#4, I really need help ;)

The average speed of the car is 35.6m/s

The average speed is the total distance traveled by the object in a particular time interval. The average speed is a scalar quantity. It is represented by the magnitude and does not have direction. It is measured in meter per second

Therefore average speed = total distance / total time taken

The total distance here is 500+ 500= 1000km = 1×10⁶m

the time taken for the first journey = 500×1000/35= 14285.71 seconds

the time taken for traveling back = 500000/43= 11627.91 seconds

total time taken = 14285.71 + 11627.91 = 25913.62seconds

therefore average speed = 1000000/25913.62

= 35.6m/s

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option C, which states that the driving frequency is lower than the resonance frequency. In a driven RLC circuit, the voltage across each component is affected by the frequency of the driving source. At the resonance frequency, the circuit exhibits a maximum response.

In this scenario, we are given the values of Vc, Vr, and Vl, and we need to determine the driving frequency.

To solve this problem, we need to compare the values of Vc, Vr, and Vl to each other. Since Vl is greater than Vr and Vc, it indicates that the circuit is predominantly inductive. This means that the impedance of the circuit increases with frequency.

Therefore, the driving frequency must be lower than the resonance frequency to create an inductive response. So, the correct answer is option C, which states that the driving frequency is lower than the resonance frequency.

In summary, by analyzing the voltages across the components of the circuit, we can determine the type of response and the frequency of the driving source. The RLC circuit's response is dependent on the impedance of the components, which changes with frequency, and this response can be used in various applications, including filtering and tuning circuits.

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Answer:

160J OR 140J

Explanation:

Depends on teacher which formula your teacher uses.

U=Q+W OR U=Q-W

Method 1:

U=150+10J=160

U=150-10=140J

The distance above the ground the rock  should be dropped such that it hits the ground at 2t after it is released from rest is 4h.

The height of fall of the rock is calculated by applying the following kinematic equation as shown below.

h = vt + ¹/₂gt²

where;

h = 0 + ¹/₂gt²

h = ¹/₂gt²

2h = gt²

g = 2h / t²

h₁ / t₁² = h₂ / t₂²

The distance above the ground the rock  should be dropped such that it hits the ground at 2t after it is released from rest is calculated as;

h₂ = ( h₁ / t₁² )(t₂²)

h₂ = ( h/t²)(2t)²

h₂ = ( h/t²)(4t²)

h₂ = 4h

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Answer: Substance 3 is liquid at room temperature

Explanation: The common room temperature is assumed to be 20-22°C, we need to find the substance that will be in liquid state in that temperature.

For Substance 1, the boiling point is -195.975°C, and hence at room temperature, it would be in vapor phase and all liquid would have turned to gas.

For Substance 2, the boiling point is 3.85°C, and hence at room temperature, it would be in vapor phase and all liquid would have turned to gas in this case too.

For Substance 3, the boiling point is 77.85°C, and melting point is -108.15°C, hence at room temperature, it would be in liquid state.

For Substance 4, the melting point itself is 1800°C, due to which at room temperature it would be in solid state.

Answer:

b

Explanation:

Answer:

b

Explanation:

trust

This is an exercise in Rectilinear Uniformly Varied Motion (MRUV) is a type of motion in which an object moves in a straight line and experiences changes in its velocity at a constant rate. In this type of motion, the acceleration of the object remains constant over time.

The distinctive feature of the MRUV is that the velocity of the object changes uniformly, that is, its velocity increases or decreases by a constant amount in each unit of time. If the object experiences a positive acceleration, its velocity increases with time. On the other hand, if the object experiences a negative acceleration, its speed decreases.

In an MRUV, constant acceleration has a direct impact on displacement and the time it takes for the object to reach a certain speed. Also, the direction of the acceleration determines whether the object is accelerating or decelerating relative to its initial motion.

This type of movement is found in various situations of daily life, such as the launch of an object upwards and its subsequent fall, the movement of cars on a road with acceleration or braking, or even the study of bodies in free fall.

Vf = V₀ + a × t

Where:

In this case, the initial velocity (vi) is 1 m/s, the acceleration (a) is -1 m/s^2 (negative because it indicates deceleration), and the time (t) is 4 seconds.

Substituting these values into the formula, we get:

Vf = V₀ + a × t

Vf = 1 m/s + (-1 m/s²) × 4 s

Vf = 1 m/s - 4 m/s

Vf = -3 m/s

Answer:

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

\(a = \frac{f}{m} \\ \)

f is the force

m is the mass

From the question we have

\(a = \frac{580}{50} = 11.6 \\ \)

We have the final answer as

Hope this helps you

Answer: They are inversely proportional

Explanation:

wiens displacement law assets that for the black body radiation the curve for distinct temperature will peak at distinct wavelength are varying inversely proportional to the temperature

The relationship between temperature and peak wavelength they are inversely proportional.

Wien's displacement law asserts that for the black-body radiation the curve for distinct temperatures will peak at distinct wavelengths are varying inversely proportional to the temperatures.

Wien's Law given as

\(\lambda_{\max }=\frac{0.29}{T}\)

Where

T=Temperature (In Kelvin unit)

λ(max)= Peak wavelength (In cm unit)

Therefore we can say that wavelength and temperature are inversely proportional.

This formula reads: (max) = peak wavelength (cm) Temperature is T. (K) What is the link between temperature and peak wavelength? Please explain using the simulation results and the proportionality relationships you have learnt about this month. They are proportionate in a direct way.

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Answer:

suppose frequency of sound = 100Hz

then wavelength = speed/ frequency

= 340/100= 3.4 m

Answer:

a) Time taken for the spaceship to reach Sirius, t' = 8.86 years = 9 years(approx)

b) The mass of the interstellar gas that collides with the spaceship, m' = 1.195 * 10^(-27) kg

Explanations:

The calculations are handwritten and attached as files below. However, the following steps were taken to arrive at the solutions

a) to calculate the time taken for the spaceship to reach Sirius

Step 1: calculate the time taken to reach Sirius from the perspective of the earth using time = distance/speed

Step 2: Use lorentz time dilation formula to calculate the equivalent time to reach Sirius from the perspective of the person in the spaceship

b) to calculate the mass of the interstellar gas

Step1: Calculate the new length of the spaceship using special relativity

Step 2 Get the new volume also by using the new length gotten

Step2: Get two equations for the original mass and the new mass using mass = density * volume

Step 3: Write the original mass in terms of the new mass and make necessary substitution.

Note: Check complete solution in the file attached.

The reference equality is tested using the == operator. True. If obj1 and obj2 refer to same object, then obj1 == obj2 is true. True. A String object cannot be changed.

In programming, a string is a form of data that is used to data type rather than integers. Letters, numbers, symbols, and even spaces can all be found in a string, which is a collection of characters. In order for it to recognized as a string, it needs to be encapsulated in quotation marks.

A string is frequently implemented as just an array data structure of bits (or words) that records a sequence of elements, usually characters, using some text encoding. Typically, a string is considered to be a data type.

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Answer:

Mass and volume.

Explanation:

The equation for density is always mass divided by volume. To determine the density of a fluid, you would need to find its volume and its mass.

Answer:

index fossil, any animal or plant preserved in the rock record of the Earth that is characteristic of a particular span of geologic time or environment. A useful index fossil must be distinctive or easily recognizable, abundant, and have a wide geographic distribution and a short range through time. Index fossils are the basis for defining boundaries in the geologic time scale and for the correlation of strata. In marine strata, index fossils that are commonly used include the single-celled Protista with hard body parts and larger forms such as ammonoids. In terrestrial sediments of the Cenozoic Era, which began about 65.5 million years ago, mammals are widely used to date deposits. All of these animal forms have hard body parts, such as shells, bones, and teeth, and evolved rapidly.

Explanation:

Among the given options, cultural differences are most likely to be the centrifugal force within the EU in the future. The EU is a political and economic union of 27 member states, and cultural differences among its member states have always been present.

With the increasing number of immigrants from different parts of the world, the cultural differences among EU member states are becoming more prominent. Each member state has its unique language, history, customs, and traditions, which can create misunderstandings and conflicts among the member states.
The EU aims to promote unity and solidarity among its member states, but cultural differences can lead to a lack of understanding and trust between them. The EU's diverse cultural heritage is both a strength and a challenge for the union. The EU needs to find a way to respect the cultural diversity of its member states while maintaining its unity.
However, the cultural differences among the member states can still cause tensions and conflicts in the future. Therefore, it is crucial for the EU to continue to foster cultural awareness and understanding among its member states to maintain the union's cohesion and stability.

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complete question:

Which of these is most likely to be a centrifugal force within the EU in the future?

a. trade barriers

b. closed borders

c. pollution problems

d. cultural differences

Answer:

5 Hz

Explanation:

Given:

Wave velocity ( v ) = 10 m / sec

wavelength ( λ ) = 2 m

We have to calculate Frequency ( f ) :

We know:

v = λ / t [ f = 1 / t ]

v = λ f

= > f = v / λ

Putting values here we get:

= > f = 10 / 2 Hz

= > f = 5 Hz

Hence, frequency of sound is 5 Hz.

Answer: Pitch of the sound depends on the frequency of the sound wave. The pitch is affected by the source of production of sound wave. It also depends on the shape of the medium in which it travels.

Explanation:

The magnitude and direction of the force P are 5 N and 24° respectively.\( \begin{matrix} \ \\ \end{matrix}\)The direction of the force P is equal to 180 - 24 = 156°.

Using the method of resolving forces, the following steps should be taken:First, draw the diagram below, labeling the angles appropriately: \( \begin{matrix} \ \\ \end{matrix}\)Resolve the force 20 N into components, one along the 15 N force and the other perpendicular to it. \( \begin{matrix} \ \\ \end{matrix}\)This results in the following triangle:

\( \begin{matrix} \ \\ \end{matrix}\)The direction of the force P is equal to 180 - 24 = 156°.

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Explanation:

Power is change in energy over time.

P = (50 J) / (5 s)

P = 10 W

Answer: C

Explanation:

For this problem, we must divide.

50 ÷ 5 = 10

The answer to the question is 10

The way Rannan made an error in his scientific process is he should not use his opinions as evidence.

A scientific experiment requires some systematic process that involves making observations and then forming his opinion about those observations.

A scientific experiment  should be guided by a known model and based on individual opinions.

Thus, the way Rannan made an error in his scientific process is he should not use his opinions as evidence.

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Answer:

Answer is B. He should not use his opinions as evidence.

Explanation:

His opinion may not be right

Newton's Second Law of Motion states "The rate of change of momentum of a body is directly proportional to the applied unbalanced force in the direction of force".

Answer:

answer is metals

Answer:

below

Explanation: When a liquid changes into a gas vaporization has occurred. The process can either occur due to boiling or evaporation. Boiling occurs when the vapor pressure of the liquid is raised (by heating) to the point where it is equal to the atmospheric pressure.

You can use thermal energy to change a liquid into a gas.

By virtue of its temperature, a system in a condition of thermodynamic equilibrium has thermal energy, or internal energy. Unlike the energy of systems that are not in a state of thermodynamic equilibrium, thermal energy cannot be transformed into meaningful work as quickly.

For instance, the same fluid or solid in a thermodynamic equilibrium state with the same energy (as thermal energy) cannot do work unless it is combined with another substance at a different temperature, as in a heat engine. However, the same fluid or solid in a moving state with the same energy (as mechanical energy) can be converted to work in some mechanical device, such as a windmill or a waterwheel.

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To find the average velocity of the ball, we can use the equation: average velocity = (initial velocity + final velocity) / 2. Since the initial velocity is 0 m/s (as the ball is dropped):

average velocity = (0 + 19.82) / 2 ≈ 9.91 m/s

(a) To find the time of flight, we can use the formula:

h = 1/2 * g * t^2

Where h is the height of the building (20m), g is the acceleration due to gravity (9.8 m/s^2), and t is the time of flight. Rearranging this formula to solve for t, we get:

t = sqrt(2h/g)

Plugging in the values, we get:

t = sqrt(2*20/9.8) = 2.02 seconds

So it takes the ball 2.02 seconds to hit the ground.

(b) To find the final velocity of the ball, we can use the formula:

v^2 = u^2 + 2gh

Where v is the final velocity, u is the initial velocity (which is zero since the ball is dropped from rest), g is the acceleration due to gravity (9.8 m/s^2), and h is the height of the building (20m). Rearranging this formula to solve for v, we get:

v = sqrt(2gh)

Plugging in the values, we get:

v = sqrt(2*9.8*20) = 19.8 m/s

So the final velocity of the ball is 19.8 m/s.

(c) To find the average velocity of the ball, we can use the formula:

average velocity = (final velocity + initial velocity) / 2

Since the initial velocity is zero, we just need to divide the final velocity by 2:

average velocity = 19.8 / 2 = 9.9 m/s

The average velocity of the ball is 9.9 m/s.

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When you push a pencil off your desk, the energy transformation that takes place is that potential energy transforms into kinetic energy.

The correct answer to the given question is option C.

Potential energy is the energy stored within an object because of its position or configuration.

In this scenario, the pencil has potential energy because of its elevated position on the desk. When the pencil is pushed off the desk, it begins to move, which means that it has kinetic energy. Kinetic energy is the energy of motion.

As the pencil falls off the desk, its potential energy is transformed into kinetic energy, which is the energy that results from its motion. The faster the pencil falls, the greater its kinetic energy will be because kinetic energy is directly proportional to the square of an object's velocity.

Therefore, when you push a pencil off your desk, the potential energy that it has because of its elevated position is transformed into kinetic energy as it falls towards the ground.

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Answer:

Double-replacement

Explanation:

2Li + CaCl2 → 2LiCl + Ca O

D. Double-replacement

a) The efficiency of this carnot engine = 0.672 = 67.2%

Carnot heat engine converts 67.2% of the heat it receives to work.

b) The amount of heat rejected to the sink per cycle = 164 kJ

\(Q_{H}\) = 500 kJ

Efficiency of this carnot engine =?

Amount of heat rejected to the sink per cycle =?

a) Carnot heat engine is a reversible heat engine; its efficiency can be calculated from:

\(n_{th,rev} = 1 - \frac{T_{L} }{T_{H} }\)

\(n_{th,rev} = 1 - \frac{(30+273)K}{(652+273)K}\)

= 0.672

The efficiency of this carnot engine = 0.672 = 67.2%

b) The amount of heat rejected \(Q_{L}\) by heat reversible engine can be calculated from:

​\((\frac{Q_{H} }{Q_{L} } )_{rev} = \frac{T_{H} }{T_{L} }\)

\(Q_{L,rev} = \frac{T_{L} }{T_{H} } Q_{H,rev}\)

= \(\frac{(30+273)K}{(652+273)K} (500KJ)\)

= 164KJ

Carnot heat engine converts 67.2% of the heat it receives to work.

The amount of heat rejected to the sink per cycle = 164 kJ

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Answer:C The final velocity is half of trained car B's initial velocity.

Explanation:

Answer: C i just got it right on e d g e n u i t y :)

Explanation: