Any <em>'</em><em>mechanical</em><em>'</em> wave needs a medium in order to travel from one place to another.
Examples of mechanical waves include . . .
-- ocean waves
-- sound waves
-- Slinky waves
-- guitar-string waves
-- hand waves
-- curtain waves
-- ripples on a pond
-- seismic waves (earthquakes)
Answer:
Black holes are detected as surrounding material (like gas) is funnelled by the force of gravity into a disk around the black hole. The gas molecules in the disk swirl around the black hole so fast that they heat up and emit X-rays. These X-rays can be detected from Earth.
Explanation:
Answer:c
Explanation:
The buoyancy force on toy depends upon the volume of toy under pool water.
According to Archimedes principle buoyant force on a floating body depends upon the weight of displaced liquid by object.
Buoyancy force is given by
where =density of fluid
V=volume of object under water
g=acceleration due to gravity
Answer:
It is a change in velocity over a period of time.
Explanation:
- It is measured in metres/second2<em><u> </u></em><em><u>u</u></em><em><u>s</u></em><em><u>i</u></em><em><u>n</u></em><em><u>g</u></em><em><u> </u></em><em><u>a</u></em><em><u>n</u></em><em><u> </u></em><em><u> </u></em><em><u>accelerometer</u></em><em><u>.</u></em>