Answer:
Barometer is an instrument used to measure the atmospheric pressure.
Explanation:
- Torricelli did an experiment by filling a one meter long test tube completely with mercury. He took a beaker with some amount of mercury in it and inverted the test tube filled with mercury by closing its open end into the mercury of beaker ensuring that no bubble is trapped into the mercury of test tube during the process.
- This experiment was performed at normal temperature and pressure. Now some of the mercury from the test tube fell down into the beaker through the open end until the level becomes stagnant and this denotes the atmospheric pressure in terms of mercury column.
- There was a vacuum created at the top of the test tube called torricellian vacuum which holds back the remaining mercury height and the rest of the mercury level in the beaker is facing the atmospheric pressure.
We can first obtain time of flight from vertical fall
Initial velocity U=0, d = 6 m, a = 9.8 m/s²
d = ut + 1/2 at²
6.0 = 0 + (1/2 × 9.80 t²)
t = √(12/9.8)
= 1.106 sec
Horizontal velocity = Vh = Dh/t
= 24.0 /1.106 s
= 21.69 m/s
The ball was thrown at a speed of 21.69 m/s
Answer:
Volume charge density: When the charge density is throughout the volume of a body, then the charge per unit volume is called volume charge density and it is represented by ρ.
∴ρ=
Hence the unit of ρ is Cm
−3
Example: If a charge q is uniformly distributed in the whole volume of a
sphere of radius R, then p =
=3q/4πR-3
A peak = A Rms x Sq root 2
Therefore 3.6 x sq root of 2
A peak = 5.09
