ball is dropped in a vacuum (no air resistance). as it falls it loses 7 j of potential energy. how much kinetic energy

Answer:

(1)540 J

(2)67.5 J/s or 67.5W

(3)look at underline statement in explanation

Explanation:

(1) acceleration = change in speed ÷ time

= (9-5)m/s ÷ 8s

= 0.50 m/s²

resultant force of object during motion

= mass(in kg) × acceleration

= 6 × 0.50 = 3 N

displacement of force applied

= area under speed time graph(when sketched out, it's a trapezium)

= ½ × (5+9) × 8

= 180m

work done is measured in joules

= force × displacement of force applied

= 3N × 180m

= 540 J

detailed explanation:

altho the final unit for the work done should be Nm, but J is equal to Nm.

(2) Power is measured by J/s

therefore power = 540 J ÷ 8s = 67.5 J/s or 67.5 W

(3) the object accelerates constantly along a straight road

Answer:

The observer will say that galaxy 2 is moving away from galaxy 3 where he stands.

Explanation:

Since the galaxies are expanding, each one would move away from the others. Observers on all three galaxies have their frame of reference fixed on their own galaxies. Judging from their own galaxies, each observer will perceive the other galaxies moving away from his/or galaxy.

The observer at galaxy 3 will talk about galaxy 2 by doing is; he will say that galaxy 2 is moving far from him.

We are told that the universe is expanding and as such, the galaxies would be expanding and moving away from each other.

Since the galaxies are expanding, it means that they will be moving away from each other.

From time dilation principle, an observer at galaxy 3 will say that galaxy 2 is moving far from him.

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The electrical power supplied to the lamp is 100W when the p.d. across it is 24V and the current is 4.2 A.

Electrical power is the rate at which electrical work is done.

The unit of electrical power is Watts.

The experiment will require a 24V Battery, a Lamp marked 24V, 100 W, a key, wires, a rheostat, a voltmeter and an ammeter.

The circuit is completed and the rheostat is adjusted to provide until the voltmeter reads 24V.

The ammeter reading is taken as well.

When the voltmeter reading is 24V, it can be seen that' the ammeter reading for current is approximately 4.2 A.

Calculating, the power of the lamp:

Power = 24 × 4.2 = 100 W

Therefore, the electrical power supplied to the lamp is 100W when the p.d. across it is 24V and the current is 4.2 A.

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Answer:

it's gravitational potential energy would have converted to kinetic energy half way back when it's falls

Answer:

P = 1000000[Pa] = 1000 [kPa]

Explanation:

To solve this problem we must use the definition of pressure, which is equal to the relationship of force over area.

\(P=F/A\)

where:

P = pressure [Pa] (units of pascals)

F = force = 100 [N]

A = area = 100 [mm²]

But first we must convert the units from square millimeters to square meters.

\(A=100[mm^{2}]*\frac{1^{2} m^{2} }{1000^{2}mm^{2} } =0.0001[m^{2} ]\)

Now replacing:

\(P=100/0.0001\\P=1000000[Pa]\)

Answer:

Beta Particles

Explanation:

the new distance between the central and the second-order bright fringe, when the screen is moved 1.0 m further away, is approximately 9.92 m.

To solve this problem, we can use the equation for the location of bright fringes in the double-slit interference pattern:

y = (λL) / d

where:

y is the distance from the central bright fringe to the desired fringe (in this case, the second-order bright fringe),

λ is the wavelength of light,

L is the distance between the slits and the screen,

and d is the distance between the two slits.

Let's first calculate the distance between the slits using the given information:

λ = 520 nm

= 520 × \(10^{(-9)}\) m

L = 5.50 m

y = 8.40 cm

= 8.40 × \(10^{(-2) }\)m

Using the equation, we can rearrange it to solve for d:

d = (λL) / y

Substituting the values, we have:

d = (520 ×\(10^{(-9)}\) m × 5.50 m) / (8.40 × \(10^{(-2)}\) m)

d ≈ 3.40 ×\(10^{(-3)}\) m

So, the distance between the two slits is approximately 3.40 × 10^(-3) m.

Now, let's calculate the new distance between the central and the second-order bright fringe when the screen is moved 1.0 m further away: L' = L + 1.0 m = 5.50 m + 1.0 m = 6.50 m

Using the same equation, we can find the new distance:

y' = (λL') / d

Substituting the values:

y' = (520 × 10^(-9) m × 6.50 m) / (3.40 × 10^(-3) m)

y' ≈ 9.92 m

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The rank of the galaxies based on the speed with which each should be moving away from earth due to the expansion of the universe, from fastest to slowest are:

Galaxies are separating from one another in static space. As space enlarges, galaxies are relocating away from one another.

We may learn a lot about the nature of the cosmos from Hubble's law, which states essentially that a galaxy's velocity (or, as it is commonly displayed, its redshift) is precisely proportionate to its distance. The relationship between distance and velocity should not exist if the cosmos is constant and unchanging. According to Hubble's law, a galaxy gets larger the farthest it is from Earth.

Therefore, Hubble-Lemaître law, commonly referred to as Hubble's law, is the finding in physical cosmology that galaxies are eloping from Earth at rates proportionate to their separation. In other words, they are traveling away from Earth more quickly the more away they are.

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See full question below

The following figures give the approximate distances of five galaxies from Earth. Rank the galaxies based on the speed with which each should be moving away from Earth due to the expansion of the universe, from fastest to slowest.

- 800 million ly

- 2 billion ly

- 70 million ly

- 230 million ly

- 5 billion ly

Red giants are cooler and more luminous compared to main sequence stars due to their larger size and lower surface temperatures.

The comparison of temperature and absolute magnitude between red giants and main sequence stars can be explained as follows:

Red giants are cooler and more luminous than main sequence stars. The temperature of red giants is lower because they have expanded and cooled during their evolutionary process.

Their temperatures typically range from 3,000 to 4,000 Kelvin, resulting in a reddish appearance. Main sequence stars, on the other hand, have higher temperatures, ranging from 5,000 to 6,000 Kelvin, giving them a yellow-white appearance like our Sun.

In terms of absolute magnitude, red giants are more luminous than main sequence stars because their larger size enables them to produce more light, despite having a cooler surface temperature.

The absolute magnitude of red giants can be thousands of times greater than that of main sequence stars.

In summary, red giants are cooler and more luminous compared to main sequence stars due to their larger size and lower surface temperatures.

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After extensive, detailed calculation, contemplation, investigation, and consideration, my tentative guess is that the second choice is the correct one.

The answer is False. A polarized material does not need to have a nonzero net electric charge. Polarization occurs when the positive and negative charges within a material are displaced relative to each other, creating an electric dipole moment.

This can happen in materials such as dielectrics or insulators, which do not conduct electricity. The net electric charge of a polarized material can still be zero, as the overall positive and negative charges remain balanced, but the charges are spatially separated. Polarization plays an important role in phenomena such as capacitance, dielectric constant, and polarization-induced electric fields.

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The radius of the satellite's motion is 2.49 × 10⁷ m

Since the centripetal force, F = mv²/r equals the gravitational force, F' = GMm/r² on the satellite,

F = F'

mv²/r = GMm/r²

v² = GM/r

Making r subject of the formula, we have

r = GM/v² where r = radius of satellite's motion, G = universal gravitational constant = 6.67 × 10⁻¹¹ Nm²/kg², M = mass of earth = 5.972 × 10²⁴ kg and v = speed of satellite = 4,000 m/s.

Substituting the values of the variables into the equation, we have

r = GM/v²

r = 6.67 × 10⁻¹¹ Nm²/kg² × 5.972 × 10²⁴ kg/(4,000 m/s)²

r = 39.83324 × 10¹³ Nm²/kg ÷ 16 × 10⁶ m²/s²

r = 2.4895775 × 10⁷ m

r ≅ 2.49 × 10⁷ m

So, the radius of the satellite's motion is 2.49 × 10⁷ m.

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Answer:

25.0 million meters

Explanation:

The four major forces acting on the sled and the free-body diagram of the 4 major forces acting on the sled is attached below:

In physics and engineering, a free body diagram (FBD; also called a force diagram) is a graphical representation used to visualize the forces, moments, and resulting reactions applied to a body in a given state. expression. It represents a body or connected bodies that includes all applied forces, moments, and reactions acting on the body. A body can consist of several internal elements (such as a truss), or it can be a compact body (such as a beam). A series of free-body and other diagrams may be required to solve complex problems. A free body diagram consists of:

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Answer:

Explanation:

Given:

p = 110 kg·m/s

V = 2 m/s

___________

M - ?

Momentum

p = M·V

Mass

M = p / V = 110 / 2 = 55 kg

Answer:

The Answer is D!

Explanation:

I checked it on Khan Academy.

The correct free body diagram of the hanging carrot is option B, where, the forces from two ropes and the net force acting upward and the gravitational force acting downwards.

A free body diagram is a representation of a body with different kinds of forces acting upon it with respect to its position and direction.

There are different kinds of forces namely magnetic force, tension force, nuclear force, gravitational force and the normal force  etc. The force acting on a massive moving body will be the product of its mass and acceleration.

The direction of each force acting upon a body will be different and the displacement also. Here, the carrot hanged by the two ropes will experience forces from both ropes which hangs it down but the force acting is upwards and thus the net force  is upward.

The gravitational force Fg acting on a body is always downward and thus the correct diagram depicting the free body of the carrot with forces is option B.

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The greater impact force (in magnitude) acts on a) the car

Since , both the objects that is the car and a massive truck is coming and colliding with a certain speed , which means they are acquiring some momentum because of mass and speed , since they are coming with certain momentum when collided must have impacted each other.

Momentum is the measure of product of mass and velocity , if both of them are coming with same velocity then total dependency of impact will be on their masses  , since  truck is massive and car is small sports car , that means truck must have greater mass than the car , hence the greater impact force act on  a) the car

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Given parameters:

Mass of object = 6.7kg

Velocity  = 8m/s

Unknown parameter:

Kinetic energy  = ?

Energy is defined as the ability to do work. There are two forms of energy;

Kinetic and potential energy.

Kinetic energy is the energy due to the motion of a body. Whereas, potential energy is the energy due to the position of a body usually at rest.

Kinetic energy is mathematically expressed as;

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

where m is the mass of the body

           v is the velocity of the body

Since we have been given both mass and velocity, input the parameter to solve for the unknown;

            Kinetic energy  = \(\frac{1}{2}\) x 6.7 x 8²   = 214.4‬J

So the kinetic energy of the body is  214.4‬J

]The low-voltage control circuit for a typical residential air-conditioning system typically draws a maximum of 0.5 to 2 amperes (A) of current.

The low-voltage control circuit is responsible for controlling the operation of the air conditioning system, such as turning it on and off, adjusting the thermostat, and monitoring the system's performance. This circuit operates at a lower voltage than the high-voltage circuit that powers the air conditioner's compressor and fan motor.

The amperage drawn by the low-voltage control circuit in a typical residential air conditioning system is relatively low, typically ranging from 0.5 to 2 amperes (A). This is because the low-voltage circuit only needs to power small components such as relays, contactors, and thermostat sensors. In contrast, the high-voltage circuit that powers the compressor and fan motor requires much higher amperage, typically ranging from 15 to 50 amperes (A) depending on the size and capacity of the air conditioning system.

It's important to note that the exact amperage drawn by the low-voltage control circuit may vary depending on the specific make and model of the air conditioning system. However, most residential air conditioning systems have a low-voltage control circuit that draws a relatively low amount of current.

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Answer:

-9/6 is only rational.

Explanation:

-9/6 = -1.5

not an integer bc decimal

not irrational because it can be represented as a fraction

not a whole or natural number because its negative.

The time for the current iteration is up and one of the features isn't complete. Stop Working And Add The Incomplete Feature Back Into The Backlog.

In case a task couldn't be completed within the new launch, it's far great to feature it in the backlog so that in the next iterations it'll probably be finished giving it a priority, of direction. The current iteration, it isn't convenient to extend the new release time simply to complete the unfinished challenge. additionally, we ought to now not add it at once to the following new launch due to the fact we would be changing its shape. So the maximum appropriate thing to do is to depart it marked as a problem to be blanketed within the next iterations.

The movement or a system of iterating or repeating includes A technique wherein repetition of a series of operations yields consequences successively towards the desired end result.

The community becomes skilled by way of processing the current iteration of the entire training set. the lighting turned into also the issue of a computer simulation look at, with 5 iterations undertaken earlier than the final configuration of rooflight was determined.

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Answer:

True!

Explanation:

Hope this helps!

The measure that assesses media weight based on both reach and frequency is Gross Rating Points (GRPs).

GRPs are a metric commonly used in advertising and media planning to evaluate the impact and effectiveness of media campaigns. They quantify the total exposure or weight of a media plan by combining the reach (the percentage of the target audience reached by the campaign) and the frequency (the average number of times the target audience is exposed to the campaign).

GRPs are calculated by multiplying the reach percentage by the frequency. For example, if a campaign reaches 40% of the target audience with an average frequency of 3, the GRPs would be 120 (40% × 3 = 120).

Media mix (a) refers to the combination of different media channels used in a campaign. Share of voice (c) measures a brand's advertising presence relative to its competitors. Cost per thousand (CPM) (d) is a metric that calculates the cost of reaching one thousand individuals or households.

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Answer:

C) 0m

Explanation:

Since at the end of the day, it was not displaced

Displacement ti's a vector quantity

Answer: 0.28 A

Explanation:

Answer:

A. the matter in the universe will slow the expansion to the point where it would finally come to a halt and then start to retract

Explanation:

Answer:

the matter in the universe will slow the expansion to the point where it would finally come to a halt and then start to retract

Explanation:

Plato/Edmentum

Answer:

plants because of photosynthesis humans because of food and the energy causing cells in it and batteries or solar panels because of the sun.

Explanation:

Answer:

C: it ignores parts of the method within an investigation

Answer:

the scientific concept being illustrated in this model is dispersion

Explanation: A) half wave rectifier

B) Full wave rectifier :

1) central tapped

2) bridge rectifier

i hope this was helpful to you