Class 9 Chapter 11 Work And Energy Part 5 Commercial Unit Of Energy Topics and sub topics in class 9 science chapter 11 work power and energy: these solutions are part of ncert solutions for class 9 science. here we have given class 9 ncert science textbook solutions for chapter 11 work power and energy. q1: a force of 7 n acts on an object. the displacement is, say 8 m, in the direction of the force. Key features of ncert solutions for class 9 science chapter 11: work and energy. provides detailed explanations for all complex topics. provides completely solved solutions to all the questions in the class 9 science ncert textbooks. these solutions include important questions at the end of every chapter.
Ncert Solutions For Class 9 Science Chapter 11 Work And Energy Possesses energy can do work. the energy possessed by an object is thus measured in terms of its capacity of doing work. the unit of energy is, therefore, the same as that of work, that is, joule (j). 1 j is the energy required to do 1 joule of work. sometimes a larger unit of energy called kilo joule (kj) is used. 1 kj equals 1000 j. 11.2. Write an expression for the kinetic energy of an object. answer. if a body of mass mis moving with a velocity v, then its kinetic energy e k is given by the expression, e k = 1 2 mv2. its si unit is joule (j). 3. the kinetic energy of an object of mass, m moving with a velocity of 5 m s−1 is 25 j. Answer: battery converts chemical energy into electrical energy. this electrical energy is further converted into light and heat energy. question 4: certain force acting on a 20 kg mass changes its velocity from 5 m s –1 to 2 m s –1. calculate the work done by the force. answer: mass of the body = 20 kg. Answer: the energy possessed by an object by virtue of its motion is known as the kinetic energy of the object. question 7. write an expression for the kinetic energy of an object. answer: k.e. of an object = 1 2 mv 2 , where m is the mass of the object and v is the speed of the object. question 8.
Commercial Unit Of Energy Class 9th Chapter 11 Work And Energy Answer: battery converts chemical energy into electrical energy. this electrical energy is further converted into light and heat energy. question 4: certain force acting on a 20 kg mass changes its velocity from 5 m s –1 to 2 m s –1. calculate the work done by the force. answer: mass of the body = 20 kg. Answer: the energy possessed by an object by virtue of its motion is known as the kinetic energy of the object. question 7. write an expression for the kinetic energy of an object. answer: k.e. of an object = 1 2 mv 2 , where m is the mass of the object and v is the speed of the object. question 8. Chapter 11 work and energy ncert solutions class 9 science. class ix science. chapter 11 – work and energy. question 1: a force of 7 n acts on an object. the displacement is, say 8 m, in the direction of the force (fig. 11.3). let us take it that the force acts on the object through the displacement. Cbse class 9 science notes chapter 11 work, power and energy. facts that matter. work: when a force acts on an object and the object shows displacement, the force has done work on the object. work = force x displacement unit of workdone = joule = newton x metre 1 joule work is said to be done when 1 newton force is applied on an object and it.
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