The 'trigger' settings determine when the trace begins. suppose you have displayed a sine wave at v = vosin(wt) on the screen, where vo = 3v and w/2t = 5khz. assume further that the signal triggers the scope when v = 1.5v and wt = 30 degrees.
suppose you double th amplitude of the wave without changing any oscilloscope settings. when are v and wt now when the scope is triggered? [ the level hasn't changed so th scope still triggers when v = 1.5v. v = 1.5 = 6sin(wt); wt=sin^-1(1.5/6) = 14.477512851511 degrees]

assume that you reduce vo back to 3v ans switch the trigger slope polarity from '+' to '-' without changing the trigger level dial. what are the v and wt when the scope is triggered now?

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .

the answer is b, have negligible mass

see earlier

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.