When the energy of a sound wave is transferred to a particle of a medium and causes it to vibrate and generate heat the sound wave is
A. Reflected
B. Refracted
C. Absorbed
D. Transmitted

Ahole in the ground in the shape of an inverted cone is 14 meters deep and has radius at the top of 11 meters. the cone is filled to the top with sawdust. the density of the sawdust depends upon the depth, x, following the formula ρ ( x ) = 2.5 + 1.2 e − 0.7 x kg/m3. find the total mass of sawdust in the conical hole.