Name two examples in which the mechanical energy of a system remains constant.

Which is true for Internal energy of system is ?

Draw a diagram to show the energy changes in an oscillating simple pendulum. Indicate in your diagram how the total mechanical energy in it remains constant during the oscillation.

Assertion :- The mechanical energy of earth-moon system remains same when a another heavenly body passes nearby the earth - moon system. Reason :- Force exerted by heavenly body on the earth - moon system is non - conservative.

Show that the heat absorbed at constant volume is equal to the increase in the internal energy of the system, whereas that at constant pressure is equal to the increase in the enthalpy of the system.

Give an example of mechanical energy

In the above problem, find total mechanical energy of the system .

Mechanical energy and kinetic energy

Assertion: Universe as a whole may be viewed an isolted system. Reason: Total energy of an isolated system remain constant or stretched.

STATEMENT -1 : When a planet revolves around Sun in an elliptical orbit, the work done Sun's gravitational force on the planet remains zero for any value of displacement. and STATEMENT -2 : The mechanical energy of Sun planet system remains conserved throughout the motion of planet.