Kayaks have been used for thousands of years to hunt and fish in Arctic regions.

The total volume of a particular kayak is

285 litres (which is 0.285 m3). It has a mass of

75 kg. The man using it has a volume of

0.066 m3. When sitting in the kayak, half of

man’s volume is inside the kayak. The density

of the human body is about 1000 kg/m3.

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?