a 54 newton horizontal force pushes a 5.0 kg mass sitting on a horizontal surface. Additionally , the horizontal surface exerts a 30 newton frictional force on the mass. What is the acceleration of the mass?
Heat flows through a wooden board 30mm thick at 0.0086 W/cm² when one of it's sides is 20°C warmer than the other. Determine the thermal conductivity of the wood.
What quantity is carried by sound waves from their source to the point where they eventually get absorbed?