the acceleration of the car is calculated  by applying Newton's second law of motion as shown below;

a = F (net) / m

a = ( 4,900 N ) / ( 745 kg )

a = 6.58 m/s²

The time of motion of the car is calculated by applying the first kinematic equation as shown below.

v = u + at

where;

v = 0 + at

v = at

t = v / a

t = ( 21 m/s ) / ( 6.58 m/s² )

t = 3.2 s

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At constant speed, the Bird takes 40 hours.

1800/45 = 40

We know that,

Speed = Distance traveled/time

Speed = 45miles/hr.

Distance traveled = 1800 miles.

Time = ? or x.

Since the unit of distance and speed are same we do need to convert anything. Hence, we can substitute the values directly.

we get,

Speed = Distance traveled/ time.

45= 1800/x.

then,

x= 1800/45

x= 40.

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Answer:

64.8 km

Explanation:

speed = distance/time

Distance = speed x time

(81 km)(1000 m/km) = 81,000 m

1 hr = 60 min

Distance = (81000 m/60 min)(48 min) = 64800 m = 64.8 km

The correct statement is D. The magnitude of the electric force exerted on B is doubled because the electric field at the position of A is doubled.

When two charged particles, such as A and B, are held some distance apart, they exert an electric force on each other due to their charges. The strength of this force is determined by the amount of charge on each particle and the distance between them. This force is called Coulomb force and it follows the Coulomb's law. The Coulomb's law states that the force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

When the charge on A is doubled, the electric field at the position of A increases, and as a result, the force exerted on B also increases. This is because the electric field at the position of A is what causes the force on B. The magnitude of the electric force on B is proportional to the product of the charges of A and B, and inversely proportional to the square of the distance between them. So as the charge on A doubles, the force on B also doubles.

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The concentration of D+ and OD- ions for pure (neutral) D₂O is calculated to be [D+] = [OD-] = 2.98 × 10⁻⁸ M.

Given that,

Kw = 8.9 × 10⁻¹⁶

where, Kw is the equilibrium constant for the autoionization of water.

D₂O when undergoes ionization, it splits into D+ and OD- ions.

Kw can be written as,

Kw = [D+] [OD-] = x²

So, x = √(Kw) = √(8.9 × 10⁻¹⁶) = 2.9832 × 10⁻⁸ M

Thus, the required concentration of both the ions is equal and its value is equal to [D+] = [OD-] = 2.98 × 10⁻⁸ M.

The question is incomplete. The complete question is 'Deuterium oxide (D2O, where D is deuterium, the hydrogen-2 isotope) has an ion-product constant, Kw, of 8.9 x 10^-16 at 20 *C (degrees Celsius). Calculate [D+] and [OD-] for pure (neutral) D2O at this temperature.'

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Answer:
In Newton's Cradle Demonstration, converts the potential energy of one ball into kinetic energy, which is passed down the line of other balls and results of swinging the last ball upward.

Explanation:
The balls in the middle do not swing, they do move, however, because they absorb some of the kinetic energy from the left swinging ball.

The right side exterior ball moves out but not with 100% of the kinetic energy, it receives less than 100% due to interference. However, energy is transferred from the outside left swigging ball to the opposite right end ball which then swings away.

The balls that are touching in the middle cannot conduct 100% of the kinetic energy. Then additionally, gravity affects the right side swinging ball so that the kinetic it does receive through transference is affected by gravity resistance and air resistance. Thus, it swings out with less energy momentum than the left side swinging ball had coming down.

Answer:

The charge would be +1

Explanation:

Because Na is in the first group of the periodic table, one valence electron will be removed. Therefore, it will have a charge of +1.

The right answer is (d). Static friction can cause a system to do positive, negative, or even zero work.

Does static friction ever produce zero work?

At essence, static friction can also be active when a body is in equilibrium, when there is no movement and no static frictional work to be done.

Can static friction provide useful results?

This is because our force is opposed by the force of static friction. However, since the block stays there, there is no displacement. Therefore, friction produces no work. Friction can therefore produce positive, negative, or no work.

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The electric potential in a region of space varies as v=by/(a2+y2) is derived to be (y2-a2)b/(a2+b2)^2.

Electric potential is the effort required to transport a unit charge from one point to another in the presence of an electric field.

Electric potential = E => dV/dx

                            E(x)  => d(by/a2+y2)/dx =>0

                           E(y)   => d(by/a2+y2)

                                   => (y2-a2)b/(a2+b2)^2

Maxwell's equations show that there is indeed an electric field in empty space. Maxwell was the first to demonstrate that the propagation speed of electromagnetic waves is comparable to that of light speed, leading to the conclusion that visible light and EM waves are identical.

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A concave mirror is also known as converging mirror because it converges the incident rays parallel to the principal axis to the focus of the mirror after reflection. Concave mirrors reflect light inward to one focal point

A concave mirror has an inward-curving reflective surface that faces away from the light source. Light is reflected inward by concave mirrors to a single focus point. Unlike convex mirrors, a concave mirror's created image exhibits a variety of picture types based on the object's distance from the mirror.

A concave mirror has an inward-curving reflective surface that faces away from the light source. Light is reflected inward by concave mirrors to a single focus point. Unlike convex mirrors, a concave mirror's created image exhibits a variety of picture types based on the object's distance from the mirror.

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The work done in kicking the ball is 1173 J and the net force is 36.70 N. Then the displacement of the soccer ball is 31.9 m.

Force is an external agent acting on an object to change its motion or to deform it. When a force applied on an object results in a displacement, it is said to be work done on the object.

Work done = F.ds

The power in a process is the product of work done and time.

Given that, power P = 2229 W

time = 1.9 s

work done = P/t = 2229 W/1.9 s = 1173 J

Then net force = 64 sin 35 = 36.70 N

displacement = work done/ force

   = 1173 J / 36.70 N = 31.9 m

Therefore, the displacement of the soccer ball is 31.9 m.

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Free body motion with force and friction describes in Newton's second law

When a body is in motion with a force and friction, the motion of the body is described by Newton's second law, which states that the acceleration of an object is dependent on the net force applied to it and the mass of the object.

This means that the motion of the body is determined by the sum of all forces acting on it.

This includes both the force applied to the body, as well as the friction forces opposing it. In order for the body to remain in motion, the force applied must be greater than the friction forces acting against it.

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The torque produced by a motor overload that pulls the rotor out of synchronization is referred to as synchronous torque.

Torque is nothing but the measure of force which causes an object to rotate about an axis.

A rotor is a moving component in the electric motor.

It is the type of torque acting on the shaft of a synchronous machine when the rotational speed of the rotor deviates from the synchronous speed by keeping the machine in synchronism.

The pull out torque is the maximum value of torque that allows a synchronous motor to remain in synchronism without pulling out of synchronism.

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Answer:

2264 N

Explanation:

Because the apparent weight of an object when it is submerged in water is equal to its actual weight minus the weight of the volume of water that it displaces.

The weight of the object is 1400 kg x 9.81 m/s² = 13 774 N.

The volume of the box is 2.00 m x 3.00 m x 0.200 m = 1.20 m³

The weight of the water displaced is 1.20 m³ x 1000 kg/m³ x 9.81 m/s² = 11 510 N

Therefore, the apparent weight of the box when submerged in water is 13 774 N - 11 510 N = 2264 N.

Part A: The molar specific heat at constant volume for a mixture of gases can be calculated using the formula:

Cv,mixture = (n1Cv,monatomic + n2Cv,diatomic) / (n1 + n2)

where Cv, monatomic, and Cv, diatomic are the molar-specific heats at constant volume for the monatomic and diatomic gases, respectively.

Part B: If n1 = 0, the expression simplifies to Cv,

mixture = (0Cv,monatomic + n2Cv,diatomic) / n2 = Cv,diatomic. Similarly, if n2 = 0, the expression simplifies to Cv,mixture = (n1Cv,monatomic + 0Cv,diatomic) / n1 = Cv,monatomic.

This shows that the expression behaves as expected by approaching the molar-specific heat at the constant volume of one of the gases as the number of moles of the other gas approaches zero.

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About 4.5 billion years ago, a dense cloud of interstellar gas and dust gave rise to our solar system. The supernova shockwave from a nearby exploding star, or supernova, may have caused the cloud to collapse.

Within the initial 10 million years of the solar system's formation, Jupiter and Saturn are assumed to have formed first and fast. Rocky planets start to develop in the warmer, star-closer regions of the disk. There isn't much gas left for the terrestrial planets to accrete after the formation of the icy giants.

Let's, therefore, travel back in time more than 4.6 billion years to the time before Earth, Sun, and even Solar System existed. We were surrounded by gas and dust, most likely in one of the spiral arms. Do you want to know how it appeared? Your favorite Hubble Space Telescope images should be helpful.

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Our solar system was created from a massive cloud of interstellar gas and dust some 4.5 billion years ago. The collapse of the cloud may have been triggered by the supernova boom from a nearby exploding star.

Jupiter and Saturn are believed to have formed initially and quickly during the first 10 million years of the solar system's creation. In the warmer, star-closer parts of the disc, rocky planets begin to form. After the development of the icy giants, there is not much gas left for the terrestrial planets to accrete. Therefore, let's go back in time more than 4.6 billion years to the period before the Earth, Sun, and even the Solar System were created. Dust and gas were all around us called supernova.

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The correct option is the third option that is we integrate the negative of the electric field along a path from i to f.

We can find the electrostatic potential at any point due to each individual charge by considering the other charges absent. We then add all the charges algebraically. Hence, the electric potential at a point due to a group of point charges is the algebraic sum of all the potentials due to individual charges. To find the change in the electric potential from point/to point f, we have the following options a. We find the ratio of the electric field to the distance between the points. b. We find the ratio of the distance between the points to the electric field. c. We integrate the negative of the electric field along a path from i to f. d. We integrate the negative of the electric field along a path from f to i. e. We differentiate the electric field with respect to distance along the path from i to f. Hence with this information we can consider that the correct option is the third option that is we integrate the negative of the electric field along a path from i to f.

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i. The speed of the ball immediately before it hits the ground is 10 m/s

ii. The time after the release of the clay blob is 1 s

iii. The height above the ground is 5.0 meters

iv. The speeds of the ball and the clay blob immediately before the collision are 10 m/s and 20 m/s respectively

v. The magnitude and direction of their velocity is (910 + m20)/(9+m) with upward directions.

The speed of the ball immediately before it hits the ground can be determined using the equation:

v^2 = u^2 + 2as

where v is the final velocity, u is the initial velocity (0 m/s), a is the acceleration due to gravity (10 m/s^2), and s is the distance fallen (5.0 meters).

Substituting these values in gives:

v^2 = 0 + 2(10)(5) = 100

v = sqrt(100) = 10 m/s

The time after the release of the clay blob at which the collision takes place can be determined using the equation:

s = ut + (1/2)at^2

where s is the distance fallen (5.0 meters), u is the initial velocity (0 m/s), a is the acceleration due to gravity (10 m/s^2), and t is the time.

Substituting these values in gives:

5 = 0 + (1/2)(10)t^2

t = sqrt(5/5) = 1 s

The height above the ground at which the collision takes place is the same as the initial height, H = 5.0 meters.

The speeds of the ball and the clay blob immediately before the collision can be determined using the equations:

v = u + at

where v is the final velocity, u is the initial velocity (0 m/s), a is the acceleration due to gravity (10 m/s^2), and t is the time.

For the ball, t = 1 s and v = 10 m/s

For the clay blob, t = 2 s and v = 20 m/s

Since the collision is perfectly elastic, the total momentum before the collision is equal to the total momentum after the collision, and the kinetic energy before the collision is equal to the kinetic energy after the collision.

The magnitude and direction of their velocity immediately after the collision is the same as their center of mass velocity,

vcm = (m1v1+m2v2)/(m1+m2) = (910 + m20)/(9+m) and it is directed upwards.

Therefore, the correct answers are as given above.

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Applying the momentum principle, v = 0.08 m/s.

The Momentum Principle controls how a system moves. This theory explains how a system modifies its motion in response to a net force. We note that there is no net force acting on objects moving in a straight path at constant speed.

p = m v . The equation demonstrates that momentum is directly related to an object's mass (m) and velocity (v). As a result, an object's momentum increases with increasing mass or velocity. The momentum of a large, swift object is larger than that of a small, slower object.

80 kg for the quarterback and 0.43 kg for the ball.

initially both together, but with a horizontal velocity of zero.

Final momentum is equal to 15*0.43 - 80v starting momentum (law of conservation of momentum)

6.45 = 80v

v = 0.08 m/s

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Answer:

mature stage

Explanation:

This is the stage where.percipitation falls and a downdraft occurs it's the most active be stage hence thunder, lighting and hail

occur

To solve this we must be knowing each and every concept related to velocity. Therefore, the missing terms we have to know is the initial velocity, distance and time taken.

It is a vector assessment of an object's rate of motion and direction of motion. As a result, in order to calculate velocity using this definition, we must be familiar with both magnitude and direction.

The original velocity V₁ = 27 m/s, and press the brakes and the car has an acceleration a = -8.4 m/s2 (the sign - indicates that the acceleration vector in the opposite direction of the velocity vector of the car). The missing terms we have to know is the initial velocity, distance and time taken.

Therefore, the missing terms we have to know is the initial velocity, distance and time taken.

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Answer:

Distance = 425 m

Displacement = 125 m

Explanation:

Distance =  total length traveled =  150 m + 275 m = 425 m

Displacement =  distance from point of origin (school) to end point (street corner) = 275 m - 150 m = 125 m

Note:  You walk to the gas station, turn around and walk in a straight line back to school then another 125 m to the street corner

The evidence that newton's third law applies to electrostatic forces is given by Coulomb's law.

     b). The electric force is a repulsive force if the particles or both charges are positively or negatively charged. Charges oppose one another (like forces).

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The evidence observed from Newton's third law is that the electrostatic force of attraction exerted by two different charges will be equal in magnitude by acting opposite direction.

Newton's third law states that action and reaction are equal and opposite.

For different charges, say a positive charge (+ Q) and negative charge (-Q), the force of attraction exerted by both charges is equal and opposite.

   let the positive charge, +Q = Q₁

   let the negative charge, -Q = Q₂

From Coulomb's law, the force of attraction the two charges will exert on each other is equal and can be calculated as follows;

Thus, the evidence observed from Newton's third law is that the electrostatic force of attraction exerted by two different charges will be equal in magnitude by acting opposite direction.

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Answer:
Distance traveled by the car during the 4th second is 120 meters.

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Explanation:

To find the distance traveled by the car during the 4th second, you need to know the acceleration of the car. The acceleration is the change in velocity (in this case, the change in speed) over time. Since the car's speed increased from 20 m/s to 40 m/s in 10 seconds, the acceleration is (40-20)/10 = 2 m/s^2.

To find the distance traveled during the 4th second, you can use the formula d = vt, where d is the distance traveled, v is the velocity (in this case, the average velocity during the 4th second), and t is the time traveled (in this case, 4 seconds).

The average velocity during the 4th second is simply the average of the initial and final velocities, which is (20+40)/2 = 30 m/s. Plugging this value into the formula, we get d = 30 m/s * 4 s = 120 meters. Therefore, the distance traveled by the car during the 4th second is 120 meters.

Given,

u=8 m/s

v=16 m/s

t=10 sec

(i) using equation

a= v-u/t

= (16-8)

= 8/10

= 0.8 / ms^2

= acceleration

(ii) Displacement

S = ut + 1/2 at^2

= 8×10+1/2×0.8× (10)^2

= 80 + 0.4 × 100

= ( 80 + 40) m

S = 120 m

The mass of the bus that accelerates from 10m/s to 15 m/s is 600 kg.

Mass is the quantity of matter a body contains.

To calculate the mass of the bus, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the mass of the bus is 600 kg.

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Answer:

A)  1200 W

Explanation:

First find I (current):

V = IR, so I = V/R

I = 120V/12Ω = 10 A

Now find P (power):

P = VI = (120V)(10A) = 1200 W

Undergraduate programs can be found in a variety of fields, including business, technology, science, and engineering, as well as medicine and the humanities. They normally run four years.

Courses in medicine and dentistry can be completed in up to five years. In China, there are 13 statutory categories of academic degrees, including those in economics, law, education, fine arts, history, science, engineering, and medicine. These categories include bachelor's, master's, and doctoral degrees. When they enter college, more and more Chinese students are opting to study abroad. However, Chinese parents believe that the Chinese educational system is the greatest in the world at the elementary, middle, and high school levels.

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A 700 kg car that has stalled is being pushed by a group of people. The final velocity of the car will be 2.28 seconds if they push with a net force of 200 Newtons for 8 seconds.

The change in momentum (Δp ) is defined as the change in the product of an object's mass and velocity. A force is required to change the momentum of an object. The momentum of the item may change due to the applied force, as well as its direction.

Any moving object can have momentum because momentum is defined as mass in motion. The impulse of an item is equal to its change in momentum. Impulse is defined as a force multiplied by a time period. Instead of being the same as momentum, impulse is the change in momentum of an object.

Impulse = Impulsive force x Impact time

Impulse = 200N x 8s = 1600Ns

To calculate final velocity of car,

Impulse = change in momentum

1600 = 700 (v-0)

1600 = 700v

v = 1600/700

v = 2.28 m/s

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Answer:

1800W

Explanation:

A TV requires a potential difference of 11.5V and a current of 10A. It uses a transformer to produce the correct potential difference from the mains supply. If the mains supply is 230V, what current does it provide to the transformer? The required electrical power output of a step-up transformer is 1800W.