The viscosity n of a liquid can be calculated using equation: n=bpt, where b is calibration constant of the viscometer, pis the density of the liquid and t is time of flow through the viscometer. in one experiment, water was used to calibrate the viscometer at 25.0°c, and the time of flow was measured as 200.3+0.2 s. at 25.0°c, the density and viscosity of water are 0.99708 g. mland 8.909 x 10-g. cms, respectively. using the same viscometer, the time of flow was 425.6+0.5 s at 25.0°c for an unknown liquid with density 0.85667 g. ml. determine constant b and the viscosity of the unknown liquid with error analysis.

see earlier answer

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

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.