One of the most common examples of the Law of Conservation of Energy is: an object falling freely under gravity as shown below Potential energy gets converted into the kinetic energy, potential Energy keeps on decreasing and kinetic energy keeps on increasing This is also in confirmation with the law of conservation of energy Whereas whenever energy changes from one form to another , the total amount of energy remains constant.
The total energy before and after transformation will be the same. During the conversation of energy from one form to another, some energy may be wasted. The force acts on the body along the radius and towards the centre. When the body is at the top of the track, then it will have only potential energy i. Conservation of Energy MCQ Question 5: The total energy of an isolated system: cannot change can only increase can only decrease may increase or decrease depending the nature of the system.
Answer Detailed Solution Below Option 1 : cannot change. The correct answer is option 1 i. It can only be transformed from one form to another.
The total energy of an isolated system always remains constant. An isolated system is a thermodynamic system that cannot transfer or exchange energy or matter between the system and surrounding.
Conservation of Energy MCQ Question 6: The correct sequence of energy transfer that occurs when a bullet is shot upward and then stated falling down at some point because of gravitational force. Answer Detailed Solution Below Option 1 : hydroelectric power point. Explanation: Hydro Power Plant: In hydroelectric power plants, Gravitational potential energy is converted into electrical energy. The electricity produced from the potential energy of water which is further converted into kinetic energy is called hydroelectricity and a plant that generates electricity on a large scale from flowing water is called a hydroelectric power plant.
The requirements for a hydroelectric power plant are a strong , fast flow of water and a significant drop down in which the water can fall. In a hydroelectric power plant, more electrical power can be generated, if waterfalls from a greater height because the rise in water level causes the increase in potential energy of water. Thus, when it flows from a higher position more amount of kinetic energy is formed by the conversion of higher potential energy and this kinetic energy in the form of moving water can produce more electrical power.
So, the correct option is a Hydroelectric power plant. It is used to produce high-speed steam by heating water. The steam is used to rotate the turbine and produce electricity. Wind Mill: A windmill converts the kinetic energy of wind into some usable form of energy. Additional Information. Momentum Equation — It states that the net force acting on a fluid mass is equal to the change in the momentum of flow per unit time in that direction i. It states that the sum of potential energy, kinetic energy and pressure energy per unit mass of a liquid is constant at all sections in an incompressible liquid that has a streamlined flow and does not offer any friction.
The first law of thermodynamics is a restatement of the law of conservation of energy. It states that energy cannot be created or destroyed in an isolated system; energy can only be transferred or changed from one form to another.
When a process is executed by a system, the change in stored energy of the system is numerically equal to the net heat interaction minus the network interaction during the process:. The water is flowing through a pipe having areas 0. The rate of flow through the pipe is 50 litres per second in section 1. The velocity at sections 1 and 2 are:. A channel of width mm branches into two sub-channels having width mm and mm as shown in figure.
If the volumetric flow rate taking unit depth of an incompressible flow through the main channel is 0. Start Learning. Steady flow Irrotational flow Inviscid flow Steady and incompressible flow. Let's discuss the concepts related to Fluid Kinematics and Continuity Equation. Explore more from Fluid Mechanics here. Learn now! Get Started for Free Download App.
Answer Detailed Solution Below Option 4 : 9. Concept: According to continuity, the liquid flow rate will be conserved. Answer Detailed Solution Below Option 3 : 1. Concept: Continuity equation: It is the conservation of mass flow rate.
Fluid is incompressible and flow is irrotational Fluid is incompressible and flow is rotational. Fluid is compressible and flow is irrotational. Fluid is compressible and flow is rotational. Answer Detailed Solution Below Option 2 : 20 sq. Answer Detailed Solution Below Option 2 : m 2. All chemical equations create or destroy matter, which is why scientists weigh their reactants so they can see how much was created or destroyed.
A student mixed grams of sugar, grams of water, and 10 grams of flavoring. The solution weights:. It thickens slightly. What does the solution weigh? A student adds 3 spoons of solid to mL of water. The solution is clear, with nothing on the bottom of the cup. One spoon of the solid has a mass of 5 grams.
What is the mass of the solution? What does the Law of Conservation of Matter refer to? Matter can not be created or destroyed. Matter can be created but not destroyed. Matter can be destroyed but not created.
Matter is being lost everyday. A house made of toy blocks is weighed. It is taken apart and each block weighed separately.
If the weight of all the blocks is added, what will it total? A little less than the weight of the house. It would depend on how large the house was. The same as the house. A little more then the weight of the house.
The total amount of mass in a system does not change during a chemical reaction. Law of Conservation of Mass. Law of Conservation of Volume. No other change occurs. Consistency of matter.
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