racquetball strikes a wall with a speed of 30 m/s and rebounds with a speed of 26 m/s. the 189) collision takes 20 ms. what is the average acceleration of the ball during the collision?

1.) Two factors that may impact North Korean's shorter life expectancy are: malnutrition, lack of access to adequate healthcare  and environmental pollution. 2.) Economic development and infrastructure. 3.) Political systems, historical events, and geopolitical factors.

1.)Two factors that may impact North Korean's shorter life expectancy are:

a) Malnutrition and lack of access to adequate healthcare: North Korea has faced economic sanctions and political isolation, which has led to food shortages and limited access to basic healthcare services. This situation can lead to malnutrition and increased susceptibility to diseases, resulting in shorter life expectancy.

b) Environmental pollution: Exposure to air pollution can lead to various health problems, including respiratory diseases, which can contribute to a shorter life expectancy.

2.)The nighttime photo taken from space reveals a stark difference between North and South Korea in terms of economic development and infrastructure.

3.) The difference in economic development and infrastructure between North and South Korea can be attributed to a range of factors, including political systems, historical events, and geopolitical factors.

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To increase the efficiency of the Carnot engine by 10% of the original efficiency, the temperature of the heat source should be increased by 0.067 times its original value

The efficiency of a Carnot engine is given by:

Efficiency = 1 - (Tc/Th)

Where

In this case, the efficiency of the engine is 40%, which can be expressed as 0.4 in decimal form. Therefore:

0.4 = 1 - (Tc/Th)

Rearranging this equation, we get:

Tc/Th = 0.6

We want to increase the efficiency by 10% of the original efficiency. This means that the new efficiency will be :

0.4 + 0.1(0.4) = 0.44

We can use this new efficiency to find the new ratio of Tc/Th:

0.44 = 1 - (Tc_new/Th_new)

Tc_new/Th_new = 0.56

Now we need to find by how many degrees the temperature of the heat source should change to achieve this new ratio of temperatures. We can set up an equation using the two ratios of temperatures:

(Tc/Th) / (Tc_new/Th_new) = 0.6 / 0.56

Substituting the first ratio we found earlier and simplifying, we get:

0.6 / (Th_new/Th) = 0.6 / 0.56

Th_new/Th = 0.56/0.6

Th_new/Th = 0.933

Multiplying both sides by Th, we get:

Th_new = 0.933 Th

So the temperature of the heat source should be increased by:

ΔT = Th_new - Th = 0.933 Th - Th = 0.067 Th

Where ΔT is the change in temperature and Th is the original temperature of the heat source.

Therefore, to increase the efficiency of the Carnot engine by 10% of the original efficiency, the temperature of the heat source should be increased by 0.067 times its original value.

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Answer:

im sorry but what is the question please tell me in the comments s i can help you

Explanation:

Answer: 0.1

Explanation: The wire size is very important when making decisions on the wiring of any equipment,house and other things. It has also been found that the size of the wire determines the load that can be allowed through it.

The right wire size application chart should always be considered before selecting the wiring diagram or system for any building or equipment as it can help to determine the amount of voltage that can be effectively carried through it.

Answer:

I think it may be either A. or C.

Explanation:

A factor which has the most significant influence on a liquid's surface tension is: D. The strength of the electric forces between its molecules.

Surface tension is a property of liquid such as water, which makes its surface to resist an external force due to the cohesive nature of the liquid's molecules.

Hence, the surface tension of a liquid is highly dependent on the electric (cohesive) forces of attraction existing between its molecules.

Additionally, the surface tension of a liquid is an inward force which tends to minimize its surface area rather than maximizing its surface area.

In conclusion, the strength of the electric (cohesive) forces of attraction between a liquid's molecules has the most significant influence on a liquid's surface tension.

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There are several variables that can affect the thermal energy of an object:

Temperature: The higher the temperature of an object, the greater its thermal energy.

Mass: The greater the mass of an object, the greater its thermal energy.

Specific heat capacity: The specific heat capacity of a material determines how much energy is required to raise its temperature. Materials with a higher specific heat capacity require more energy to raise their temperature, resulting in a higher thermal energy.

Phase: The phase of an object (solid, liquid, or gas) can affect its thermal energy. For example, it takes more energy to change the phase of a substance from solid to liquid or from liquid to gas than it does to raise its temperature within a given phase.

Surface area: The greater the surface area of an object, the greater the amount of heat it can absorb or release, leading to a change in thermal energy.

Thermal conductivity: The thermal conductivity of a material determines how quickly it can transfer heat. Materials with high thermal conductivity can transfer heat quickly, resulting in a higher thermal energy.

The hanging mass moves at  6.925 meters vertically in 3.0 seconds.

Mass of hanging weight (m1) = 1.71 kg

Mass of pulley wheel (m2) = 4.83 kg

Radius of pulley wheel (r) = 0.689 m

Time (t) = 3.0 seconds

We have that d = (1/2) * a * t²

We know that a = linear acceleration and

a = (m1 * g) / (m1 + m2)

a = (1.71 kg * 9.8 m/s²) / (1.71 kg + 4.83 kg)

a = 1.534 m/s²

We then substitute the values of a and t into the equation for distance :

distance   = (1/2) * 1.534 m/s² * (3.0 s)²

distance  = 6.925 m

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Answer:

32.5

Explanation:

Choose the normal force acting between the object and the ground. Let's assume a normal force of 250 N .

Determine the friction coefficient. ...

Multiply these values by each other: (250 N) * 0.13 = 32.5 N .

You just found the force of friction!

Answer:

The value is \(\mu_ k = 0.249\)

Explanation:

From the question we are told that

   The mass of the crate is  \(m = 270 \ kg\)

   The force applied by the first worker is  \(F_1 = 430 \ N\)

   The force applied by the second worker is \(F_2 = 230 \ N\)

Generally the kinetic frictional force between the crate and the floor is equal to the force applied by both worker , this is mathematically  represented as

        \(F_f = F_1 + F_2\)

Here  \(F_f\) is the frictional force and this is mathematically represented as

      \(F_f = \mu_ k * m * g\)

So

     \(\mu_ k * m * g = F_1 + F_2\)

=>  \(\mu_ k * 270 * 9.8 = 430 + 230\)

=>  \(\mu_ k = 0.249\)

Answer:five times five is twenty five divded by 10 is 2.5 seconds of acceleration

No, the vectors u = <-1, 2> and v = <3, -17> are not perpendicular.

To determine if two vectors are perpendicular, we can calculate their dot product. If the dot product is zero, the vectors are perpendicular. If the dot product is nonzero, the vectors are not perpendicular.

The dot product of two vectors u and v is given by:

u · v = u₁ * v₁ + u₂ * v₂

where u₁ and u₂ are the components of vector u, and v₁ and v₂ are the components of vector v.

Calculating the dot product of u = <-1, 2> and v = <3, -17>, we have:

u · v = (-1 * 3) + (2 * -17) = -3 - 34 = -37

Since the dot product is -37 and not zero, we can conclude that the vectors u and v are not perpendicular.

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Answer:

A similarity is that they all pick up radio signals all the time!

Explanation:

Hope this helps!

The result of two or more vectors is the outcome.  it's the outcome of multiplying two or more vectors.  The resultant result of adding the displacement vectors A, B, and C are vector R. An appropriately drawn, scaled, vector addition diagram is often used to compute vector R, as illustrated within the diagram.

What do three resultant vectors add up to?

Afbeeldingsresultat for these vectors' offspring

The outcome of multiplying vectors A + B + C is the same as that of multiplying vectors B + A + C or even C + B + A.  The resultant result will be the same as long as all three vectors are present with the appropriate magnitude and direction. The resultant of two or more vectors is the outcome.

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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:

your answer is changing

Explanation:

you cant what done is done unless you start over. well think of a game it is its own dimension created by man for our entertainment but its not perfect there are glitches and modifications. but you are not the main character only one is and He gives us our own controler our brain. but if your athiest then ask me in the comments. i can explain both ways

Answer:

The world as we know it has three dimensions of space—length, width, and depth—and one dimension of time. But there's the mind-bending possibility that many more dimensions exist out there. According to string theory, one of the leading physics models of the last half-century, the universe operates with 10 dimensions. A dimension arises when a force is generated that allows movement into a new domain. Yes, I personally do believe in them for reasons I can't explain. Dimensional shifts were a phenomenon whereby an object or person is transported from one location to another via folded-space transport or shifted to a parallel universe on a different dimensional plane.

Explanation:

Have a great rest of your day
#TheWizzer

Answer:

geocentric

i hope this helps!!!!

Explanation:

Hey,

Following the second Newton's Law  :

✔ We apply : F = m x a ⇔ m = F/a with F in N, m in kg and a in m/s²

the object therefore has a mass of 8 kg

The mass of lead = 22,939 kg

Given

mass alcohol=1600 kg

The density of lead =11300kg\m³ and density of alcohol=790kg\m³

Required

mass of lead

Solution

\(\tt V=\dfrac{mass}{\rho}\\\\V=\dfrac{1600}{790}\\\\V=2.03~m^3\)

the volume of lead=volume of alcohol=2.03 m, so the mass of lead :

\(\tt m=\rho\times V\\\\m=11300\times 2.03\\\\m=22,939~kg\)

Let's look at relationship

\(\\ \rm\rightarrowtail T=2\pi\sqrt{\dfrac{m}{k}}\)

\(\\ \rm\rightarrowtail T\propto \sqrt{m}\)

Hence

\(\\ \rm\rightarrowtail \dfrac{T_1}{T_2}=\sqrt{\dfrac{m1}{m2}}\)

\(\\ \rm\rightarrowtail \dfrac{1.5}{2}=\sqrt{\dfrac{0.5}{m2}}\)

\(\\ \rm\rightarrowtail 0.75^2=\dfrac{0.5}{m2}\)

\(\\ \rm\rightarrowtail m_2=\dfrac{0.5}{0.75^2}\)

\(\\ \rm\rightarrowtail m_2=0.889\)

Hence

Answer

Mass needs to added =0.889-0.500=0.389kg

Explanation:

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

Answer:

\(\mathbf{\dfrac{I(5l)}{I(l) } =10^{-8}}\)

Explanation:

We are being told that the current is proportional to the tunneling coefficient\(I(l) = I_0 e^{-2kl}\) ;

where l = distance between the tip and the surface.

Let      \(I(l) = I_0 e^{-2kl}\)        ------------  equation (1)

and     \(I(5l) = I_0 e^{-2k(5l)}\)   ------------ equation (2)

Dividing equation (2) by (1); we have :

\(\dfrac{I(5l)}{I(l) } = \dfrac{I_0 e^{-2k(5l)}}{ I_0 e^{-2kl}}\)

\(\dfrac{I(5l)}{I(l) } =e^{-2k(5-1)l}\)

\(\dfrac{I(5l)}{I(l) } =(e^{-2kl})^4\)

where ;

\((e^{-2kl})\) represents the transmission coefficient T = 0.01

Thus; replacing the value for 0.01;we have;

\(\dfrac{I(5l)}{I(l) } =0.01^4\)

\(\mathbf{\dfrac{I(5l)}{I(l) } =10^{-8}}\)

To calculate the density of the metal cube, we need to use the formula:

density = mass/volume

Since the cube is a perfect cube, we can find its volume by using the formula:

volume = side^3

So, volume = 3.21 cm x 3.21 cm x 3.21 cm = 32.79 cm^3

Now, we can substitute the values in the formula:

density = 0.347 kg / 32.79 cm^3

Density = 10.57 g/cm^3

To identify the metal, we need to compare its density with the known densities of various metals. According to the periodic table, the closest density to 10.57 g/cm^3 is that of copper, which is 8.96 g/cm^3. Therefore, it is unlikely that the metal is copper. The closest density to 10.57 g/cm^3 after copper is that of tungsten, which is 19.25 g/cm^3. Therefore, the metal is more likely to be tungsten.

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Answer: ZERO

Explanation:

zero

The acceleration of a car that travels in a straight line at a constant speed of 100 km/h is zero. Average acceleration = (change in velocity)/(time it takes). Since the car's change in velocity is zero, its acceleration is zero.

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Answer:

At a convergent boundary where both plates are continental, mountain ranges grow and earthquakes are common. At a transform boundary, there is a transform fault and massive earthquakes occur but there are no volcanoes. Processes acting over long periods of time create Earth's geographic features.

Explanation:

Answer:

Yes

Explanation:

tamad ako magexplain

Answer:

Yes

Explanation:

The force exerted by a magnet is called

The push or pull of magnetism

can act at a distance, which means that the

magnet does not have to touch an object

to exert a force on it. When you close the

refrigerator, you feel the pull before the

magnet actually touches the metal frame.

There are other forces that act at a distance,

including gravity and static electricity. Later

you will read how the force of magnetism is

related to electricity. In fact, magnetism is

the result of a moving electric charge.

The required time taken to cover the given distance with specified speed is calculated to be 0.109 hr or 392.4 sec.

The distance travelled is given as 7150 km.

The speed is given as 780 km/hr.

The relationship between time, speed, and distance is known as,

Distance d = speed s/time t

d = s/t

Entering the values into the above equation, by making 't' as subject,

t = s/d = 780/7150 = 0.109 hr

Let us convert hours into seconds,

⇒ 0.109 hr = 0.109(60×60) = 392.4 sec

Thus, the time taken to cover the given distance with specified speed is calculated to be 0.109 hr or 392.4 sec.

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A.1.2°C

The First Law of Thermodynamics states that heat is a form of energy, and thermodynamic processes are therefore subject to the principle of conservation of energy.

To find internal energy, you have to add the heat added in the system and work done in the system because the work done is not lost but rather it is added in the system.

Step 1

a)let

to add the energy it must have the same measure unit, so let's convert calories into Julies

remember that

b) now, replace in the formula

now, we have the change of internal energy

Step 2

now, let's find the change in temperature

Use the calorimetry formula.

where m is the mass, Q = heat energy, c = specific heat capacity, and ∆T = change in temperature

a)

let

now,

so, the answer is

A.1.2°C