The area of tibet is 1,230,000 km^2 . the average annual insolation (hours of equivalent full sunlight on a horizontal surface) is 3000 h. if one-half the area of tibet is covered with solar panels of 10% efficiency, how much electricity per year can be generated? what percentage of the world’s energy needs can be satisfied? (the total energy consumption of the world in 2007 was 500 ej.)

gas and liquid

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.