Answer:
MATERIAL MEDIUM
Explanation:
Wave is a disturbance that travels through a medium and transfer energy from one point to another without causing any permanent displacement of the medium itself. The two forms of wave are the mechanical wave and the electromagnetic waves.
Mechanical wave is a wave with requires MATERIAL MEDIUM for its propagation. This means that before wave can be propagated at times, material medium is needed e.g a ripple tank. A ripple tank is a mechanical device that generates waves using an instrument called stroboscope attached to it. This kind of wave requires an external source before it can propagate compared to electromagnetic waves that does not require material medium for its propagation.
a hypothesis is given to explain a phenomena which has not been explained earlier.
it can proved by an experiment if that experiment gets the other results regarding that particular phenomena in agreement with that being predicted by the hypothesis and if result doesnt match the prediction then the hypothesis is again totally discarded at times.
D) Yes. Even though the initial and final velocities are the same, there is a change in direction for the ball.
Acceleration (a) = change in velocity (v) over time (t), let's consider moving right is (+) and moving left is (-)
a = (vf - vi)/t = (-5 - +5)/t
a = (-10)/t
So even though the number looks the same from vi to vf, there actually is a negative acceleration of 10m/s/s.
<span>If the pitch of a sound increases, then we know that its frequency
has increased, and its wavelength has decreased.</span>
Answer:10.961 N
Explanation:
Given
mass flow rate in bucket is 
mass of bucket 
velocity of sand 
Force acting on bucket due to incoming of sand is given by
Now weight of sand and bucket when 0.55 kg sand is Present in bucket
Total reading on scale will be addition of weight and force acting by incoming sand
