5. There is a bell at the top of a tower that is 45 m high. The bell's mass is 200 kg. The bell has energy. Calculate it.





45000


900000 J


9000 J


88200 J

Answer:

Kinetic energy

Explanation:

Kinetic = movement or something

the ball moved, sounds like kinetic.

Answer: Inelastic: Elastic= 1:2

Explanation:

Answer:

Rheostat, adjustable resistor used in applications that require the adjustment of current or the varying of resistance in an electric circuit. The rheostat can adjust generator characteristics, dim lights, and start or control the speed of motors.

Explanation:

The magnitude of the electric field is 1.20 x 10^7 N/C if the magnitude of the electric field if the string with a 7-gram ball carrying a charge of 4x10-9 C. Thus, option b is correct.

The given data is as follows:

Weight of ball = 7-gram

Charge of 4x10-9 C

Angle = 35 degrees

The electric field is described as the force per unit charge in a substance. The electric field  is calculated by using the formula,

E = mg / q * tan(θ)

g is the acceleration due to gravity.

E = (0.007 kg)(9.81 m/s^2) / (4x10^-9 C) * tan(35°)

E = 1.20 x 10^7 N/C

Therefore, the magnitude of the electric field is 1.20 x 10^7 N/C.

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Kinetics defines the forces that create motion or are generated from moving. this can include ground reaction force, friction, torque, or internal muscle forces.

A fundamental concept in physics is a force, defined as an action on an entity that causes a change in the motion of an object. It is one of the most important ideas in physics because of its many applications in everyday life. There are two types of forces: contact forces and non-contact forces. A contact force is a force that requires two things to come into direct physical contact. Friction, tension, and applied loads are examples of contact forces. In contrast, non-contact forces do not require direct physical contact between two things.

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The time taken by the sled to come to a stop after the rocket turns off is calculated to be 6.93 s.

Generally the velocity attained by the sled after t = 2.7 s is mathematically evaluated using the kinematic equation as follows,

v = u + a t

As, u = 0, a = 14.5 m/s²

v = 0 + 14.5 (2.7) = 39.15 m/s

s is the distance it covers in this time.

s = u t + 1/2 a t² = 1/2 × 14.5 × 2.7² = 52.85 m

Now, when sled stops its the final velocity is v f = 0, while the initial velocity will be the velocity after its acceleration i.e, v = 39.15 m/s.

So, v f = v + a₁ t₁

-39.15 = 2.7 a₁

a₁ = -14.5 m/s²

As a₁ is negative, it is said to be deceleration.

0 = 39.15 - 5.65 t₁

5.65 t₁ = 39.15

t₁ = 6.93 s

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The Planck equation and rules of direct proportions can be found that the amount of energy emitted by sodium the answer is;

              E = 2.2 10⁻¹³ J

Planck's equation establishes a relationship for the energy of photons

          E = h f

          c = λ f

          E = \(\frac{h \ c}{\lambda}\)

Where E is the energy, h the Planck constant (h = 6.63 10⁻³⁴ J s), f the frequency of radiation, c the speed of light and λ the wavelength

The energy emitted by each sodium atom is the energy of the emitted radiation that has a wavelength of 590 nm, two lines close together, indicate that each atom emits a photon, its energy is

             E₀ =  \(\frac{6.63 \ 10^{-34} \ 3 \ 10^8}{ 590 \ 10^{-9}}\)

             E₀ = 3.37 10⁻¹⁹ j

We look for the mass of a mole of sodium in the periodic table

             PM = 29.9897uma ( \(\frac{1.66 \ 10^{-17} kg}{1 una}\)) = 49.78 10⁻²⁷ kg

With a direct rule of proportions we can find the atoms of sodium in the lamp. If in mol of sodium it has a mass 49.78 10⁻²⁷ kg and has avogadro number 6.022 10²³ atoms. How many atoms are there in 45.8 10⁻⁹ kg

               # sodium atoms = \(\frac{49.78\ 10^{-27} \ 6.022 \ 10^{23}}{ 45.8 \ 10^{-9}}\)

               #_atom Sodium = 6.54 10⁵ Sodium atoms.

Let's use a direct ratio rule, If a sodium atom emits an energy Eo, how much energy do you emit? 6.54 105 atoms

              E = Eo  # _atmos / 1 atom

              E = 3.37 10⁻¹⁹ 6.54 10⁵

              E = 2.2 10⁻¹³ J

In conclusion, using the Planck equation and direct proportions rules we can find the amount of energy emitted by sodium, the answer is;

              E = 2.2 10⁻¹³ J

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The work done when pushing with a force of 500 N against a wall for 30 seconds is 15,000 joules (J).

Work is defined as the product of force and displacement in the direction of the force. In this case, since the wall is stationary and does not move, there is no displacement in the direction of the force. Therefore, no work is done on the wall. However, the person pushing against the wall is expending energy and doing work on their own body. The energy expended can be calculated using the equation W = F x d, where W is work, F is force, and d is distance or displacement. In this case, there is no displacement, so we can use the simplified formula W = F x t, where t is time. Thus, the work done by the person pushing against the wall can be calculated as W = 500 N x 30 s = 15,000 J.

When you push with a force of 500 N against a wall for 30 seconds, the work done by you is 15,000 J. However, no work is done on the wall as there is no displacement in the direction of the force.

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Typically, operant conditioning is the method we employ when we are training our canines. The outcome is now determined by the dog's conduct.

In order to comprehend how the human brain interprets experiences, gestalt psychology is a school of thinking. It implies that structures have unique qualities that distinguish them from the sum of their constituent pieces when taken as a whole.

The Gestalt principle of similarity describes how humans combine information by comparing the similarity of items if closeness is determined by position. For instance, we would classify them as cats and dogs if there were five dogs of various varieties and five cats of various breeds.

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Cartoon Analysis of Immigration in the Gilded age between 1882 and 1896 – A stereotypical Jewish immigrant is trying to enter the country via a gate that reads "United States of America: Admittance free. Walk in!" holding bags that say "superstition," "disease," "anarchy," "poverty," "sabbath desecration," and similar phrases.

One of the biggest mass migrations in human history occurred in the late nineteenth century. Numerous immigrants from other regions of North America, as well as those from Asia and Europe immigrated to the United States. Many difficulties awaited immigrants who came to the United States largely for the economic opportunities provided by industrialization. The large number of immigrants that arrived altered American culture and created new social issues. This sparked a discussion on immigration, citizenship, and restrictions on immigration among the local populace. During the Gilded Age, a sizable portion of immigrants were from Asia and Eastern Europe. Different opinions on the immigration surge are depicted in cartoons from the time. Some people welcomed these immigrants in the Gilded age as a fresh supply of inexpensive labour, while others viewed them with distrust.

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Answer:

391.67Hz

Explanation:

The fundamental frequency formula in string is expressed as;

Fo = V/2L

V is the velocity of the wave = 329m/s

L is the length of the string = 42cm = 0.42m

Substitute

Fo = 329/2(0.42)

Fo = 329/0.84

Fo = 391.67Hertz

Hence the  fundamental frequency of a mandolin string is 391.67Hz

Upon arrival, the spacecraft is first put into a circular orbit around mars. the period of the orbit is 132 minutes. 3.39 × 10³ km is the altitude of the orbit.

We can use the formula given below to find the altitude of the orbit:

T² = 4π²a³/GM

where,  T is the period of orbit,a is the semi-major axis,G is the

gravitational constant, M is the mass of the planet

We know that the period of orbit (T) is 132 minutes or 132 × 60 seconds =

7920 seconds.

We also know that Mars has a mass of 6.39 × 10²³ kg and a gravitational

constant of 6.674 × 10⁻¹¹ Nm²/kg².

To find the altitude of the orbit, we need to find the semi-major axis (a)

using the formula given above.

T² = 4π²a³/GM

a³ = T²GM/4π²

a = (T²GM/4π²)¹/³

Now, substituting the given values in the above formula, we get:

a = [(7920)² × (6.674 × 10⁻¹¹) × (6.39 × 10²³)/(4π²)]¹/³

a = 3.39 × 10⁶ m

Therefore, the altitude of the orbit is equal to the semi-major axis minus

the radius of Mars.

Altitude = a - R Where, R is the radius of Mars.

The radius of Mars is 3389.5 km.

Therefore, Altitude = 3.39 × 10⁶ - 3389.5 km, Altitude = 3.39 × 10³ km

Hence, the altitude of the orbit is 3.39 × 10³ km.

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The amount of work done by a heat engine can be calculated using the first law of thermodynamics. According to this law, the work done by the system is equal to the difference between the heat input and the heat output.

In a heat engine, heat is supplied to the system from a high-temperature reservoir and some of this heat is converted into work. The remaining heat is released to a low-temperature reservoir, typically the environment.

To determine the amount of work done, subtract the heat released to the environment from the heat input to the system. This can be expressed as:

Work = Heat input - Heat released

It's important to note that the efficiency of a heat engine is determined by the ratio of the work output to the heat input. The efficiency is given by the equation:

Efficiency = (Work output / Heat input) * 100%

In summary, the work done by a heat engine is calculated by subtracting the heat released to the environment from the heat input to the system. The efficiency of a heat engine is determined by the ratio of work output to heat input.

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Answer:

d.) Newton's first law

Explanation:

This is also called the law of inertia, which means that an object in motion will not stop unless a force is acted upon it, and vice versa. Try this out with a piece of paper and a quarter. Pull the paper from under the quarter slightly quick, and the quarter will stay on the table. Hope i helped you.

Answer:

50 cm3 of 1M hydrochloric acid is a six-fold excess of acid. In this reaction, the magnesium and acid are gradually used up. However the acid is in excess, so it is mainly the loss of magnesium (surface area becomes smaller) that causes the change in the rate.

Explanation:

The equation for the reaction is: magnesium + hydrochloric acid → magnesium chloride + hydrogen

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)

Students follow the rate of reaction between magnesium and the acid, by measuring the amount of gas produced at 10 second intervals.

3 cm of magnesium ribbon typically has a mass of 0.04 g and yields 40 cm3 of hydrogen when reacted with excess acid. 50 cm3 of 1M hydrochloric acid is a six-fold excess of acid.

In this reaction, the magnesium and acid are gradually used up. However the acid is in excess, so it is mainly the loss of magnesium (surface area becomes smaller) that causes the change in the rate.

If a graph of volume (y-axis) against time (x-axis) is drawn, the slope of the graph is steepest at the beginning. This shows that the reaction is fastest at the start. As the magnesium is used up, the rate falls. This can be seen on the graph, as the slope becomes less steep and then levels out when the reaction has stopped (when no more gas is produced).

The reaction is exothermic, but the dilute acid is in excess and the rise in temperature is only of the order of 3.5˚C. There is some acceleration of the reaction rate due to the rise in temperature. Some students might notice the flask becoming slightly warm and they could be asked how this would affect the rate of reaction, and how they might adapt the experiment to make it a ‘fair test’.

Additional information

This is a resource from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry. This collection of over 200 practical activities demonstrates a wide range of chemical concepts and processes. Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Practical Chemistry activities accompany Practical Physics and Practical Biology.

To solve this we must be knowing each and every concept related to Le Chatelier′s Principle. Therefore, when concentration of hydrochloric acid was changed. the concentration of product will also change.

When a stress is given to a chemical system in equilibrium, the equilibrium shifts to alleviate the tension, according to Le Chatelier′s Principle. In other words, it can anticipate the outcome of a chemical reaction with response to changes in temperature, concentration, quantity, or pressure.

While Le Chatelier's concept can be used to anticipate the reaction to a change from equilibrium, it doesn't explain why the system behaves as it does (at the molecular level).

Mg(s) + 2 HCl(aq) \(\rightarrow\) MgCl\(_2\)(aq) + H\(_2\)(g)

According to  Le Chatelier′s Principle, when concentration of hydrochloric acid was changed. the concentration of product will also change.

Therefore, when concentration of hydrochloric acid was changed. the concentration of product will also change.

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Answer:

Required distance is 103 miles and the required time is 1 hour

Explanation:

Given;

speed of the car, v = 103 miles per hour

Speed is the given as the ratio of distance traveled to time taken for the motion.

The distance it will take another car to catch up to them from a complete stop is 103 miles and the time it will take the car is 1 hour.

Therefore, required distance is 103 miles and the required time is 1 hour.

A body moving with a constant velocity along, a Straight line ABC, takes 45 minutes to go from a to b.

The velocity of an object is the main determinant of its position and speed. It measures how far an object moves in a given amount of time. The definition of velocity is the distance that an object travels in one unit of time.

The equation v = s/t denotes the vector quantity velocity (v), which quantifies displacement (or change in location, s), over change in time (t). Speed (or rate, r) is a scalar quantity that quantifies the distance traveled (d) over the change in time (t) and is represented by the equation r = d/t (t). The velocity of a moving object refers to how quickly it is moving in that direction. as quickly as a car traveling north on a highway or a rocket taking flight.

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The acceleration of the box of mass 2 kg is 3.336 m/s².

Acceleration is any change in the speed or direction of motion. An object is accelerating when it's speeding up, slowing down, or not moving in a straight line.

To calculate the acceleration of the 2 kg box, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 2

Hence, the acceleration of the box is 3.336 m/s².

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Answer:

I think the answer is B. Can I have brainlest if I am right, please?

Explanation:

Answer:

it is B because period =1/ frequency and B has lower period

Answer:

G

Explanation:

Fossil fuels e.g., coal, oil and gas are non renewable energy sources because they take years to form.

force= mass × acceleration

Answer:

1.F = 256 N

2.a = 8 m/s/s

By looking at the given information, you know force, and an acceleration. Therefore you have enough information to use the first formula.

F = ma

256 N = m * 8 m/s/s

m = 256 N/8 m/s/s

m = 32 Kg

Answer:

75m/s= speed

distance travelled per unit time = speed

40km/h = speed

100 mi/h south = velocity.

15m/s^2 = acceleration

speed and direction = velocity

A boy walking 50 m/min north = velocity

speeding up on the freeway = speed

A baseball travelling 90 mi/h towards home plate = velocity

Turning left to a stop sign = velocity

A dog running 15 km/s = speed

slowing down at the red light = acceleration.

Answer:

The horizontal speed of the ball is constant where there is little resistance from the air

Explanation:

From the given parameters of the ball, we have;

The horizontal speed of the ball = 4.0 m/s

The height of the cliff from which the ball is launched = 24.6 meters

The direction in which the ball is launched = Horizontally

The components of the forces acting on the ball are;

The vertical force = The Earth's gravitational attraction

The horizontal force = 0 N (There are no horizontal forces acting on the ball)

According to Newton's first law of motion, the ball will continue in its uniform motion or in its rest state unless acted upon by a force

Therefore, given that there are no horizontal forces component acting on the ball, (little air resistance) the ball will continue with the initial horizontal velocity, such that the horizontal velocity of the ball remains constant.

Answer:

Explanation:

Definitely NOT! Mass is unchanging, wherever you go. On the moon you will have the same mass as you will on the earth. Mass is just a measure of the matter that makes up a body. Weight, however, is dependent upon the pull of gravity which is different on earth than it is on the the moon, for example.

Mass doesn't change with proximity whereas weight can.

Answer: No

Explanation: The terms'mass' and 'weight' are frequently used interchangeably, yet they have distinct meanings. Your mass remains constant regardless of where you are in the universe; nevertheless, your weight varies. The mass of anything is a measure of how much power is required to change its course.

One of the ways to help someone not to be influenced by media is:

This refers to the effects and reactions which the mass media has on the people who listen to them by shaping their views and by controlling the narrative.

With this in mind, we can note that if a person is overtly influenced by the media, then such a person lacks independent thinking and becomes emotional by what he watches on the television or reads from an online source.

This can be changed through the encouragement of independent thinking, and the need to check for factual information from the media news and also to focus more on studies.

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To find the unemployment rate, we first need to determine the number of unemployed individuals in Country X. We can do this by subtracting the number of employed individuals from the labor force:

200,000 - 175,000 people are unemployed.

25,000 unemployed people

(25,000 / 200,000) times 100 equals the unemployment rate.

12.5% is the unemployment rate.

Therefore, Country X has a 12.5% unemployment rate.

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