By calculating the crests, you can find the waves' frequency.
Hope this helps!
The loudness was increased by the amplifier which converted electrical energy into sound energy.
Answer:
thermal energy
Friction does negative work and removes some of the energy the person expends and converts it to thermal energy. The net work equals the sum of the work done by each individual force. The forces acting on the package are gravity, the normal force, the force of friction, and the applied force.
Explanation:
