If energy is neither created nor destroyed then from where do we get energy? -Physics 9th

1 Answer

Answer :

The first law of thermodynamics, also known as Law of Conservation of Energy, states that energy can neither be created nor destroyed; energy can only be transferred or changed from one form to another. For example, turning on a light would seem to produce energy; however, it is electrical energy that is converted.

Related questions

Description : Best Mind Map or Flow Chart of work, energy and power Ch -13 class 9th Physics -Physics 9th

Last Answer : NEED ANSWER

Description : Find the energy possessed by an object of mass 10 kg when it is at a height of 2 m above the ground. Given, g = 10 m/s2 -Physics 9th

Last Answer : Given, Mass of object m=10kg. Height h=6m. Acceleration due to gravity g=9.8m/s2 Potential Energy of object P.E=m×g×h ⇒mgh=10×9.8×6=98×6 =588J Energy possessed by the object is 588Joule.

Description : An electric bulb of 100 W is used for 8 h per day. Calculate the 'units' of energy consumed in one day by the bulb? -Physics 9th

Last Answer : Given : t=6 hrs P=0.06 kW Thus energy consumed per day is: E=Pt=0.06×6=0.36 kWh=0.36 units

Description : If the mass of the body is doubled and velocity is made halved, the kinetic energy will become? -Physics 9th

Last Answer : New kinetic energy becomes, So, the new kinetic energy of the object gets doubled.

Description : An object of mass m and velocity v has kinetic energy= 200J. Find the new kinetic energy if the mass of the object becomes double and velocity still remains the same? -Physics 9th

Last Answer : let the k.e. in first case be x x = 1/2*m*v^2=200j in second case let the kinetic energy be x' v'=v m'=2m x'= 1/2*2m*v^2 x'= 2(1/2*m*v^2) x'=2(x) x'=2*200j x'=400j

Description : An object with 100 N weights is raised to a height of 15m. Find the potential energy possessed by the object at that height. Also find the new potential energy: -Physics 9th

Last Answer : Potential Energy is given by PE=mgHPE=mgH Given mg=100N and H=15 m PE=100 15=1500JPE=100 15=1500J If If the same object is raised half of its original height i.e H= 7.5 m PE=100 7.5=750JPE=100 ... same object is raised to three times of its original height i.e H=45 m PE=100 45=4500JPE=100 45=4500J

Description : How is work and energy related to each other? -Physics 9th

Last Answer : Work results when a force acts upon an object to cause a displacement. The Energy is capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other various forms. ... shares the same units of measure as work. The SI unit of work or energy is the joule.

Description : State and explain one example where kinetic energy is present in a body and is used -Physics 9th

Last Answer : (i) Kinetic energy is the energy present in a body by virtue of its motion. When water is stored in a dam at particular height, we say it has maximum potential energy as the water ... potential energy is stored in the water which transforms into kinetic energy when it released from that height.

Description : Explain the Law of conservation of energy with pendulum. -Physics 9th

Last Answer : Law of conservation of energy state that energy can neither be created nor be destroyed it can only be converted into one form to another form. Now, let us consider a pendulum in which to ... pendulum to overcome the friction is gained by surrounding, So total energy of system will remain conserved.

Description : Derive the formula for potential energy. -Physics 9th

Last Answer : Potential energy is the energy possessed by the body by virtue of its position or configuration. Consider a body of mass m at a height 'h' from the ground. The amount of work done to raise this body to this height h against the force of gravity: W=F×h where F is the force of gravity . W=mgh

Description : A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the kinetic energy of the car -Physics 9th

Last Answer : The kinetic energy becomes 16 time that of initial kinetic energy Final speed = 4 times of initial speed The kinetic energy of car Where, m = mass of car v = initial velocity of car ... of initial velocity, then kinetic energy Hence, The kinetic energy becomes 16 time that of initial kinetic energy

Description : two army person a and b each of weight -Physics 9th

Last Answer : The ratio of powers of A and B = 2: 1 Explanation : Where , Fa = 500N S = 10m Fb = 500N ta = 20s , tb = 40s

Description : two persons a and b each of weight 500 n climb up a rope through a height of 10 m . a takes 20 s while b takes 40 s to achieve this task . what is the ratio of powers of a and b ? -Physics 9th

Last Answer : The ratio of powers of A and B = 2: 1 Explanation : Where , Fa = 500N S = 10m Fb = 500N ta = 20s , tb = 40s

Description : Two army persons A and B each of weight of 500 N climb up a rope through a height of 10 m. A takes 20 s while B takes 40 s to achieve this task. -Physics 9th

Last Answer : The ratio of powers of A and B = 2: 1 Explanation : Where , Fa = 500N S = 10m Fb = 500N ta = 20s , tb = 40s

Description : Two army persons A and B each of weight of 500 N climb up a rope through a height of 10 m. -Physics 9th

Last Answer : Here you go :

Description : can average speed of a moving object be zero -Physics 9th

Last Answer : Answer : No Explaination Speed is the distance travelled in the given time. Distance can never be zero. Therefore, average speed will always be a positive value and will not be zero. Speed is a scalar quantity and has only magnitude.

Description : Obtain a relation for the distance travelled by an object moving with a uniform acceleration in the interval between 4th and 5th seconds -Physics 9th

Last Answer : Uniform acceleration in the interval between 4th and 5th seconds = = (5u + 1/2 * a * 5^2) - (4u + 1/2 * a * 4^2) = 5u + 1/2 *a * 25 - 4u + 1/2 * a * 16 = u + 1/2 * a * (25-16) = u + 1/2 * a * 9 = u + 9/2 * a If it starts from rest then the displacement will be 9/2a. hope this helps!

Description : ncert exemplar class 9th science pdf -Physics 9th

Last Answer : matter in our surroindings Which one of the following sets of phenomena would increase on raising the temperature? (a) Diffusion, evaporation, compression of gases (b) Evaporation, compression of gases, solubility ... Pressure (i) cubic metre (b) Temperature (ii) kilogram (c) Density (iii) pascal

Description : Can non uniform linear motion be accelerated ? -Physics 9th

Last Answer : Yes, the statement is correct. In a uniform linear motion, there is no change in the magnitude or direction i.e., velocity is constant, hence there will be no acceleration. Further, in a ... motion, the direction of motion changes at each point.. Hence, the uniform circular motion is accelerated.

Description : Best Mind Map or Flow Chart of sound Ch -14 class 9th Physics -Physics 9th

Last Answer : NEED ANSWER

Description : Give reason how will the force of attraction between two bodies changes if -Physics 9th

Last Answer : Therefore when the distance between the objects is reduced to half, then the force of gravitation increases by four times the original force.

Description : A force of 10 N displaces a body by a distance of 3 m at an angle 60° to its own direction. Find the amount of work done. -Physics 9th

Last Answer : F=10N,S=2m,θ=600 So, Work=F×Scosθ=10×2cos600 =10×2×21​=10J

Description : An engineer is asked to design a playground slide such that the speed a child reaches at the bottom does not exceed 4.0 m/s. Determine the maximum height that the slide can be.?Given, g = 9.8 m/s2. -Physics 9th

Last Answer : Entire PE is converted to KE when the child reaches bottom So KE = PE 12mv2=mgH12mv2=mgH or H=v22g=162×9.8=.816mH=v22g=162×9.8=.816m

Description : A rocket is moving up with a velocity v. If the velocity of this rocket is suddenly tripled, what will be the ratio of two kinetic energies? -Physics 9th

Last Answer : hope its clear

Description : When the force acts at right angle to the direction of motion, what is the work done by the force -Physics 9th

Last Answer : Let F is the force applied and s is the displacement produce and the angle between force and displacement is θ The work done by this force is given as FW = Fs Cosθ Its unit is joule

Description : Calculate the power of an electric motor that can lift 800 kg of water to store in a tank at a height of 1500cm in 20s -Physics 9th

Last Answer : The power of an electric motor to store the water is 6000 W. Given m= 800 kg, h = 1500 cm = 15 m, g = 10 m/s^2 and t = 20 s. W = 120000 J. P = 6000 W. Thus, the power of an electric motor to store the water is 6000 W.Apr 6, 2016

Description : An electric heater of 1000 W is used for two hours in a day? What is the cost of using it for a month of 28 days, if one unit costs 3.00 rupees? -Physics 9th

Last Answer : energy consumed by heater of 1000W for 2h in one day=1000/1000×2 =2units number of units=W×h×day/1000 energy consumed by heater in 28 day 2×28=56units cost of 1unit =RS 3 cost of 56unit=3×56=RS 168

Description : Certain force acting on a 20 Kg mass changes its velocity from 5 m/s to 2 m/s. Calculate the work done by the force ? -Physics 9th

Last Answer : Certain force acting on 20 kg mass changes its velocity from 5 m s-1 to 2 m s-1. Calculate the work done by the force. (E k)2 = (1 )/2x 20 — (2)2 = 40 J.

Description : Conservation of energy means that (a) energy can be created as well as destroyed (b) energy can be created but not destroyed (c) energy cannot be created but can be destroyed (d) energy can neither be created nor destroyed

Last Answer : Ans:(d)

Description : Conservation of energy means that (a) Energy can be created as well as destroyed (b) Energy can be created but not destroyed (c) Energy cannot be created but can be destroyed (d) Energy can neither be created nor destroyed

Last Answer : Ans:(d)

Description : Which of the following laws validates the statement that matter can neither be created nor destroyed? (1) Law of conservation of energy (2) Le Chatelier's Principle (3) Law of conservation of mass (4) Law of osmosis

Last Answer : (3) Law of conservation of mass Explanation: The law of conservation of mass, also known as the principle of mass/matter conservation, states that the mass of an isolated system (closed to all ... out, its quantity cannot otherwise change over time (hence, its quantity is "conserved" over time).

Description : Energy can neither created nor destroyed. It can only change forms.  a. Conservation of Mass Principle  b. Conservation of Energy Principle  c. Conservation of Momentum Principle  d. Conservation of Heat Principle

Last Answer : Conservation of Energy Principle

Description : The first law of thermodynamics may be expressed in the following equivalent  a. the net heat transfer id equal to the network  b. the sum of the total energy forms leaving the system boundary is ... neither be created nor destroyed but only converted from one form to another  d. all of the above

Last Answer : all of the above

Description : Energy can neither be created nor destroyed but can be converted from one form to other is inferred from  (a) zeroth low of thermodynamic  (b) first law of thermodynamics  (c) second law to thermodynamics  (d) basic law of thermodynamics  (e) claussius statement.

Last Answer : Answer : b

Description : Which of the following laws validates the statement that matter can neither be created nor destroyed ? (1) Law of conservation of energy (2) Le Chatelier’s Principle (3) Law of conservation of mass (4) Law of osmosis

Last Answer : Law of conservation of mass

Description : Who was the first pre-Socratic philosopher to suggest that matter could neither be created nor destroyed?

Last Answer : Answer: Parmenides.

Description : It is important to balance the chemical equations to satisfy the law of conservation of mass. Which of the following statements of the law is incorrect? (a) The total mass of the elements present in ... the reaction (d) Mass can neither be created nor can it be destroyed in a chemical Reaction.

Last Answer : Answer : (c) The chemical composition of the reactants is the same before and after the reaction

Description : It states that mass is a commodity that can neither be heated nor destroyed with the exception of nuclear processes where the conversion of mass into energy is a fundamental principle  a. Law of ... Conservation of Energy  c. Law of Conservation of Power  d. Law of Conservation of Heat

Last Answer : Law of Conservation of Mass

Description : Heat cannot be created, nor destroyed, but it can be changed from one form to another. The energy in the universe remains constant.  a. 1st Law of Energy Conservation  b. 2nd Law of Energy Conservation  c. 3rd Law of Energy Conservation  d. None of the above

Last Answer : 1st Law of Energy Conservation

Description : "Matter can neither be created or destroyed." Who said this, and what, exactly, does it mean?

Last Answer : It’s the second law of thermodynamics. A principle of physics rather than a specific quote.

Description : If a firm, or a network firm, has a direct financial interest in an audit client of the firm, the self-interest threat created would be so significant no safeguard could reduce the threat to an acceptable ... that the remaining interest is no longer material. c. Either a or b d. Neither a nor b

Last Answer : Dispose of the financial interest

Description : Natural draft created by the chimney depends upon (A) Temperature of the flue gas (B) Its height (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

Description : Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan (A) With greater ... (B) Of increased diameter (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) & (B)

Description : Consider the following statements: A. Adam Osborne produced the first portable computer. B. Ian Wilmut created the cloned sheep. Which of the statements given above is (are) correct ? (1) A only (2) B only (3) Both A and B (4) Neither (A) nor (B)

Last Answer : Both A and B

Description : What would change if energy could be created/destroyed?

Last Answer : answer:The thing is, this old style of physical thinking is obsolete. We now know the universe would lose a very basic element of symmetry in order for mass-energy to not be conserved. ... back to the manner of thinking their predecessors used before symmetry and group theory became so fundamental.

Description : The principle that energy may be converted from one form to another but it cannot be either created or destroyed is: w) First Law of Thermodynamics. x) Second Law of Thermodynamics. y) Third Law of Thermodynamics. z) Principle of photoelectricity.

Last Answer : ANSWER: W -- FIRST LAW OF THERMODYNAMICS.

Description : What Matter cannot be created or destroyed in chemical and common physical changes?

Last Answer : Any matter - all mater.

Description : The law of conservation of mass states that in a chemical reaction, matter can be created or destroyed true or false?

Last Answer : the answer for apex if False

Description : True or false The law of conservation of mass states that in a chemical reaction, matter can be created or destroyed?

Last Answer : 1