Which of the following best describes reverberation? A change in the sound wave velocity causes the wave to bend in a different
direction.
The wave fronts become mixed and broken up due to contact with a rough or
irregular surface.
A fraction of the sound waves are absorbed by an object and converted to heat
energy.
A single sound undergoes several reflections due to multiple reflecting surfaces.

choosing tennis and golf balls is your inde choice.

their mass and volume are dep

the answer is a. at the equator

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