a ball moves with a constant speed of 4 m/s around a circle of radius 0.25 m. what is the period of the motion? [hint: for this calculation, you need to know the circumference of the circle.

The crew aboard a small sailboat should be briefed to follow specific instructions when their boat is being towed.

When a small sailboat is being towed, the crew should adhere to the following instructions:

Secure all loose items: The crew should secure any loose items on the boat to prevent them from shifting or falling overboard during the towing process. This includes stowing equipment, sails, and personal belongings in appropriate storage spaces.

Maintain communication: The crew should establish clear communication with the towing vessel to ensure a smooth towing operation. They should follow the instructions given by the towing crew and relay any concerns or issues promptly.

Stay alert and ready to assist: While being towed, the crew should remain vigilant and ready to assist if needed. They should be prepared to help with maneuvers, follow the towing vessel's directions, and be mindful of potential hazards in the water.

By following these guidelines, the crew of a small sailboat can contribute to a safe and successful towing operation, minimizing risks and ensuring a smooth journey.

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The work done upon the cart and the subsequent potential energy change is 13.2 J.

Force on the cart that is being pulled = F = 20.8 N

Weight of cart that is being pulled = W = 3 Kg

Height of the inclined plane = h = 0.636 m

The work done upon the cart = w =

= w = F X h X cosθ

Here, the angle is zero and angle is denoted by 'θ'. Thus, θ = 0.

Therefore, work done = w =

= w = F X h X cosθ

= w = 20.8 X 3 X 1    [ as cosθ =1 ]

= w = 13.2 J

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Answer:

When several resistors are connected in series, the total resistance equals the sum of the individual resistors. In series combination, the current is same through each resistor.

1)   V=  60 volt

Total resistance R = R₁ + R₂

                              = 20 + 10

                              = 30 Ω

2) Ohms law states that,

           \(\sf I =\dfrac{V}{R}\\\\\\I = \dfrac{60}{30}\\\\I = 2 \ A\)

3) Voltage around 10 Ω resistor,

          V₂ = I R₂

             = 2 * 10

              = 20 volt

___________________________________________________

4) Total current = 1 A

5) Total voltage = 8 volt

6) Voltage around R₁ is V₁

              R₁ = 2 Ω  ; I = 1 A

              V₁ = IR₁

                   = 1 * 2

                   = 2 volt

7) Resistance 2:

        Total resistance = R

        Total voltage = V = 8 volt

        Total current = I = 1 A

                  \(\sf R = \dfrac{V}{I}\\\\\\ R = \dfrac{8}{1}\\\\\)

                  R = 8 Ω

               R₁ + R₂ = 8 Ω

                2 + R₂ = 8

                      R₂  = 8 - 2

                      R₂ = 6 Ω

8)Voltage around R₂:

                  \(\sf V_2 = IR_2\\\\V_2 = 1*6\\\\\)

                  V₂ = 6 volt

9) Total R = 8 Ω

_________________________________________________

10) Total V = 12 volt

11)  Total R = 8 + 8

                 = 16 Ω

12) Total current I,

                \(\sf I = \dfrac{V}{R}\\\\I = \dfrac{12}{16}\\\\I = 0.75 \ A\)

13) Voltage at each resistor:

           V₁ = I*R₁

               = 0.75 * 8

               = 6 volt

         V₂ = I*R₂

              = 0.75 * 8

             = 6 volt

_______________________________________________________

     14) Total R =   40 + 20

                       = 60 Ω  

15) To find V₁, first find total voltage.

           I = 2 A ;  R = 60 Ω  

           V = IR    

              = 2 * 60

               = 120 V

        V₁ + V₂  =V

        V₁ + 80 = 120

                V₁ = 120 - 80

                 V₁ = 40 volt              

The final answer are gravity has a more significant effect on an object's motion than air resistance does.

When forces are supplied by gravity, changing the mass has a different effect on velocity than when forces are supplied by a rubber band. why changing the mass has a different effect on the speed when gravity provides the forces compared to when the force is provided by a rubber band?

When a force is supplied by a rubber band, the motion of the object can be observed. When an object is propelled using rubber bands, the effect of changing mass on the speed is almost constant. When a force is supplied by gravity, changing the mass has a different effect on velocity.

When an object is dropped, it will accelerate at a constant rate regardless of its mass because it is not impeded by air resistance. This constant rate of acceleration is known as the acceleration due to gravity. Furthermore, the mass of the object would not affect the force of gravity acting on it.

Therefore, the mass of an object does not have an impact on its acceleration due to gravity.However, the mass of the object would affect how it interacts with the force of air resistance, which opposes its motion and slows it down.

Air resistance is proportional to the cross-sectional area of the object and the density of the medium through which it travels. As a result, an object with a greater mass would have a greater surface area, which would result in more air resistance.

This implies that a heavier object would have a lower terminal velocity than a lighter object with the same surface area. When an object is dropped, it accelerates until it reaches its terminal velocity, which is the maximum velocity it can reach while falling, and then it falls at a steady rate because it is not impeded by air resistance.

So, gravity has a more significant effect on an object's motion than air resistance does.

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Answer:

distance travelled is 80

The ideal gas law relates the pressure (P), volume (V), temperature (T), and number of moles (n) of a gas through the equation PV = nRT, where R is the universal gas constant. The volume comes as 3.96 L

This equation can be rearranged to solve for any of the variables, given the others. In this problem, we are given the initial conditions of a sealed helium balloon with a volume of 2.0 L at the surface of the Earth, where the temperature is 20.0 °C.

We can use the ideal gas law to calculate the initial number of moles of helium in the balloon: PV = nRT, n = PV / RT, n = (1 atm x 2.0 L) / (0.0821 L·atm/mol·K x 293 K) n = 0.162 mol

Now, we need to calculate the final volume of the balloon when it rises to a height where the pressure is 1/5 that at the surface of the Earth, and the temperature is 8.0 °C.

Since the number of moles of helium in the balloon remains constant, we can use the ideal gas law again to solve for the final volume: PV = nRT, V = nRT / P, V = (0.162 mol x 0.0821 L·atm/mol·K x 281 K) / (1/5 atm) V = 3.96 L

Therefore, the volume of the balloon at the new altitude is approximately 3.96 L. It is important to note that this calculation assumes that the balloon behaves as an ideal gas, which may not be entirely accurate in real-world conditions.

Additionally, there may be other factors at play, such as the effect of air currents on the balloon's movement, which could impact the final volume.

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Where a tap supplies water at 26°c while another supply at 82°c. If a man wishes to bath with water at 40°c, then the ratio of the mass of hot water to that of cold water is: 1/3.

The ratio of the mass of hot water to that of Cold water is determined as follows:

M₁C (82  40) = M₂C (40-26)

Where M₁C is the Mass of Tap 1; and

M₂C is the Mass of Tap 2.

Thus,

M₁C (82  40) = M₂C (40-26)

M₁/M₂ = 14/42

= 1/3

Thus, it is right to state that the ratio of the mass of hot water to that of cold water is: 1/3.

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Answer:

Explanation: the table shows during an experiment

Gravitational forces are strongest between objects with identical masses,  claims are supported by the data. Option B is correct.

Newton's law of gravity states that each particle having mass in the universe attracts each other particle with a force known as the gravitational force.

Gravitational force is proportional to the product of the masses of the two bodies and inversely proportional to the square of their distance.

When mass increases and distance reduces, gravity rises. Gravity also lowers when the distance between two points grows and the mass decreases.

From the table, it is observed that gravitational forces are strongest between objects with identical masses,  claims are supported by the data.

Hence, option B is correct.

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Answer:

20 meters.

Explanation:

In the graph, the x-axis (the horizontal axis) represents the time, while the y-axis (the vertical axis) represents the distance.

If we want to find the distance covered in the first T seconds, you need to find the value T in the horizontal axis.

Once you find it, we draw a vertical line, in the point where this vertical line touches the graph, we now draw a horizontal line. This horizontal line will intersect the y-axis in a given value. That value is the total distance travelled by the time T.

In this case, we want to find the total distance that David ran in the first 4 seconds.

Then we need to find the value 4 seconds in the horizontal axis. Now we perform the above steps, and we will find that the correspondent y-value is 20.

This means that in the first 4 seconds, David ran a distance of 20 meters.

Answer:

Explanation:

egg of an ostrich is the biggest

The sound travelled through glass in meters per second (m/s) is 4540 m/s .Because air is so easy to compress.

The typical glass material is not only much denser but also much stiffer than air. For air the sound speed is around 330 m/s under conventional circumstances. Sound speeds range from 2000 m/s to 6000 m/s for the majority of typical glass materials, depending on the type of glass and the type of sound.

Windows are one of the most common sources of exterior noise intrusion from everyday irritants like pedestrians, traffic, and construction because glass easily transmits sound vibrations.

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Titan is able to retain its atmosphere because it is very cold. The average temperature on Titan is -180 degrees Celsius, which is cold enough to liquefy methane.

The methane in Titan's atmosphere is very dense, which helps to keep the atmosphere from escaping.

Titan is also very far from the Sun, which means that it is not bombarded with the same amount of solar radiation as Earth. This solar radiation can cause the atmosphere of a planet to expand and escape.

Finally, Titan has a very thick atmosphere, which helps to keep the atmosphere from escaping. The atmosphere of Titan is about 100 times thicker than the atmosphere of Earth.

All of these factors contribute to Titan's ability to retain its atmosphere.

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In context to the given question the answer is yes, greenhouse gases provide great impact global temperatures. Climate scientists totally appreciate and agree that increasing levels of carbon dioxide and other greenhouse gases are severely and directly linked to the increasing global temperatures.

Greenhouse gases aids to absorb heat radiating from the Earth’s surface and re-release it in all directions—involving back toward Earth’s surface. The concept of not having carbon dioxide will conclude and make the Earth’s natural greenhouse effect  too weak comparatively than before to keep the average global surface temperature above freezing.

The IPCC have predicted and forecasted that greenhouse gas emissions will carry on and lead to increase over the next few decades. The result being severe, they forcasted that  the average global temperature will gradually increase by about 0.2 degrees Celsius per decade.

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Currently, the largest optical telescope mirrors have a diameter of a  20 m , so option d is  is correct.

The largest optical telescope mirrors have a diameter of a 20m.However, please note that technology and advancements in telescope construction are continuously evolving, so it's possible that larger telescope mirrors have been developed since then. It's always a good idea to consult the latest sources or refer to current astronomical news for the most up-to-date information.An optical telescope is a telescope that gathers and focuses light mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct visual inspection, to make a photograph, or to collect data through electronic image Therefore option d is correct option.

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The final temperature of the two cups of water being mixed together, given that one cup has a temperature of 30 °C and the other has 75 °C, is  58.13 °C

To obtain the final temperature of the two cups of water, we must obtain the equilibrium temperature of the two cups of water mixture. Details below:

Heat loss by cup 2 = Heat gain by cup 1

MᵥᵥC(Tᵥᵥ - Tₑ) = MC(Tₑ - T)

250 × 4186 (75 - Tₑ) = 150 × 4186(Tₑ - 30)

1046500(75 - Tₑ) = 627900(Tₑ - 30)

Clear bracket

78487500 - 1046500Tₑ = 627900Tₑ - 18837000

Collect like terms

78487500 + 18837000 = 627900Tₑ + 1046500Tₑ

97324500 = 1674400Tₑ

Divide both side by 1674400

Tₑ = 97324500 / 1674400

Tₑ = 58.13 °C

From the above calculation, the equilibrium temperature is 58.13 °C.

Thus, we can conclude that the final temperature of the two cups of water is 58.13 °C

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Answer:

Explanation:

HCE 20 ADIASM EPEGURNTE   MSIMOLO

A hockey player is standing on his skates on a frozen pond, if he accelerates uniformly at 0.22 m/s2, the player will catch his opponent in 19.49 seconds.

Uniform Motion

The object's uniform motion should follow the following rules as provided

vt = vo + at

vt² = vo² + 2a . s

s = vo*t + 1/2*a*t²

Here vt is seen as the final velocity, vo = initial velocity

a= acceleration t= time and s= displacemnt

according to the question,

v = 2

t= 1.4

vo= 0 m/s

a = 0.22 m/s²

The distance between the players is seen as

Vt= 2x 1.4 = 2.8 m

The player will thus catch his opponent with the same distance. This means,

Sopponent = Splayer

so + vt = vo*t + 1/2 at²

⇒ 2.8 + 2.t = 0 . t + 1/2 . 0.22 . t²

⇒ 0.11t² - 2t - 2.8 = 0

⇒ t = 19.49 s

on solving the above quadratic equation, we calculate the possible root as 19.49 seconds.

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The acceleration of the block is 6.4 m/s².

To calculate the acceleration of the block, we need to consider the forces acting on it.

The applied force is 40 N, and since it is the only horizontal force in the direction of motion, it is the net force acting on the block.

The frictional force opposing the motion is 8 N.

The acceleration, we can use Newton's second law, which states that the net force acting on an object is equal to its mass multiplied by its acceleration (F = ma).

The net force is the difference between the applied force and the frictional force:

40 N - 8 N = 32 N.

Now, we can plug the values into Newton's second law:

32 N = 5 kg × a.

Solving for the acceleration (a), we get

a = 32 N / 5 kg

a = 6.4 m/s².

Therefore, the acceleration of the block is 6.4 m/s².

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The percent error of the student's measurement can be calculated using the following formula: Percent Error = (|measured value - accepted value|/accepted value)*100.

In this case, the measured value is 3.5x10 m/s and the accepted value is 3.0x10 m/s. Plugging this into the formula gives us: Percent Error = (|3.5x10 m/s - 3.0x10 m/s|/3.0x10 m/s)*100 = 16.67%.

The percent error is a measure of how accurate a measurement is in comparison to an accepted value.

In this case, the student's measurement of the speed of light was 16.67% different from the accepted value, indicating that their measurement was not very accurate.

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The wavelength of an ultrasonic wave with a frequency of 1.0×10^5 Hz, given the speed of sound in air as 340 m/s, is approximately 3.4 mm.

The wavelength of a wave can be calculated using the formula λ = v/f, where λ represents the wavelength, v is the velocity or speed of the wave, and f is the frequency of the wave.

In this case, the frequency is given as 1.0×10^5 Hz, and the speed of sound in air is 340 m/s. By substituting these values into the formula, we can determine the wavelength.

λ = 340 m/s / (1.0×10^5 Hz) = 3.4×10^-3 m = 3.4 mm

Therefore, the wavelength of the ultrasonic wave emitted by bats, with a frequency of 1.0×10^5 Hz, is approximately 3.4 mm.

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Answer:

I think your bones, muscles, and joints your welcome :)

Explanation:

Answer:

Repel each other.

Explanation:

Van de Graaff generator is a device that was invented in 1929, by an American physicist called Robert J. Van de Graaff.

A Van de Graaff generator refers to an electrostatic generator that typically involves the use of a moving belt to accumulate electric charge on a hollow globe that is made from metal placed on top of an insulated column and thereby, creating very high electric potentials i.e very high voltage-direct current (DC) electricity at low current levels.

Generally, when we touch a Van de Graaff generator, our hair may stand up if it is dry. This happens only if the strands of our hair repel each other because they are like charges i.e having the same potentials.

When light reflects from a surface, there is no change in its speed, frequency, or wavelength. The correct option is "none of the above."

Reflection occurs when light waves strike a surface and bounce off. During reflection, the light wave remains unchanged in terms of its speed, frequency, and wavelength. The speed of light in a given medium is determined by the properties of that medium and remains constant unless the light enters a different medium. The frequency of light refers to the number of wave cycles passing a given point per unit time. This property is intrinsic to the light source and remains constant during reflection. Similarly, the wavelength of light, which is the distance between two consecutive peaks or troughs of a wave, also remains unchanged during reflection.However, it is worth noting that the intensity or amplitude of the reflected light may change depending on factors such as the angle of incidence and the characteristics of the reflecting surface. But in terms of the fundamental properties of light waves, namely speed, frequency, and wavelength, there is no change during reflection.

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Nicolaus Copernicus was the first person to propose the heliocentric model of the solar system, in which the Sun, not the Earth, is at the center.

Copernicus lived during the Renaissance and was an astronomer and mathematician. He proposed his heliocentric model in his book "De Revolutionibus Orbium Coelestium" (On the Revolutions of the Celestial Spheres) published in 1543. In this model, Copernicus argued that the Earth and the other planets revolve around the Sun, and not the other way around as was commonly believed at the time. This challenged the geocentric model of the universe, which placed the Earth at the center.

Copernicus' heliocentric model was based on observations and calculations he made using instruments like the astrolabe and the armillary sphere. He also relied on the work of earlier astronomers like Aristarchus of Samos and Ptolemy. Copernicus' model helped to explain phenomena like retrograde motion and the varying brightness of planets.

Copernicus' heliocentric model was a major shift in the way people thought about the universe, and paved the way for later scientific discoveries. It challenged long-held beliefs and led to a greater understanding of our place in the cosmos. Copernicus' work is considered a cornerstone of modern astronomy.

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Answer:

A concave mirror is used.

Explanation:

start a fire using a mirror to focus sunlight.

A concave mirror is used as a light concentrator.

When the object is placed at the infinity, the image is formed at focus.

So, the light is focused at the focus and thus the fire is started.

Answer:

1. Privacy

-The state or condition of being free from being observed or disturbed by other people.

2. Commitment

-The state or quality of being dedicated to a cause, activity, etc.

3. Profile

-There are multiple answers for this word so I'm not sure which is the one you need.

4. Widow

-A woman who has lost her spouse by death and has not remarried.

5. Aristocrat

-A member of the aristocracy.

6. Affordable

-Inexpensive; reasonably priced.

7. Variable

-A symbol for a value we don't know yet. It is usually a letter like x or y.

Explanation:

Her moment of inertia would be greater if she held her arms out in front of her rather than at her sides. Assume that the mass of her extended arm is at a distance of 30 cm from the center of the mass.

For instance, the speed of the skater's spin decreases twofold when she spreads her arms outside, doubling the moment of inertia. She dramatically reduces her moment of inertia while tucking her arms in, resulting in a considerable increase in rotational velocity.

According to the conservation of angular momentum, as the hands and legs are brought close to the rotational axis, the rotational inertia reduces, boosting the skater's angular velocity. A rise in angular speed indicates an increase in kinetic energy.

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Answer:

d. zero

Explanation:

Constant velocity means the acceleration is zero. In this case the velocity does not change,

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