ANSWER QUICKK (this is science)
In 1968, the Deep Sea Drilling Project began extracting sediment cores from the ocean floor. Analysis of these cores has since shown that the ocean basins are very young compared to the accepted age of the Earth. No rocks older than 180 million years have been found. The cores further indicate that ocean sediments are absent at the mid-ocean ridge and get thicker moving
away from the ridge.
This evidence helped to confirm what aspect of the plate tectonic theory?
A sea-floor spreading
B paleomagnetic reversals
C existence of land bridges
D location of the lithosphere

Answer:

gravitational force .. .. .

Explanation:

Question :-

Answer :-

\( \rule {180pt}{2pt} \)

Given :-

To Find :-

Solution :-

As per the provided information in the given question, we have been given that the Resistance of the Device is 20 Ohm's. It's Current is given as 15 Ampere . And, we have been asked to calculate the Voltage .

For calculating the Voltage , we will use the Formula :-

\( \bigstar \: \: \: \boxed {\sf { \: Voltage \: = \: Current \: \times \: Resistance \: }} \)

Therefore , by Substituting the given values in the above Formula :-

\( \Longrightarrow \: \: \: \sf { Voltage \: = \: Current \: \times \: Resistance } \)

\( \Longrightarrow \: \: \: \sf { Voltage \: = \: 15 \: \times \: 20 } \)

\( \Longrightarrow \: \: \: \bf { Voltage \: = \: 300 } \)

Hence :-

\( \underline {\rule {180pt}{4pt}} \)

Additional Information :-

\( \Longrightarrow \: \: \: \sf {Voltage \: = \: Current \: \times \: Resistance} \)

\( \Longrightarrow \: \: \: \sf {Current \: = \: \dfrac {Voltage}{Resistance}} \)

\( \Longrightarrow \: \: \: \sf {Resistance \: = \: \dfrac {Voltage}{Current} } \)

Answer:

300 volts

Explanation:

now in this question we have been given our resistance which is 20 ohms and our current which is 15A

using ohm's law

V=IR

where v is voltage, I is current and r is resistance

now substitute,

V=15 x 20

V=300

I hope I helped

The volume of the balloon is increased to 2.9 L.

Initial volume of the balloon, V₁ = 0.5 L

Initial temperature of the balloon, T₁ = 20°C = 293 K

Final temperature, T₂ = 150°C = 423 K

According to Charle's law,

V₁/T₁ = V₂/T₂

The final volume,

V₂ = (V₁/T₁)T₂

V₂ = 0.5 x 423/293

V₂ = 2.9 L

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Your question was incomplete, but most probably your question will be:

A balloon has a volume of 0.5 L at 20°C. If the balloon is heated to 150°C, assuming the atmospheric pressure to be constant at 101,325 pa, by what amount does the volume of the balloon change?

An aluminium wire's cross-sectional area is\(A = 3.1 * 10^{-5} m^{2}\), and its length is L = 0.17 m.

The resistance of an aluminum wire is given by the formula:

\(R = \frac{\rho L}{A}\)

Where R = resistance, ρ = resistivity of aluminum, L = length of wire, and A = cross-sectional area of wire.

So that we can solve for A, we can rearrange the equations as follows

\(A =\frac{ \rho L}{R}\)

Plugging in the given values, we have:

\(A =\frac{ (1.7 * 10^{-8} Ohm*m)(L)}{(0.1 Ohm)}\)

Solving for L,

\(L = \frac{(0.1 Ohm)(A)}{(1.7 * 10^{-8} Ohm*m)}\)

We also know that the mass of the aluminum wire is 54 g. The following formula determines a wire's mass:

\(m = \rho AL\)

In order to find A, we can rearrange the equation as follows:

\(A = \frac{m}{(\rho L)}\)

Plugging in the given values, we have:

\(A =\frac{ (54 g)}{((1.7 *10^{-8} Ohm*m)(L))}\\A = 3.1 * 10^{-5} m^{2}\)

Combining the two equations, we obtain:

\(L =\frac{ (54g)(0.1 Ohm)}{((1.7 * 10^{-8} Ohm*m)(A))}\)

L = 0.17 m

Therefore, the cross-sectional area  is \(A = 3.1 * 10^{-5} m^{2}\) and L = 0.17 m is the length of an aluminium wire.

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The two complementary forces that keep the sun from blowing itself up are gravity and nuclear fusion.

Gravity is the force that exists between any two masses, any two bodies, any two particles. It is the force that attracts a body towards the center of the Earth, or towards any other physical body with mass.

Nuclear fusion is the process by which two atomic nuclei join together to form a heavier nucleus. This process releases energy, as per the famous equation,

E = mc²,

where E is the energy released, m is the mass that gets converted to energy, and c is the speed of light. The sun and other stars release energy through nuclear fusion.

Gravity is the force that attracts all the particles of matter together in the sun's core. It keeps the nuclear fuel together and squeezes the matter so tightly that the temperature and pressure in the core are sufficient to make nuclear fusion reactions occur.

The energy released during nuclear fusion reactions in the sun's core is what keeps the sun shining and stable. The outward pressure from the energy released in nuclear fusion is balanced by the inward force of gravity. The sun stays in a stable equilibrium state where these two forces are balanced, preventing it from blowing itself apart.

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The model house on remote renewable energy will generate (20mmm + 30sss) kilowatt-hours of energy in 10 years.

Given:

Remote Renewable House= 2 windmills + 3 turbines

1 windmill generate mmm kilowatts-hours in a year

Therefore,

2 windmills will generate,

2×mmm=2mmm kwh in a year

In 10 years, 2 windmills will generate

10×2mmm=20mmm

1 solar panel generate sss kilowatt-hour each in 1 year

3 solar panels will generate yearly

3×sss=3sss

In 10 years, 3 solar panels will generate

10×3sss=30sss

Therefore, the total energy generated in the renewable model house is in 10 years

(20mmm+30sss)  kwhr

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The wind speed would be 255km/hr if the hurricane is moving east due east at a speed of 40 km/hr and the average wind speed of hurricane was 215 km/hr.

We must determine the localized wind speed at Point A because it is the end of the storm and has the highest velocity.

Speed at point A equals the combined speeds of the hurricane and the forward motion since point A is situated in the same rotational direction as the cyclone.

speed at point A = speed of hurricane + speed of forward

                            = 215 + 40 = 255km/hr

What does a hurricane mean in simple terms?

A hurricane is defined as a tropical storm with sustained winds of 74 mph or more. A storm's eye typically measures 20 to 30 miles in width and can reach distances of 400 miles. Storms may be dangerous because of their heavy downpours, strong gusts, and storm surges.

Where do storms usually begin?

Near the tropics, in the Caribbean, or in the waters around the Cape Verdean islands of West Africa, hurricanes start to form. Surface water that is relatively warm quickly evaporates before condensing to create clouds in the sky. When moist air rises to the point of saturation, a tropical depression—a kind of meteorological system—is created.

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Answer:

the 70kg man

Explanation:

because he has more weight and is moving faster

The average acceleration of a car which goes from 0 to 60 mph in first second would be 30 and over 2 seconds is 22.

Since the Average acceleration from \(t + h\) is given

\(A_{vg} =\frac{v(t+h)-v(t)}{h}\)    ; \(h\) ≠ \(0\)

The average acceleration for the first second would be

\(a_{avg} = \frac{v(0+1)-v(0)}{1} \\= {v(1)-v(0)\\\\\)

=30-0

=30

The average acceleration over \(2\) seconds is:

\(a_{avg} =\frac{v(1+1)-v(1)}{1} \\=v(2)-v(1)\\\)

= 52-30

=22

Acceleration is defined as the change in object velocity over time. Acceleration is a vector term and requires both magnitude and direction to define it. Units of acceleration are m/sec², miles/sec², etc.

In a velocity versus time graph, acceleration is the slope of the curve.

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After performing the calculations, the radius of the proton's circular path is approximately 0.18 cm when rounded to two significant figures.

The radius of the circular path followed by a proton moving perpendicular to a magnetic field can be determined using the formula:

r = (m*v) / (q*B)

where r represents the radius, m is the mass of the proton, v is its velocity, q is the charge of the proton, and B is the magnetic field strength.

Given:

Kinetic energy of the proton = 4.9×10^(-16) J

Magnetic field strength = 0.37 T (Tesla)

To find the velocity of the proton, we can use the formula for kinetic energy:

K.E. = (1/2) * m * v^2

Rearranging the equation to solve for v:

v = √((2 * K.E.) / m)

The mass of a proton (m) is approximately 1.67 × 10^(-27) kg, and the charge (q) of a proton is 1.6 × 10^(-19) C.

Now, substituting the given values into the equation for the radius:

r = ((1.67 × 10^(-27) kg) * √((2 * 4.9×10^(-16) J) / (1.6 × 10^(-19) C))) / (0.37 T)

Evaluating this expression gives us the radius of the proton's circular path.

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The age of the rock is 3.512 billion years.

What are 3 types of rocks?

1. Igneous rocks

2. Sedimentary rocks

3. Metamorphic rocks

For the first rock, the number of potassium-40 atoms is equal to the number of argon-40 atoms. That can only happen when when one half life cycle has elapsed. Therefore the age of this rock is indeed 1.25×109 years. Now let us calculate the age of the second rock sample. Let us say that the number of potassium-40 at the beginning was N​​​​​​0 and the number of potassium-40 after a particular time t us N. There after 1.25 billion years, N= N​​​​​​0 /2.  Now we know the decay constant. This means that every second,5.54×10-10 atoms of potassium-40 decay into argon-40. We can use this decay constant to calculate the time required for the number of argon-40 to be 7 times as much as potassium-40. We want the time required to get the condition N​​​​​ = N​​​​​​0/7. So the correct answer is 3.512 billion years.

Therefore,  the age of the rock is 3.512 billion years.

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The age of the rock is approximately 42 million years, calculated using the equation (7/8) = (1 - \(e^{-kt}\) ) with k = ln(2)/1.25 billion years and solving for t.

What is the dating of rock?

The dating of rocks refers to the process of determining the age of rocks or geological events using various techniques, such as radiometric dating, relative dating, and stratigraphy. Radiometric dating involves measuring the ratio of parent and daughter isotopes in a rock, while relative dating involves determining the order of events in geological history. Stratigraphy involves analyzing the layers of sedimentary rocks to determine the relative age of the rocks and the events they represent. These techniques are used by geologists to study the history of the Earth and the processes that have shaped it over time.

The ratio of argon-40 to potassium-40 in a rock can be used to determine the age of the rock based on the half-life of potassium-40. The equation for the decay of potassium-40 to argon-40 is:

K-40 --> Ar-40 + e-

where e- represents an electron and a neutrino.

The half-life of potassium-40 is 1.25 billion years, which means that half of the original amount of potassium-40 will decay to argon-40 in 1.25 billion years. After another 1.25 billion years, half of the remaining potassium-40 will decay, and so on.

If a rock contains seven times as much argon-40 as potassium-40, that means the ratio of argon-40 to potassium-40 is 7:1. We can set up the following equation to solve for the age of the rock:

(7/8) = (1 - \(e^{-kt}\))

where k is the decay constant for potassium-40, t is the age of the rock, and e is the mathematical constant approximately equal to 2.71828.

The decay constant for potassium-40 can be calculated using the following formula:

k = ln(2)/t1/2

where ln represents the natural logarithm and t1/2 is the half-life of potassium-40.

Plugging in the values, we get:

k = ln(2)/1.25 billion years = 0.00055 \(years^{-1}\)

Substituting k into the first equation and solving for t, we get:

t = -ln(7/8)/0.00055 \(years^{-1}\) = 42 million years

Therefore, the age of the rock is approximately 42 million years.

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Answer:

5238747643782 mph

Explanation:

i assure u it is

Julia walks from the park, which is six blocks east of her house, to the store, which is three blocks east of her house. Julia walks for 5 minutes. This walk's average speed will be 1.2 blocks per minute. Option B is correct.

Displacement is defined as the shortest distance between the two points. Distance is the horizontal length covered by the body. While displacement is the shortest distance between the two points.

Displacement is a vector quantity .its unit is m.

The average velocity on this walk will be;

\(\rm v_{avg}= \frac{d}{t} \\\\ \rm v_{avg}= \frac{6 \ block+ 3 \ block }{5 \ minute } \\\\ v_{avg}=1.4 \ block /min\)

Hence option B is correct.

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The magnitude of the average force is 101.33N.

Here we have to find the magnitude of the average force.

The given data:

Initial velocity(u) = 1.6m/s

Mass of the child and sled = 38 kg

Time taken = 0.60s

Formula to find the impulse:

Impulse = change in momentum

We have final velocity (v) = 0

Ft = m(v - u)

F = m(v-u)/t

F = -38 × 1.6/ 0.6

  = -101.33N

Therefore we get an average force is 101.33N.

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Answer:

Explanation:

What is the value of a in the function's equation?

A. -2

B. -3

C. 3

D. 2

ANSWER: c.

Answer:

21: Mass

22: Unbalanced Force

23: Friction

24: Balanced

Explanation:

The discrepancy between the brightness method and the orbital method in measuring the mass of the Triangulum galaxy arises due to the presence of dark matter.

The brightness method calculates a galaxy's mass based on the observed luminosity, assuming that the mass is proportional to the amount of visible light emitted. On the other hand, the orbital method calculates mass by observing the motion of stars and other objects within the galaxy, relying on the gravitational forces acting upon them.

The reason for the discrepancy between the two methods is the presence of dark matter, an invisible substance that does not emit, absorb, or reflect light, but exerts gravitational influence. Since the brightness method only accounts for visible matter, it tends to underestimate the galaxy's mass compared to the orbital method, which considers both visible and dark matter in its calculation.

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ANSWER

4 m

EXPLANATION

The circumference formula is,

Where r is the radius of the circle.

Solving for r,

The circumference of the swimming pool is 25.12m. If we use 3.14 for π,

The radius of the swimming pool is 4 m.

Answer:

Approximately \(2.69\; {\rm A}\).

Explanation:

Ensure that all values are measured in standard units. Charge should be measured in coulombs, while time should be measured in seconds:

\(\begin{aligned}t &= 3.0\; {\rm hr} \times \frac{3600\; {\rm s}}{1\; {\rm hr}} = 10800\; {\rm s}\end{aligned}\).

Electric current \(I\) is the rate of flow of electric charge.

In order to find the electric current, divide electric charge \(q\) by the time \(t\) required to transfer these charge. If charge \(q\!\) is measured in coulombs and time \(t\!\) is measured in seconds, the unit of current \(I\)would be amperes:

\(\begin{aligned}I & = \frac{q}{t} \\ &= \frac{29000\; {\rm C}}{10800\; {\rm s}} \approx 2.69\; {\rm A}\end{aligned}\).

Answer:

A. an apple falling from a tree

Explanation:

When a shaft of light approaches a smooth polished face and the light shaft bounces back, it's called the reflection of light. The incident light shaft which lands upon the face is said to be reflected off the face. The shaft that bounces back is called the reflected shaft.

When light is reflected on a aeroplane face the angle of reflection is equal to the angle of prevalence i.e. θr = θi.

Angle of prevalence is the angle between the incident shaft and the reflecting face.

Angle of reflection

This is the angle between the reflected shaft and the normal shaft on a reflecting face.

Angle of reflection is analogous to angle of prevalence.

Thus, the reflection of light is the shaft that hits the face and reflects back to the atmosphere.

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The wavelength of peak thermal emission from a sunspot can be calculated using Wien's law and a sunspot temperature of 3800 K.

Wien's Law states that the wavelength of peak thermal emission is inversely proportional to the temperature of the body emitting radiation. It is given by:

λ_max = b/T

where b is the Wien constant, 2.898 x 10^-3 m K, and T is the temperature of the emitting body. Substituting the given values into the equation,λ_max = b/Tλ_max = (2.898 x 10^-3 m K)/(3800 K)λ_max = 7.63 x 10^-7 m

The answer is expressed to three significant figures as 7.63 x 10^-7 m, with units of meters. Therefore, the wavelength of peak thermal emission from a sunspot is 7.63 x 10^-7 m.

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Respective sections (A-E) in an energy curve worksheet for the given terms:  1)  A (solid),  2 )B (solid to liquid), 3) E (gas),  4) B (solid to liquid),  5) B (solid to liquid),  6) C (liquid), 7) D (liquid to gas),  8) E (gas), 9)  E (gas),  10) A (solid),  11) A (solid)

The following are the respective sections (A-E) in an energy curve worksheet for the given terms:

1. Solid getting warmer: A (solid).

2. Liquid getting warmer: B (solid to liquid).

3. Gas getting warmer: E (gas).

4. Freezing/ Solidifying: B (solid to liquid).

5. Melting/ Liquefying: B (solid to liquid).

6. Boiling point: C (liquid).

7. Boiling (Vaporization): D (liquid to gas).

8. Particles farthest apart: E (gas).

9. Weakest IMF (intramolecular force): E (gas).

10. Particles are rigid & compressed: A (solid).

11. Particles closest together: A (solid).

All particles able to move past each other in fluid motion: C (liquid).Condensation occurs: D (liquid to gas).Strongest IMF: A (solid).Particle motion is stationary: A (solid).Particles are most chaotic and disordered. Have the most entropy: E (gas).

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The multiplier and the liquidity trap are concepts in economics that relate to the relationship between changes in aggregate demand and the overall level of economic activity.

The multiplier refers to the idea that an initial change in spending, investment, or government expenditure can have a magnified effect on the economy's output.

When there is an increase in spending, for example, households or businesses that receive the additional income will in turn spend some of it, creating a ripple effect of increased demand.

This increase in demand leads to increased production and employment, resulting in further income and spending. The multiplier effect stems from the fact that each round of spending generates additional rounds of spending, amplifying the initial impact on the economy.

On the other hand, the liquidity trap refers to a situation in which monetary policy becomes ineffective in stimulating the economy. It occurs when interest rates are extremely low, close to zero, and individuals and businesses prefer to hold on to cash rather than invest or spend.

In a liquidity trap, people are unwilling to borrow or invest because they expect further deflation or economic instability. Consequently, the central bank's attempts to stimulate the economy through lowering interest rates or increasing the money supply have limited impact since they cannot further incentivize borrowing and spending.

The liquidity trap can be problematic because it hinders the effectiveness of conventional monetary policy tools and limits the ability of the central bank to stimulate economic activity. In such situations, unconventional policies like quantitative easing or fiscal stimulus may be necessary to boost aggregate demand and overcome the liquidity trap.

Overall, the multiplier highlights the potential for a positive feedback loop in the economy, while the liquidity trap demonstrates the challenges faced when monetary policy loses its effectiveness.

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0.8521 × 10⁻²³ cm³ is the volume occupied by particles in unit cell. A unit cell refers to the smallest repeating unit in a crystal lattice that can be used to build up the entire crystal structure.

In a simple cubic unit cell, particles occupy only the corners of the cube, and each corner is shared by 8 unit cells. Therefore, the volume occupied by each particle in the unit cell is given by:

Volume of each particle = 1/8 * Volume of the unit cell

Substituting the given value of the volume of the unit cell:

Volume of each particle = 1/8 * 6.817 × 10⁻²³ cm³

Volume of each particle = 0.8521 × 10⁻²³ cm³

Therefore, the volume occupied by each particle in the unit cell is 0.8521 × 10^-23 cm³.

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The resultant of the three forces that must be carried by the gusset plate is 22.14k

The resultant itself means total or amount. So, it can be said that the resultant force is the total or overall force acting on a system. The resultant force is a vector quantity.

F₁

sin 30° = x₁/10k

x₁ = 10 × sin 30° × k

x₁ = 5k

Similarly:

y₁ = 10k × cos30°

y₁ = 10k × 0.866

y₁ = 8.66k

F₂

The angle at F₂ is 0 degrees θ = 0°

So:

x₂ = -12k

y₂ = 0

F₃

cos 45° = x₃/18k

x₃ = 18 × cos 45° × k

x₃ = 12.728 k

Similarly:

y₃ = 18k × sin 45°

y₃ = 18k × 0.707

y₃ = 12.728 k

Resultant of x:

x = x₁ - x₂ + x₃

x = 5k -12 k + 12.728 k

x = 5.726 k

Resultant of y:

y = y₁ - y₂ + y₃

y = 8.66k - 0k + 12.728 k

y = 21.388k

Resultant F:

F = \(\sqrt{x^2 + y^2}\)

F = \(\sqrt{ 5.726^2 + 21.388^2 }\)

F = \(\sqrt{ 32.787+ 457.446 }\)

F = \(\sqrt{ 490.233 }\)

F = 22.14k

So, the resultant of the three forces is 22.14k

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Answer:

gravity

Explanation:

The time it takes for light to travel across the Milky Way galaxy is approximately 102,000 years (to the nearest thousand)

The speed of light is 186,000 miles per second. The Milky Way galaxy has an approximate diameter of 6 × 10¹⁷ miles. Therefore, we can estimate the time it takes for light to travel across the Milky Way by dividing the distance by the speed of light. Using this formula, we can say that:

Time taken for light to travel across the Milky Way galaxy= 6 × 10¹⁷ miles/186,000 miles per second= 3.23 × 10¹² seconds.1 year has 365.25 days, and each day has 24 hours, each hour has 60 minutes and each minute has 60 seconds.

So the number of seconds in one year = 365.25 days × 24 hours × 60 minutes × 60 seconds= 31,536,000 seconds.

Therefore, we can determine the time it takes for light to travel across the Milky Way in years by dividing the time taken by the number of seconds in a year, as follows:

3.23 × 10¹² seconds/31,536,000 seconds per year= 1.02 × 10⁵ years.

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Minimum angle: θ ≈ 23.2 degrees | Rock's speed: v ≈ 2.65 m/s

To determine the minimum angle the string can make with the horizontal, we can analyze the forces acting on the rock when it is whirled in a horizontal circle.

Minimum angle:

The tension in the string provides the centripetal force required to keep the rock moving in a circle. The maximum tension the string can withstand before breaking is given as 150 N. At the minimum angle, the tension in the string will be equal to the breaking strength.

The centripetal force is given by the equation: \(F = m * (v^2 / r),\)where F is the force, m is the mass, v is the velocity, and r is the radius of the circle.

At the minimum angle, the tension (F) in the string is equal to the breaking strength, which is 150 N. The mass (m) of the rock is given as 970 g (0.97 kg), and the radius (r) is 1.8 in (0.04572 m). We can solve for the velocity (v).

\(150 N = 0.97 kg * (v^2 / 0.04572 m)v^2 = (150 N * 0.04572 m) / 0.97 kgv^2 = 7.0456 m^2/s^2v = √(7.0456) m/sv ≈ 2.65 m/s\)

Now, we can use trigonometry to find the minimum angle. The tension (150 N) is the vertical component of the tension force, and the horizontal component can be calculated using the angle θ:

Tension (horizontal component) = Tension (vertical component) / tan(θ)

Tension (horizontal component) = 150 N / tan(θ)

Since the tension in the horizontal direction is equal to the centripetal force, we can substitute the centripetal force equation:

\(m * (v^2 / r) = 150 N / tan(θ)\)

Now we can solve for the minimum angle (θ):

\(tan(θ) = (m * v^2) / (r * 150 N)θ = arctan((m * v^2) / (r * 150 N))\)

Substituting the given values, we can calculate the minimum angle.

Rock's speed at the minimum angle:

At the minimum angle, the rock's speed can be calculated using the previously derived velocity value (v).

The rock's speed at the minimum angle is approximately 2.65 m/s.

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