In part 5, after the zinc is added, not only does copper metal appear, as is shown in the chemical equation given, but bubbles also appear. This is due to a single replacement reaction between Zn(s) and H,SO,(aq). Write out this bal anced equation. 2. Zinc also reacts with HCI(aq). Write out this balanced equation. 3. If the E recovered is a number larger tan 100%, what accounts for the extra mass of copper in the measurement?

Answer:

125

Explanation:

use the formula e=1/2mv² and use m=10 and v=5

this produces the equation e=1/2x10x25=125

dont forget the units (J) ;)

Answer:

125J

Explanation:

K.e=1/2mv^2

=1/2(10)(5)^2

=125J

Answer:  5 years

Explanation:

Expression for rate law for first order kinetics is given by:

\(t=\frac{2.303}{k}\log\frac{a}{a-x}\)

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant  = x

a - x = amount left after decay process  = \(\frac{x}{16}\)

a) for calculating k

\(20=\frac{2.303}{k}\log\frac{x}{\frac{x}{16}}\)

\(k=\frac{2.303}{20}\log{16}\)

\(k=0.138years^{-1}\)

b) for calculating half life:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

\(t_{\frac{1}{2}}=\frac{0.693}{0.138years^{-1}}\)

\(t_{\frac{1}{2}}=5years\)

Thus its half life is 5 years

Answer:

The orbital speeds of stars far from the galactic center are surprisingly high, suggesting that these stars are feeling gravitational effects from unseen matter in the halo.

Answer:

54,000

Explanation:

The effective spring constant can be expressed in terms of k1 and k2 as:

k = k1k2 / (k1 + k2).

The effective spring constant k of the two-spring system can be expressed in terms of k1 and k2.

There are two cases for springs connected in series.

They are given as follows:

Case 1: Two springs have the same spring constant, k1 = k2 = k

In this case, the springs are identical and have the same spring constant k.

The effective spring constant for two springs connected in series can be calculated as:

k = k1 + k2 = k + k = 2k

Therefore, the effective spring constant is 2k

Case 2:

Two springs have different spring constants, k1 ≠ k2In this case, the springs have different spring constants k1 and k2.

The effective spring constant for two springs connected in series can be calculated as follows:

1/k = 1/k1 + 1/k2k = k1k2 / (k1 + k2)

Therefore, the effective spring constant can be expressed in terms of k1 and k2 as:

k = k1k2 / (k1 + k2).

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A. Total momentum in a closed system is conserved

the law of momentum conservation states that The total amount of momentum before the collision is the same as the total momentum after the collision. Regardless of the change of momentum of each object.

The centripetal force acting on the hammer is approximately 203.78 Newtons.

To find the centripetal force acting on the hammer, we can use the equation F = (m * v²) / r, where F is the centripetal force, m is the mass of the object, v is the linear velocity, and r is the radius of the circular motion.

Given:

Mass of the hammer (m) = 6 kg

Radius of the circular motion (r) = 1.25 m

Time for one revolution (T) = 1.2 s

To find the linear velocity (v), we can use the equation v = 2πr / T, where π is approximately 3.14159:

v = (2π * 1.25 m) / 1.2 s ≈ 6.54 m/s

Now we can calculate the centripetal force:

F = (m * v²) / r

 = (6 kg * (6.54 m/s)²) / 1.25 m

 = 203.78 N

Therefore, the centripetal force acting on the hammer is approximately 203.78 Newtons. This force is directed towards the center of the circular motion and keeps the hammer moving in a circular path.

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The moon remains in orbit around earth because of gravitational energy

Data;

Moon and other centripetal bodies maintain a state of constant orbit or centripetal acceleration because of gravitational energy.

The gravitational energy acting on the moon keeps the body rotating. This is further elaborated by Einstein's theory of relativity.

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A system is at rest. The mass of each object is shown. Neglecting the mass of the strings, the number of forces that are acting on the 6 kg block is option B. There are 2 forces

The system is at rest, so the forces acting on the 6 kg block must be balanced. Since the only forces acting on the block are the tensions in the strings, there must be two forces acting on the block. The correct answer is B. There are 2 forces.

Therefore, the mass of each object is shown. Neglecting the mass of the strings, the number of forces that are acting on the 6 kg block is option B. There are 2 forces.

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Answer:

The Independent Variable is the recorded fingerprint pattern.

The Dependent Variable is the shape of the fingerprint pattern.

The Control Group does not receive the Variable that you are testing

Explanation:

Answer:

1 since it is meatl and sharp

2 since it is sharp and iron

Answer:

From the graph, at t = 5 seconds, the velocity = 50 m/s as shown also in the above table

Please find attached the graph

Explanation:

The initial velocity of the body =  m/s

The acceleration of the body = 8 m/s²

The velocity after 5 seconds can be determined graphically and by calculation as follows;

Graphically, we have the data points which can be found by the straight line relation  v = u + a×t,

Where ,

a = The slope = 8 m/s²

u = 10 m/s = The y-intercept

Which gives;

v = 10 + 8 × t

The following data can be calculated for various time t;

Time, t     Velocity , v

0,             10

1,              18

2,             26

3,             34

4,             42

5,             50

6,             58

From the graph, at t = 5 seconds, the velocity = 50 m/s as shown also in the above table

Please find attached the graph

By calculation, we have;

v = u + a×t

Where;

v = The final velocity

u = The initial velocity = 10 m/s

a = The acceleration = 8 m/s²

t = The time = 5 seconds

v = 10 + 5× 8 = 50 m/s.

Answer:

Unit conversion is very important because the rest of the world other than three countries uses the metric system. So, converting units is important in science because it uses the metric system. The metric system is measurements like cm, m, l, mL, etc...

Explanation:

Units can: Help to show another person the exact amount you have. Assist in solving a mathematical problem, especially in chemistry, where you can follow the units to get to the answer. Show which measurement system the person is using (i.e. metric or standard)

Hope this helps :)

Answer:

12 seconds in the air

2.5

very high

132

Explanation:

In a study of over 10,000 mothers in western and Asian nations, consistently engaging in bedtime routines was associated with better sleep quality and longer sleep duration (waking less often).

A bedtime routine is a set of activities or habits that a person does before going to sleep. This can include things like brushing your teeth, taking a shower, reading a book, or doing some light stretching. The purpose of a bedtime routine is to help the body and mind relax and prepare for sleep.

Bedtime routines provide a sense of structure and predictability, which can help individuals relax and fall asleep more easily. Additionally, consistent bedtime routines can help regulate the body's internal clock, leading to improved sleep quality and longer sleep duration.

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Inductance is a fundamental concept in physics and electrical engineering that describes the ability of a component or circuit to store and release energy in the form of a magnetic field. The energy that is stored in an inductor with inductance 17.0 uH and current 2.2 A, Inductance, L = 17.0 µH = 17.0 × 10⁻⁶ H.

The formula to calculate energy, E stored in an inductor is given as; E = (L × I²) / 2, Where, E is the energy stored in inductance L, in Joules, I is the current flowing through the inductor, in Ampere, L is the inductance of the inductor, in Henrys.

Substituting the values of current and inductance in the above equation, we get; E = (17.0 × 10⁻⁶ × 2.2²) / 2E = (17.0 × 10⁻⁶ × 4.84) / 2E = 41.08 × 10⁻⁶ JE = 4.108 × 10⁻⁵ J (rounded to four significant figures).

Therefore, the energy stored in an inductor with inductance 17.0 µH and current 2.2 A is 4.108 × 10⁻⁵ J.

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Answer:

True

Explanation:

Incandescence material are those which glow on being heated above a particular point.  For example an incandescence bulb which has a filament. when the filament is heated it starts to glow.

The least energy efficient type of electronic lights typically used in residential buildings are usually called incandescent lamps. Although ineffective, incandescent lamps provide a variety of important advantages, they are inexpensive to purchase, turn on instantly and are available in a wide range of sizes and shapes.

Explanation:

Because the temperature and the radiation are not correlated, they're not represented as functions of each other, they're represented as independent variables thus using graph 5 you cannot figure out how one affect another

Answer:

It doesn’t show how temperature and radiation relate to each other. It’s difficult to draw conclusions from data that’s separated this way.

Frequencies would show resonance will be 30 Hz,45 Hz and 60 Hz. Option B and E are correct.

Mechanical systems and charged particles all have a frequency that they vibrate at. this frequency is referred to as the resonance frequency or natural frequency.

When the matching vibrations of another item enhance the amplitude of an object's oscillations, this is known as resonance.

15 Hz is the fundamental frequency of the string.

Higher frequencies, such as the first overtone, second overtone, third overtone, and so on, must be used to cause the string to vibrate in a resonant manner.

F₁ = 2F₀ = 2 x 15 = 30 Hz is the initial overtone.

F₂ = 3F₀ = 3 x 15 = 45 Hz is the second overtone.

F₃ = 4F₀ = 4 × 15 = 60 Hz is the third overtone.

Hence,frequencies would show resonance will be 30 Hz,45 Hz and 60 Hz. Option B and E are correct.

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More nations have gravitated toward the  model because it offers several advantages and has proven to be a successful approach in promoting economic growth and development.

Efficiency: The market-based model, characterized by free markets and competition, allows for efficient allocation of resources. It enables individuals and businesses to make decisions based on market forces, such as supply and demand, which leads to the optimal allocation of goods and services. This efficiency promotes productivity and economic growth.

Innovation and Entrepreneurship: The market-based model encourages innovation and entrepreneurship. In a competitive market, businesses are incentivized to develop new products and services to meet consumer demands. This drive for innovation fosters technological advancements, job creation, and economic dynamism.

Individual Freedom: Market-based economies prioritize individual freedom and choice. Individuals have the freedom to make decisions regarding their consumption, production, and employment. This freedom allows for personal initiative, economic mobility, and the pursuit of individual aspirations.

International Trade: Market-based economies promote international trade and globalization. By opening up to international markets, countries can benefit from the exchange of goods, services, and ideas, leading to increased economic opportunities and access to a wider range of resources.

Economic Stability: Market-based economies tend to be more resilient and adaptable to changing circumstances. The decentralized nature of markets allows for self-correction mechanisms, such as price adjustments, in response to economic shocks.

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Nations have gravitated toward the market-based model because it promotes economic growth and efficiency, encourages innovation and investment, and allows for flexibility and adaptation to global trends and demands.

More nations have gravitated toward the market-based model because it has been proven to promote economic growth and increase efficiency. The market-based model is based on the principles of supply and demand, competition, and individual choice. When countries adopt this model, it can lead to innovation, entrepreneurship, and investment, which can stimulate economic growth.

For example, countries like the United States and Germany have embraced the market-based model and have experienced significant economic development. They have seen increased productivity, job creation, and technological advancements. Additionally, the market-based model allows for flexibility and adaptation to changing global trends and demands. It encourages free trade and cooperation between nations, fostering a global economy.

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Answer:

La materia es la sustancia de la que está hecho todo material. En física, el sistema es una de las propiedades de la materia. Se puede transferir entre objetos y convertir en forma. No se puede crear ni destruir.

espero que te ayude!

Answer:

transmission

Explanation:

Explanation:

1 km/hr × (1000 m/km) × (1 hr / 3600 s) × 45 s = 12.5 m

"The potential energy at top of a hill will be higher than kinetic energy at the bottom"- the statement is partially true or false

This is in the context that potential energy increases with height while the kinetic energy increases with increase in velocity. When the ball is at top of hill due to greater height and minimal velocity the potential energy is higher at top and while going the hill velocity will increase and hence the kinetic energy. However comparing the both speeds is not a valid thing to do as these energies flow in accordance to law of conservation of energy. But assuming that at highest point the velocity becomes zero the kinetic energy becomes null and at lowest point the potential energy is zero we may conclude that potential energy at highest point is equal to the kinetic energy at the lowest point in atleast some cases.  

The economic boom that followed World War II contributed to a blurring of the lines between the middle class and the working class through several key factors.

Firstly, the post-war economic prosperity led to increased job opportunities and higher wages for many workers. This resulted in an upward mobility for some working-class individuals, as they were able to attain higher-paying jobs and improve their standard of living. This upward mobility allowed them to enter the middle-class bracket.

Secondly, the expansion of the manufacturing and service sectors created a demand for a skilled workforce. This led to the growth of white-collar jobs that required specialized knowledge and education. As working-class individuals acquired the necessary skills and qualifications, they were able to secure these higher-paying white-collar positions, blurring the traditional boundaries between the middle class and the working class.

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Answer:

196 J

Explanation:

Formula

Here, we are given :

Solving

Eating broccoli absorbs chemical energy that your body converts to energy that your body needs, such as energy for movement , temperature control and other life processes.

 This refers to a green plant that is edible. It is in the cabbage famil. It has a large flowering head, stalk, and small associated leaves that are eaten as a vegetable. Broccoli is classified in the Italica cultivar group of the species Brassica oleracea.

Broccoli is a nutrient-rich vegetable that may enhance your health in a variety of ways, such as by reducing inflammation, improving blood sugar control, boosting immunity, and promoting heart health.

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