A 2 kg bar is rotating downward at 2 rad/s. The spring has an un-stretched length of Im and aspring constant of 10 N/m. Determine the angle (measured down from thehorizontal) to which the bar rotates before it stopsits initial downward movement. ( g = 10 m/s?)A. 0 = 25.4°B. 0=31.1°C. 0 = 35.2°D. 0 = 37.9°

Answer:

The kinetic energy before the collision was 8 J

Explanation:

The given parameters are;

The mass of the metal ball at rest, m₁ = 3.0 kg

The velocity of the ball at rest = 0 m/s

The mass of the metal ball that hits the one at rest, m₂ = 1.0 kg

The velocity of the metal ball that hits the one at rest, v₂ = 4.0 m/s

The velocity with which the 3.0 kg ball moves forward = 2.0 m/s

The velocity with which the 1.0 kg ball bounces back = 2.0 m/s

a) Kinetic energy, K.E. = 1/2 × m × v²

Where;

m = The mass of the of the object in motion

v = The velocity of the object

Before the collision, we have;

Initial K.E. = 1/2 × m₁ × v₁² + 1/2 × m₂ × v₂²

∴ Initial K.E. = 1/2 × 3.0 kg × (0 m/s)² + 1/2 × 1.0 kg × (4.0 m/s) ² = 8 J

The kinetic energy before the collision = The initial K.E. = 8 J.

The average density of the balloon having a volume of 5.0 m³ is 0.4 kg/m³

The mass of the balloon with the enclosed gas = 2.0 kg

The volume of the balloon = 5 m³

The density of the air = 1.3 kg/m³

The density of the balloon can be found using the formula

               ρ = m/v

where ρ is the density of the balloon

          m is the mass of the balloon

          v is the volume of the balloon

Let us substitute the known values in the above formula, we get

                   ρ = 2 / 5

                      = 0.4

Thus, the density of the balloon is 0.4 kg/m³

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Answer:

0.54mm

Explanation:

Given the following :

Wavelength (λ) of Soundwave in air = 0.12mm

Velocity of sound wave (v) = 340m/s

Calculate the frequency (f) :

v = fλ

Wavelength to metres

1000mm = 1 m

0.12mm = (0.12/1000)m

= 0.00012m

v = fλ

340 = F * 0.00012

f = 340 / 0.00012

f = 2833333.3 Hz

Wavelength of Soundwave in the patient:

Velocity of sound wave through body tissue = 1540m/s

Therefore,

Using v = fλ

λ = v / f

λ = 1540 / 2833333.3

λ = 0.0005435m

λ = (0.0005435 * 1000)mm

λ = 0.5435mm = 0.54mm

The distance between neighbouring, identical wave components, such as adjacent compressions, determines a sound's wavelength. The number of waves passing a spot in a given amount of time is known as the frequency, which is the same as the source's frequency.

Wavelength (λ) of Soundwave in air = 0.12 mm

Velocity of sound wave (v) = 340m/s

Calculate the frequency (f) :

v = fλ

Wavelength to metres

1000 mm = 1 m

0.12 mm = (0.12/1000)m

= 0.00012 m

v = fλ

340 = F × 0.00012

f = 340 / 0.00012

f = 2833333.3 Hz

Wavelength of Soundwave in the patient:

Sound waves travel through body tissue at a speed of 1540 m/s.

Therefore, Using v = fλ

λ = v / f

λ = 1540 / 2833333.3

λ = 0.0005435m

λ = (0.0005435 × 1000)mm

λ = 0.5435mm = 0.54 mm

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Answer:

the answer is A. 4 carbon atoms, 4 hydrogen atoms, and 2 oxygen atoms

The number of atoms of each molecule of the reactants is required.

The correct option is c. 1 carbon atom, 4 hydrogen atoms, and 4 oxygen atoms

The given reaction is

\(CH_4+2O_2\rightarrow CO_2+2H_2O\)

For carbon atoms

The only carbon atom is present in \(CH_4\)

So, 1 carbon atom

The hydrogen atoms are also present is \(CH_4\)

There are 4 hydrogen atoms.

The oxygen atoms present is \(2\times 2=4\)

So, the number of atoms present in the reactants are c. 1 carbon atom, 4 hydrogen atoms, and 4 oxygen atoms

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Answer:

I would say d sry if im wrong

Explanation:

A heat engine is a device that converts heat energy into mechanical work. In each cycle, the engine absorbs 30 000 J of heat and releases 15 000 J of heat.

This means that the engine is only able to convert a portion of the heat it absorbs into useful work. The remaining heat is released into the surrounding environment. The efficiency of a heat engine is defined as the ratio of the useful work output to the heat input. In this case, the efficiency of the engine would be 15 000 J/30 000 J or 0.5, which means that the engine is only able to convert 50% of the heat it absorbs into useful work. In order to improve the efficiency of a heat engine, engineers must work to reduce the amount of heat that is lost to the environment during each cycle. This can be done through improvements in the design of the engine, such as increasing the temperature difference between the hot and cold sides of the engine or reducing the amount of friction and resistance within the engine itself.

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According to the Evidence was critical to the development of the atomic model. Match each experimental evidence with the model it produced. evidence that led to the establishment of the atomic model was a few positive particles that were fired at a piece of gold foil and appeared to bounce back. Rutherford conducted an experiment in which he allowed alpha particles to strike the gold foil.

There are heavy particles present at the centre of an atom, as evidenced by the fact that some of the particles bounced back. There is a lot of vacant space in an atom since the majority of alpha particles pass through it.

(A) Cathode-Ray bends towards positively charged plate: Electrons orbit nucleus in fixed circular orbits.

(B) Alpha-particles pass through the gold foil, and only some were deflected: Electrons and protons embedded in the particle.

(C) Mathematically determined the number of electrons that occupy regions around the nucleus: The electrons surround a positively charged nucleus.

(D) Differing brightness of electron density around nucleus: Electrons occupy specific sections around the nucleus called orbitals.

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The average speed of the man for the whole journey is 2.25 km/hr.

The average velocity of the man for the whole journey is  2.25 km/hr.

The average speed of an object is the ratio of the total distance traveled by an object and the time taken for the journey.

The average speed of an object is given mathematically as follows:

Average speed = tota; distance / total time taken

From the data given:

Total distance traveled = 7 km + 2 km

Total distance traveled = 9 km

Total time taken = 2 + 1 + 1

Total time taken = 4 hours

Average speed = 9 km / 4 hrs

Average speed = 2.25 km/hr

The average velocity of the man for the journey is calculated as follows:

average velocity = change in displacement/change in time

The journey took place in the same direction, hence, the displacement is 9 km.

Average velocity = 9 km / 4 hrs

Average velocity = 2.25 km/hr

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There are two high and two low tides in one lunar day. This is because the Earth rotates through two tidal bulges every lunar day.

The tidal bulges are caused by the gravitational pull of the moon. The moon's gravitational pull is strongest on the side of the Earth that is closest to the moon, and weakest on the side of the Earth that is farthest from the moon. This causes the oceans to bulge out on both sides of the Earth, creating high tides. The low tides occur in between the high tides.The time between high tides is about 12 hours and 25 minutes. This is because it takes the Earth about 24 hours and 50 minutes to rotate once on its axis. However, the moon also takes about 24 hours and 50 minutes to orbit the Earth. This means that the Earth rotates through two tidal bulges every time the moon completes one orbit.

The number of high and low tides can vary slightly depending on the location of the bay. For example, bays that are located in the open ocean tend to have more frequent tides than bays that are located in the middle of a landmass. This is because the open ocean is more affected by the gravitational pull of the moon.

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Answer:

Little to no scientific advancement

More wide spread diseases

Explanation:

Answer:

Option A: Elena can work as a server for 5 hours and edit poetry for 10 hours.

Explanation:

We are given the system of linear inequalities modeling this situation as; 10.50x + 8.50y ≥ 125

x + y ≤ 17

Where;

x represents number of server working hours per week.

y represents number of editing poetry hours per week.

In option A, x = 5 and y = 10. Let's plug them both into the first equation;

10.50(5) + 8.50(10) ≥ 125

Left hand side gives 137.5. So it fulfills the inequality.

Repeating the same for the 2nd equation, we have;

5 + 10 ≤ 17

Left hand side is 15 and it fulfills the equation. Option A is correct.

In option B, x = 10 and y = 9. Let's plug them both into the first equation;

10.50(10) + 8.50(9) ≥ 125

Left hand side gives 181.5. So it fulfills the inequality.

Repeating the same for the 2nd equation, we have;

10 + 9 ≤ 17

Left hand side is 17 and it doesn't fulfill the inequality. Option B is wrong.

In option C, x = 10 and y = 1. Let's plug them both into the first equation;

10.50(10) + 8.50(1) ≥ 125

Left hand side gives 113.5. So it doesn't fulfill the inequality.

Option C is wrong.

In option D, x = 3 and y = 10. Let's plug them both into the first equation;

10.50(3) + 8.50(10) ≥ 125

Left hand side gives 116.5. So it doesn't fulfill the inequality.

Option D is wrong.

The mass moment of inertia of an object about an axis parallel to the centroidal axis is greater than the mass moment of inertia about the centroidal axis.
The centroidal axis is the axis passing through the centroid of the object. The mass moment of inertia about this axis is the minimum value of the mass moment of inertia for any axis parallel to this axis. When an object is rotated about an axis parallel to the centroidal axis, the distance of each element of the object from the axis of rotation increases. Therefore, the moment of inertia about this axis is greater than the moment of inertia about the centroidal axis.

Therefore, the mass moment of inertia of an object about an axis parallel to the centroidal axis is greater than the mass moment of inertia about the centroidal axis.

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Answer:

20 times

Explanation:

75kg × 20 = 1500kg

Amount of time greater is the force of gravity is 20 times

Given:

Mass of person = 75 kg

Mass of jeep = 1500 kg

Find:

Amount of time greater is the force of gravity

Computation:

Amount of time greater is the force of gravity = Mass of jeep / Mass of person

Amount of time greater is the force of gravity = 1500 / 75

Amount of time greater is the force of gravity = 20 times

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Answer:

hi

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 average speeds are as follows:

A) From San Antonio to Houston: 45 mi/h.

B) From Houston to San Antonio: 34.33 mi/h.

C) For the entire trip: 39.67 mi/h.

Mi/h stands for miles per hour, which is a unit of speed which measures the number of miles a vehicle or object can travel in an hour. It is commonly used in the United States and a few other countries to measure the speed of vehicles on the road. Miles per hour is often abbreviated as mph or mi/h, and one mph is equal to 1.609 kilometers per hour, which is the most common international unit of speed.

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Answer:

I just put a random number for the work

Explanation:

I hope it is ok.

True.

The conductivity of both conductors and non-conductors depends on temperature and frequency. Conductors are materials that allow electrons to flow freely through them, and the higher the temperature, the more freely the electrons can move through the conductor. This increases the conductivity of conductors. The frequency of an electric current is also a factor in the conductivity of conductors. As an electric current's frequency increases, a conductor's conductivity also increases.

Non-conductors, such as plastics, porcelains, and glass, are materials that do not allow electrons to flow freely through them. The conductivity of non-conductors also depends on temperature and frequency. As the temperature increases, the more freely the electrons can move through the non-conductor, which increases its conductivity. The frequency of an electric current also affects the conductivity of non-conductors. As the frequency increases, the conductivity of a non-conductor also increases.

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Answer:

75. 5 Hz

Explanation:

velocity = frequency × wave length

1510 = frequency × 20

frequency = 1510÷20 = 75.5 Hz

can you mark my answer brainliest please ♥️...

For parallel combination:

Total Resistance :   \(\frac{1}{Rp} = \frac{1}{R1} + \frac{1}{R2} + \frac{1}{R3}\)

Current is the overall flow of electrons through a conductor and can be defined as the speed of the flow of electrons. Resistance is defined as the opposition to the current flow. Circuits must have resistance to convert electrical energy into light, heat, or motion. Resistance is called the directional movement of electrons that form an electric current. It is also known that electrons do not move freely in the crystal structure of a conductor. Resistance is the inherent opposition to the flow of electrons present in a conductor. Inductance is the property of any circuit to resist any change in the current while capacitance is the property of the circuit to resist any change in voltage

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When the light was turned on in the aquarium, the amount of carbon in the form of carbon dioxide (CO2) decreased as a result of the photosynthesis that the plants were performing.

Generally speaking, the carbon is flowing from the water (in the form of carbon dioxide) into the plants through photosynthesis, and then into the fish when they consume the plants.

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Answer: A force can change the direction in which an object is moving

Explanation: A bigger force of an object will produce a bigger change in motion

Answer:

\(\boxed {\boxed {\sf 96 \ m/s}}\)

Explanation:

We are asked to find the final velocity of the car given the acceleration and time. We can use the following kinematics equation to calculate the final velocity.

\(v_f=v_i+(a \times t)\)

The car starts from rest, so the initial velocity is 0 meters per second. It accelerates a rate of 40 meters per square second over a period of time of 2.4 seconds.

Substitute the values into the formula.

\(v_f= 0 \ m/s + ( 40 \ m/s^2 \times2.4 \ s)\)

Solve inside the parentheses.

\(v_f= 0 \ m/s + (96 \ m/s)\)

Add.

\(v_f= 96 \ m/s\)

The final velocity of the car is 96 meters per second.

The given sequence does converge. It converges to 4. To determine if the given sequence converges, we need to analyze its pattern.

The sequence is defined as {4- (3)}** n=0, where n represents the index of the term in the sequence. The expression within the braces, 4- (3), suggests that each term is obtained by subtracting 3 multiplied by the previous term from 4.

Let's calculate a few terms to observe the pattern:

Term 0: 4 - (3)* = 4 - 0 = 4

Term 1: 4 - (3)4 = 4 - 12 = -8

Term 2: 4 - (3)(-8) = 4 + 24 = 28

Term 3: 4 - (3)*28 = 4 - 84 = -80

From the calculations, it is clear that the sequence does not converge to a specific value. Instead, it oscillates between positive and negative values, never settling down to a single value. Therefore, the given sequence does not converge.

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Answer:

Hello friend where is the figure of the question

The frequency is the number of waves that traverse a spot in a specific amount of time.

the quantity of times something happens in a certain amount of time. -the number of waves passing a point per second is the frequency of a wave. - The hertz is a measure of frequency ( Hz ). One event occurs every second in a hertz. Shorter wavelengths will equate to lower frequencies if the speed is remained constant.

The frequency of a wave determines its properties. The quantity of waves that pass through a specific spot in a unit of time is known as frequency. Hertz is the S.I. unit for frequency (Hz).

For instance, if a wave travels through a spot in 0.5 seconds, its frequency will be 1 0.5 = 2 Hz.

As a result, two waves will go through that location in a second.

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Katherine Johnson accepted that the meetings were only for men and didn't ask to attend.

Meetings are when two or more people get together to talk about one or more topics, frequently in a formal or business setting, though they can also happen in a variety of other settings. Group decision-making can be done during meetings.

A meeting is a gathering of two or more individuals called for the express purpose of engaging in verbal interaction in order to accomplish a common objective, such as exchanging information or coming to a consensus. Face-to-face meetings can take place virtually through the use of communications technology, such as a telephone conference call, a skped conference call, or a videoconference.

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