Ncert physics class 11
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If the upper half of a spherical shell is cut out as shown in the given figure , then the net gravitational force acting on a particle located at centre O will be in the downward direction. Since gravitational intensity at a point is defined as the gravitational force per unit mass at that point, it will also act in the downward direction. The students can use these solutions as guidelines to understand the concepts, the fundamental of these chapters and their applications for better board exam preparation. Moment of a force, torque, angular momentum, laws of conservation of angular momentum and its applications. There are also equal attractive forces pulling the molecule up and down, and in and out. M and its equation; phase; oscillations of a loaded springrestoring force and force constant; energy in S. Most solids are composed of a very large number of atoms or molecules arranged in a fixed pattern called the lattice structure of a solid and shown schematically in figure 1.

Students often find it the concepts difficult to understand and relate to. The electrical force between the molecules is attractive and tends to pull the molecules together. Equilibrium of rigid bodies, rigid body rotation and equations of rotational motion, comparison of linear and rotational motions. Scattering of light - blue colour of sky and reddish apprearance of the sun at sunrise and sunset. Second law of thermodynamics: reversible and irreversible processes, Heat engine and refrigerator.

Type of Question Mark per Question Total No. Total energy of the spaceship The negative sign indicates that the system is in bound state. This indicates that gravitational forces acting at a point in a spherical shell are symmetric. Simplicity of Physics — Physics is a basic Science. The animate and ananimate — all objects are made up of matter and energy.

The radius of each star is 104 km. Chapter tests and assignments will be uploaded time to time. Due to these reasons physics has intimate relationship with all the sciences and hence it is called a fundamental science. It also explains the behaviours of systems containing very large number of particles. Physics is considered to be a complex subject. Fig 3 The magnitude of this force Ft times the height h of the cube would normally cause a torque to act on the cube to rotate it.

Dimensions of physical quantities, dimensional analysis and its applications. At infinity, the gravitational potential energy of the satellite is zero. Scattering of light — blue colour of sky and reddish apprearance of the sun at sunrise and sunset. Kinetic interpretation of temperature; rms speed of gas molecules; degrees of freedom, law of equi-partition of energy statement only and application to specific heat capacities of gases; concept of mean free path, Avogadro's number. Surface energy and surface tension, angle of contact, excess of pressure across a curved surface, application of surface tension ideas to drops, bubbles and capillary rise. Gravitational potential energy and gravitational potential, escape velocity, orbital velocity of a satellite, Geo-stationary satellites. This will train them to understand what to write and how to write in the Board exam and thus score more marks.

If the space station orbiting around the earth has a large size, can he hope to detect gravity? Therefore, orientational problem can affect an astronaut in space. Most people are familiar with the stretching of a rubber band. Viscosity, Stokes' law, terminal velocity, streamline and turbulent flow, critical velocity, Bernoulli's theorem and its applications. What is the speed with which they collide? Kinetic and potential energies; simple pendulum derivation of expression for its time period. Dynamics of uniform circular motion: Centripetal force, examples of circular motion vehicle on a level circular road, vehicle on a banked road. When the applied force is removed, the attractive molecular forces pull all the molecules back to their original positions, and the material returns to its original length. When the force is removed the body returns to its original size and shape.

Heat transfer-conduction, convection and radiation, thermal conductivity, qualitative ideas of Blackbody radiation, Wein's displacement Law, Stefan's law, Green house effect. The tangential force thus causes a change in the shape of the body that is measured by the angle φ, called the angle of shear. Therefore, any type of study of an object is basically the study of some manifestation of matter and energy. Law of conservation of linear momentum and its applications. Hence, the gravitational potential gradient is zero everywhere inside the spherical shell. Kinetic theory of gases — assumptions, concept of pressure. Therefore, it need not be surprising if some direct modification of the laws of physics appear to be underlying the human behaviour also.

Dimensions of physical quantities, dimensional analysis and its applications. Elementary concepts of differentiation and integration for describing motion, uniform and nonuniform motion, average speed and instantaneous velocity, uniformly accelerated motion, velocity - time and position-time graphs. Equilibrium of concurrent forces, Static and kinetic friction, laws of friction, rolling friction, lubrication. Notion of potential energy, potential energy of a spring, conservative forces: conservation of mechanical energy kinetic and potential energies ; non-conservative forces: motion in a vertical circle; elastic and inelastic collisions in one and two dimensions. It aims to help students understand the course material comprehensively and solve problems that are simplistic, multi-dimensional or complex. So, in physics we deal with nature and natural phenomena. Will an object placed on its equator remain stuck to its surface due to gravity? This symptom can affect an astronaut in space.

If we try to pull one side of a solid material to the right, let us say, then we are in effect pulling all these molecules slightly away from their equilibrium position. Equilibrium of rigid bodies, rigid body rotation and equations of rotational motion, comparison of linear and rotational motions. The improvement of the website and its contents are based on your suggestion and feedback. The textbooks provide a detailed explanation of the concepts with exercise questions provided at the end of each topic. Answer: Answer: iii Gravitational potential V is constant at all points in a spherical shell.