To tune middle C on a piano, a tuner hits the key and at the same time sounds a 261 HzHz tuning fork. Part A If the tuner hears 3 beats per second, what are the possible frequencies of the piano key

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards

helium

oxygen

neon

sodium

the correct answer is "inertia"