Un fir, de sectiune S = 5 mm patrati si lungime L0= 32 cm, este intins de o forta. Stiind ca E = 3 * 10 la put 7 N/m patrat, sa se calculeze constanta elastica k a firului.
Answers
F=S*E*delta l/l0
Fe=k*delta l
F=Fe=>S*E*delta l/l0=k*delta l
#Cuplacerecolegu =)))
The elastic constant of the wire is about 470 N/m
[tex]\texttt{ }[/tex]
Further explanationLet's recall Elastic Constant formula as follows:
[tex]\boxed{k = \frac{E A}{L}}[/tex]
where:
k = elastic constant ( N/m )
E = Young's Modulus ( Pa )
A = cross-sectional area ( m² )
L = initial length ( m )
Let us now tackle the problem!
[tex]\texttt{ }[/tex]
Translation:
A wire, with cross sectional area A = 5 mm² and length L = 32 cm, is stretched by a force. Assuming that Young's modulus of wire E = 3 × 10⁷ N/m², calculate the elastic constant k of the wire !
Given:
cross sectional area = A = 5 mm² = 5 × 10⁻⁶ m²
length of wire = L = 32 cm = 0.32 m
Young's modulus of wire = E = 3 × 10⁷ N/m²
Asked:
elastic constant of wire = k = ?
Solution:
[tex]k = \frac{E A}{L}[/tex]
[tex]k = \frac{ (3 \times 10^7) \times (5 \times 10^{-6})}{0.32}[/tex]
[tex]k = 468.75 \texttt{ N/m}[/tex]
[tex]k \approx 470 \texttt{ N/m}[/tex]
[tex]\texttt{ }[/tex]
Learn moreKinetic Energy : https://brainly.com/question/692781Acceleration : https://brainly.com/question/2283922The Speed of Car : https://brainly.com/question/568302Young Modulus : https://brainly.com/question/9202964Simple Harmonic Motion : https://brainly.com/question/12069840[tex]\texttt{ }[/tex]
Answer detailsGrade: High School
Subject: Physics
Chapter: Elasticity
Related Questions
If we have less power, we most likely have
the same amount of work being done over a shorter period of time.
more work done over a shorter period of time.
more work done over the same amount of time.
the same amount of work being done over a longer period of time.
Answers
Power is the rate of work done. Less the power is less will be the work done or longer be the time period. Hence, same amount of work being done over a longer period of time.
What is power ?Power is a physical quantity that describes the work done per unit time. Thus, power is the rate of work done. Work done on a body is equivalent to the energy of the body. Thus power is rate of energy too.
If a force applied on a body results in displacement, it is said to be work done on the body. The ratio of work done to the time is the power of the object.
P = w/t
Therefore, as the work done increases power increases. The more work done within short time, more will be the power. If the same amount of work being done over a long period of time, the object is having less power.
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Final answer:
Having less power implies performing the same amount of work over a longer period of time, as power is the rate of work done over time.
Explanation:
When discussing the relationship between work, power, and time, power is defined as the rate at which work is done or the amount of work per unit time. If we consider two scenarios where the same amount of work is done, the one with less power will require a longer period of time to complete the work. Therefore, having less power most likely means there is the same amount of work being done over a longer period of time.
The discovery of what element showed the usefulness of Mendeleev’s periodic table?
A: Gallium
B: Aluminum
C: Scandium
D: Germanium
Answers
'cause he predicted it's physical properties before it's discovery! After that, it was proved that Mendeleev's periodic table was useful.
Hope this helps!
A. Gallium
Explanation;Mendeleev arranged the elements in rows in order of increasing mass so that elements with similar properties were in the same column. The discovery of new elements such as gallium demonstrated the usefulness of Mendeleev’s table because the close match between Mendeleev’s predictions and the actual properties of new elements showed how useful his periodic table could be. Mendeleev’s efforts more successful because he provided an organizing principle that worked for all off the known elements.A car travels 20 km west, then 20 km south. what is the magnitude of its displacement?
A) 0 km
B) 20 km
C) 28 km
D) 40 km
Answers
Magnitude = √(20² + 20²)
= 26.28km
Answer:
The magnitude of its displacement of the car is 28 km.
Explanation:
It is given that,
Distance covered by the car due west, [tex]d_1=20\ km[/tex]
Distance covered by the car due south, [tex]d_2=20\ km[/tex]
We need to find the magnitude of its displacement. Let it is given by d. We know that displacement of an object is equivalent to the shortest path traveled. It can be calculated as :
[tex]d=\sqrt{d_1^2+d_2^2}[/tex]
[tex]d=\sqrt{(20)^2+(20)^2}[/tex]
d = 28.28 km
or
d = 28 km
So, the magnitude of its displacement is 20 km. Hence, the correct option is (c).
Consult Multiple-Concept Example 5 in preparation for this problem. The velocity of a diver just before hitting the water is -10.5 m/s, where the minus sign indicates that her motion is directly downward. What is her displacement during the last 1.17 s of the dive?
Answers
so, 1.17 s moves to the other side, so the equation would look like
(- 10.5 m/s) (1.17 s) = - 12.285
hope this helps
Hooke's law. The distance d when a spring is stretched by a hanging objective varies directly as the weight w of the object. If the distance is 38 cm when the weight is 3 kg, what is the distance when the weight is 7 kg? ...?
Answers
According to Hooke's Law, the distance when a spring is stretched by a hanging object varies directly as the weight of the object. We can use this information to find the distance when the weight is 7 kg. We get 84 cm.
Explanation:Hooke's Law states that the distance d when a spring is stretched by a hanging object varies directly as the weight w of the object.
This means that if you double the weight, the distance will also double.
Mathematically, we can express this relationship as d = kw, where k is the constant of variation.
To find the value of k, we can use the given information: when the weight is 3 kg, the distance is 38 cm.
Plugging these values into the equation, we get 38 = 3k.
Solving for k, we divide both sides by 3 to get k = 12.
Now, we can find the distance when the weight is 7 kg by plugging this value into the equation: d = 12 * 7 = 84 cm.
does 17 birds drank from the pond over a course of 2 hours describe qualitative dat
Answers
4786 joules fer transferred to an 89.0 gram sample of a unknown material with an initial temperature of 23.0°C what is the specific heat of the measure in the final temperature is 89.5°C
Answers
Answer:
0.8087 C J/g oC
Explanation:
4786 J = 89.0 g x C x (89.5 C- 23.0 C)
4786 J = 6185.5 gC
0.8087 C J/g oC
0.809 C J/g C (sig figs)
Final answer:
The specific heat of the unknown material, given the provided values, is calculated to be approximately 0.80 J/g°C.
Explanation:
To calculate the specific heat of the unknown material, we use the formula q = mcΔT, where q is the heat absorbed or released (in joules), m is the mass of the substance (in grams), c is the specific heat capacity (in Joules per gram per degree Celsius), and ΔT is the change in temperature (in degrees Celsius).
In this question, q = 4786 joules, m = 89.0 grams, and ΔT (change in temperature) = 89.5°C - 23.0°C = 66.5°C. Plugging in these values, we get 4786 = 89.0 * c * 66.5. Solving for c, we find that c = 4786 / (89.0 * 66.5).
After calculating, the specific heat of the material is found to be approximately 0.80 J/g°C.
Which of the following is an example of a lever?
A. knife
B. screw
C. nutcracker
D. pencil sharpener
Answers
Answer:
C nutcracker
Explanation:
A nutcracker is an example of a lever, which belongs to the second -class levers. It has the fulcrum at one end and the effort at the opposite end with the load i.e the nut at its middle. another example is a wheelbarrow.
Semi-conductors are materials that A) are good conductors. B)allow electron flow and resist neutron flow. c)have insulator and conductor properties. d)allow neutron flow. Semi-conductors are materials that have insulator and conductor properties.
Answers
Answer:
c)have insulator and conductor properties.
Explanation:
Semiconductors, as the name suggest have properties of both insulators and conductors. Until the current/voltage applied to them reaches a particular threshold they work like an insulator. Once the threshold is crossed they behave like a conductor. This property makes them very useful in electronic devices. In fact almost all the electronic equipment in today's age use semiconductors in some way or the other.
To make 100 minus charges neutral you need
Answers
Answer:
100 plus charges
Explanation:
A neutral charge is the one that it's not positive (plus sign) neither negative(minus sign), it is 0. So, if there is a -100 charge, to the total charge be neutral, it's necessary to add a positive charge at the same amount, which would be +100.
Suppose that after a certain time tl, the string has been pulled through a distance l. what is the final rotational speed ωfinal of the wheel?
Answers
Using the principle of conservation of angular momentum, we can calculate the final angular velocity of the wheel. The equation for finding this involves the moment of inertia, initial angular velocity, angular acceleration and time.
Explanation:The final rotational speed of the wheel can be determined through the principles of angular momentum and laws of physics involving rotational motion.
We first find the angular velocity using the equation for conservation of angular momentum, which is given by Linitial = Lfinal where L represents angular momentum. This will involve the moments of inertia and initial angular velocity.
Next, we apply our knowledge of the equation wf = wi + αt, where wf represents the final angular velocity, α stands for angular acceleration and t signifies time. Since the string has been pulled through a certain distance after time 'tl', with t denoting time and 'l' represents the length of string, you can calculate the final angular velocity of the wheel through these variables.
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Final answer:
The final rotational speed (ωfinal) of a wheel after a string is pulled can be found using the conservation of angular momentum, assuming no external torques are present.
Explanation:
The question involves finding the final rotational speed (ωfinal) of a wheel given that a string has been pulled through a distance l after a certain time tl. To answer this, we would need to apply the principles of conservation of angular momentum, assuming there are no external torques acting on the system. The initial angular momentum can be expressed as Linitial = Iinitial ωinitial, and the final angular momentum as Lfinal = Ifinal ωfinal. If the string is wound around the wheel, pulling it would likely change the wheel's moment of inertia. Therefore, to find ωfinal without external torques, we would set Linitial equal to Lfinal and solve for ωfinal.
Which statement describes the relationship of voltage and current?
Voltage is directly proportional to current because I = .
Voltage is inversely proportional to current because I = .
Voltage is directly proportional to current because I = VR.
Voltage is inversely proportional to current because I = VR.
Answers
By definition, of the law of ohm, we have to:
[tex] V = I * R
[/tex]
Where,
V: voltage
I: current
R: resistance
Therefore, we have that the relationship between voltage and current is proportional.
The proportionality constant for this case is the resistance.
For the current we have:
[tex] I = \frac{V}{R}
[/tex]
The proportionality constant for this case is the inverse of the resistance.
Answer:
A statement that describes the relationship of voltage and current is:
Voltage is directly proportional to current because I = V / R
How does electricity flow?
A.) From low potential to high potential
B.) From conductor to insulator
C.) From series circuit to paralell circuit
D.) From high potential to low potential
Answers
So, option D is your answer!
Hope this helps!
you can think of it as water in a pipe , where water flows from a high pressure to low pressure
As an object falls freely toward the earth, the momentum of the object-earth system (1) decreases (2) increases (3) remains the same ...?
Answers
The best and most correct answer among the choices provided by your question is the third choice or number 3.
As an object falls freely toward the earth, the momentum of the object-earth system remains the same.
I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
The momentum of the object-Earth system remains the same as the object falls. The recoil of the Earth is negligible but present, ensuring conservation of momentum within the closed system.
Explanation:As an object falls freely toward the Earth, the momentum of the object-Earth system remains the same. To understand this, we need to consider the laws of conservation of momentum, which state that within a closed system, momentum does not change. When an object, such as a ball, falls and collides with the Earth, there is an equal and opposite change in momentum of the Earth, maintaining the system's total momentum. Although the Earth's recoil is imperceptibly small due to its large mass, it is still present.
For example, if a superball collides with the ground, the change in momentum of the superball will be equal in magnitude and opposite in direction to Earth's change in momentum. This is because, in a closed system, the sum of the forces is zero, leading to no net change in momentum. Similarly, when considering two cars in a collision where friction is negligible, the total momentum before and after the collision remains the same.
In summary, when considering a sufficiently large system, such as an object-and-Earth system, the law of momentum conservation implies that the total momentum remains constant, even if individual components within that system change momentum.
An explosion is an example of _____.
fusion
instant oxidation
detonation
combustion
Answers
An explosion is an example of a detonation.
I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
Answer: detonation
detonation
If the mass of two objects increases, the force of gravity between them
increases
decreases
remains the same
could increase or decrease, depending on the shape of the objects
Answers
What happens to the energy put into a machine that does not get used to do useful work?
A. most gets converted to light energy
B. most gets converted to heat energy
C. most gets converted to sound energy
What happens to the energy put into a machine that does not get used to do useful work?
A. most gets converted to light energy
B. most gets converted to heat energy
C. most gets converted to sound energy
Answers
Answer:
B. most gets converted to heat energy
Explanation:
Let us take the example of a car. Though some formula one cars have 50% efficiency, the efficiency of an internal combustion car varies between 18–20%. Though some formula one cars have 50% efficiency This means that more than 80% of energy is not utilized hence it is wasted. Little energy does get converted to sound. But almost no energy changes to light.
So, most gets converted to heat energy.
A severe storm on January 10, 1992, caused a cargo ship near the Aleutian Islands to spill 29,000 rubber ducks and other bath toys into the ocean. Eight months later, hundreds of rubber ducks began to appear along a shoreline roughly 1800 miles away. What was the approximate average speed (in mi/h and m/s) of the ocean current that carried the ducks to shore? ...?
Answers
Velocity = distance / time
v = 1800/5760 = 0.3125 mi/h
0.3125 mi/h * 1h/3600s * 5280f /mi * 0.3048 m/f = 0.1397 m/s
hope this helps
The average speed of the ocean current that carried the rubber ducks was approximately 0.309 miles per hour (mi/h) or 0.138 meters per second (m/s), calculated by dividing the total distance by the time taken and converting the units accordingly.
Explanation:The question revolves around calculating the average speed of ocean currents based on the distance rubber ducks traveled after being spilled into the ocean. To find the average speed, we divide the total distance by the total time taken. In this case, the ducks traveled approximately 1800 miles over eight months. Since one month averages about 30.44 days, and there are 24 hours in a day, we first convert 8 months into hours:
8 months * 30.44 days/month * 24 hours/day = 5825.92 hours
Now we calculate the average speed in miles per hour (mi/h):
Average Speed = Total Distance / Total Time = 1800 miles / 5825.92 hours = 0.309 mi/h
Next, we'll convert this speed into meters per second (m/s), using the conversion factor where 1 mile = 1609.34 meters.
0.309 mi/h * (1609.34 meters/mile) / (3600 seconds/hour) = 0.138 m/s
Therefore, the approximate average speed of the ocean current was 0.309 mi/h or 0.138 m/s.
What is escape velocity?
Answers
Every planet has their own corresponding escape velocities. Example - Earth has escape velocity of 11.2 Km/s. It means, if you want to leave the Earth's gravitational field then it's the lowest speed which you need to acquire otherwise you wouldn't do that!
Hope this helps!
A wagon is pulled at a speed of 0.40/s by a horse exerting 1,800 newton horizontal force. what is the power of the horse?
power=work x joules
work=force times distance
Answers
Higher energy efficiency is desirable because
Answers
the cost is kept lower. hope it helps :)
In what state must matter exist for fusion reactions to take place?
...?
Answers
a rock dropped from a cliff covers one-third of its total distance to the ground in the last second of its fall. Air resistance is negligible. How high is the cliff?
Answers
h = 0.5gt₁²---------->(1)
Here, t₁ represents the TOTAL time the object takes to fall through h.
Now the distance it falls through from rest until it has 1.00s to fall is:
h - 0.33h = 0.5gt₂²
0.667h = 0.5gt₂²----------->(2)
Now that we know that it takes 1.00s to fall part of h, we can express it as:
t₁ - t₂ = 1.00s
t₂ = t₁ - 1.00s------>(3)
We can eliminate t₂ by subbing (1) and (3) into (2):
0.667(0.5gt₁²) = 0.5g(t₁ - 1.00s)²
0.3335gt₁² = 0.5gt₁² - gt₁+ 0.5g
This is a quadratic equation, in standard form:
0.1665gt₁² - gt₁+ 0.5g = 0
0.1665(-9.80m/s²)t₁² - (-9.80m/s²)t₁+ 0.5(-9.80m/s²) = 0
(-1.6317m/s²)t₁² + (9.80m/s²)t₁- 4.90m/s² = 0
From the quadratic formula:
t₁ = -b ± √[b² - 4ac] / 2a
= -(9.80) ±√[(9.80)² - 4(-1.6317)(-4.90)] / 2(-1.6317)
t₁ = 0.55s or t₁ = 5.456s
Lets plug them both individually into (3) and if one value for t₂is negative, choose the other:
t₂ = t₁ - 1.00s
= 0.55s - 1.00s
= -0.45s
So:
t₂= 5.456s - 1.00s
= 4.46s
The distance fallen is easy, as you only need put the total time t₁ into (1):
h = 0.5gt₁²
= 0.5(9.80m/s²)(4.46s)²
= 97.5m
A half-cup of ice cream contains about 200 food Calories. How much
power can be produced if the energy in a cup of ice cream is expended
over a period of 10 minutes (600 seconds)? Each food Calorie is equal to 4,184 joules. Write your answer in watts and then in horsepower
Answers
The power that can be produced when the energy in a cup of ice cream is expended over a period of 10 minutes is approximately 1,394.67 watts or 1.87 horsepower.
Explanation:To calculate the power that can be produced when the energy in a cup of ice cream is expended over a period of 10 minutes, we need to convert the energy from kilojoules (kJ) to joules (J). Given that each food Calorie is equal to 4,184 joules, a half-cup of ice cream contains about 836,800 joules (200 Calories × 4,184 joules/Calorie).
Next, we need to calculate the power. Power is calculated by dividing the energy by the time. So, the power that can be produced when the energy in a cup of ice cream is expended over a period of 10 minutes (600 seconds) is 1,394.67 watts (836,800 joules ÷ 600 seconds).
To convert the power from watts to horsepower, we need to divide the power by 745.7 (1 horsepower = 745.7 watts). Therefore, the power can be converted to approximately 1.87 horsepower (1,394.67 watts ÷ 745.7).
What is the sequence of energy transformations that occur in a nuclear reactor?
a. nuclear energy- mechanical energy- thermal energy- electrical energy
b. nuclear energy- thermal energy- mechanical energy-electrical energy
c. thermal energy-nuclear energy-mechanical energy-electrical energy
d. electrical energy-thermal energy-mechanical energy-nuclear energy
Answers
Answer:
Option (b)
Explanation:
A nuclear reactor is a set up in which nuclear fission takes place and then the energy released is used to generate electrical energy.
Initially the nuclear energy is released by the fission of Uranium or reactor fuel.
Now, this nuclear energy is used to heat the water, then the energy from the hot water or steam is used to rotate the turbine, finally the turbine rotate and the electrical energy is generated by the generator.
So, the correct sequence is
nuclear energy - thermal energy - mechanical energy - electrical energy
Nuclear energy- thermal energy- mechanical energy-electrical energy.
What is Energy transformation?
The total amount of energy in the universe has never changed and will never change because it cannot be created or destroyed. This does not imply that energy cannot change forms or even move between objects though; it does.
Kinetic energy, or the energy attributed to motion, can be transferred from a moving item to a stationary object by means of effort, which is a frequent example of energy transfer that we experience in everyday life.
A portion of the kinetic energy in the club is transferred to the golf ball when it is struck by a stationary golf ball due to the "work" the club does on the ball.
Therefore, Nuclear energy- thermal energy- mechanical energy-electrical energy.
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In order to determine the power, you must know..
a. current and voltage
b. force and acceleration
c. newtons and joules
d. resistance and amperage
Answers
Answer:
option (a)
Explanation:
The electrical power is defined as the energy per unit time.
The formula foe the power is given by
P = V I = I^2 R = V^2 / R
So, to find the power we must know the values of current and voltage.
Answer:
The answer is <<< A. current and voltage
Explanation:
Will Upvote!!!
All of the following are areas of science EXCEPT
biology, the study of life
chemistry, the study of matter
astrology, the study of horoscopes
astronomy, the study of the universe
Answers
Which of the following statements is true about scientific theories?
A. Scientific theories become scientific laws.
B. Scientific theories are never proven.
C. Scientific theories become hypotheses.
D. Scientific theories summarize patterns found in nature
Answers
Correct answer choice is :
B) Scientific theories are never proven.
Explanation:
A scientific theory is a well-substantiated description of some features of the natural world, based on a body of evidence that has been frequently authenticated through investigation and experimentation. Such fact-supported hypotheses are not conclusions but authentic statements of the actual world. A scientific theory may be changed and eventually discarded if it cannot be done to fit the new conclusions in such conditions, a more precise theory is then needed.
Option (b) is correct. The scientific theories are the explanations that cannot be proven true.
Explanation:
The Scientific theories are basically the explanations given by the scientists based on the different physical appearances in the universe. The Scientific theories are given based on the patterns that have been occurring for years.
The examples of various scientific theories that are given on the Earth are the tectonic plates theory, Electromagnetic theory, theory of relativity etc. These theories are given by the scientists to explain several patterns that occur in nature.
These scientific theories have never been proven to be true but on the other hand there is no critic to question these theories. Therefore, they have been accepted universally until any proven fact denies them.
Therefore, the scientific theories can also be regarded as the explanations that are accepted universally without being proven because there has been no statement that explains against them.
Thus, Option (b) is correct. The scientific theories are the explanations that cannot be proven true.
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Answer Details:
Grade: High School
Subject: Physics
Chapter: Scientific laws and theories
Keywords:
scientific, theories, patterns, nature, explanation, prove, critic, against, tectonic plates, laws, statement.
The rapid increase in water density with depth defines the __________ .
Answers
A 1.0kg object is suspended from a spring with k=16 N/m. The mass is pulled 0.25m downward from its equilibrium position and allowed to oscillate. What is the maximum kinetic energy of the object?
Answers
1/2 kx^2
= 1/2 x 16 x 1/4^2
= 0.5 N
Hope this helps
The maximum kinetic energy of the 1.0 kg object suspended from the spring is 0.5 Joules. This is calculated by finding the initial potential energy of the object when it is pulled 0.25 meters downwards which then gets converted to kinetic at equilibrium position.
Explanation:The student's question relates to the topic of energy in simple harmonic motion, specifically related to the scenario of a mass attached to a spring. The maximum kinetic energy of an oscillating object can be found when the potential energy is at its minimum, which occurs at the equilibrium position. In this case, the maximum kinetic energy is equal to the initial potential energy of the object when it is pulled down.
The initial displacement of the object is 0.25 meters. Therefore, we can find the initial potential energy using the formula U = 0.5 × k × x², where 'U' is the potential energy, 'k' is the spring constant, and 'x' is the displacement. Substituting these values we get U = 0.5 × 16 N/m × (0.25 m)² = 0.5 Joules.
Thus, the maximum kinetic energy of the object is also 0.5 Joules since the entire potential energy at the extreme position will convert into kinetic energy when the object passes through the equilibrium position during its oscillation.
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