Answer:

Explanation:
From the question we are told that:
Amplitude 
Period 
Wavelength 
Area 
Generally the equation for Power is mathematically given by



Answer: f = 4 Hz i think
Explanation:
sorry i dont rember (cant type lol)
Answer:
7.3 g/cubic cm
Explanation:
You divide the mass by the volume to calculate the density of the metal.
146g ÷ 20cm³ = 7.3g/cm³
Answer:
The material stretched across the drum vibrates to produce the sound waves.
Explanation:
A drum is one of the oldest musical instrument made by man. It is made of a hollow body over which a material such as skin is stretched. When a drum is struck with a stick, the material vibrates up and down. This makes the air above the drum to contract and relax rhythmically resulting in soundwaves. The soundwaves travel through air to reach our ears where they are heard.
The quality of sound produced by a drum is affected by its shape. A larger drum produces a lower pitched sound.
<span>Clear cutting has a similar effect as controlled burning of a forest is True.
True </span>