The asnwer to your question is A
The plates push apart from eachother
Answer:
velocity of the metal cylinder = 0.343 m/s
Explanation:
Force putting the metal cylinder is given by
F = mv²/r
But this force will balance the frictional force between the metal cylinder and the turntable
The frictional force is given by
μN = μ × mg = 0.08 × 0.2 × 9.81 = 0.15696 N
r = 0.15 m, m = 0.2 kg,
F = mv²/r = 0.2 v²/(0.15) = 1.3333 v²
1.3333 v² = 0.15696
v² = 0.117
v = 0.343 m/s
serving speed = 170 km/h
now we will convert it into m/s
now it will have two components along x and y directions
also in x and y directions we know
by solving above equation we have
so angle is 6.11 degree below the horizontal
now we have
now time taken by ball to reach the ground will be
now the displacement in x direction will be
now the distance from net will be
So it will land inside the line
When the distance is decreasing, the frequency of the received wave form will be higher than the source wave form. the sound changes because, the sound waves and their frequency changes as they pass by you as they are moving in the same direction. HOPE THIS HELPED YOU :)