Mercury is used as thermometeric liquid because it is a good conductor of heat colorful, expansion rate is uniform and it doesn't wet the wall of capillary
Answer:


Explanation:
F = Force
s = Displacement = 6.3 cm
m = Mass of bullet = 7.8 g
v = Velocity of bullet = 620 m/s
t = Time taken
Work done is given by

Kinetic energy is given by

Using work energy considerations we get

The average force that stops the bullet is
.
Force is given by

The time taken to stop the bullet is
.
Question seems to be missing. Found it on google:
a) How long is the ski jumper airborne?
b) Where does the ski jumper land on the incline?
a) 4.15 s
We start by noticing that:
- The horizontal motion of the skier is a uniform motion, with constant velocity

and the distance covered along the horizontal direction in a time t is

- The vertical motion of the skier is a uniformly accelerated motion, with initial velocity
and constant acceleration
(where we take the downward direction as positive direction). Therefore, the vertical distance covered in a time t is

The time t at which the skier lands is the time at which the skier reaches the incline, whose slope is
below the horizontal
This happens when:

Substituting and solving for t, we find:

b) 143.6 m
Here we want to find the distance covered along the slope of the incline, so we need to find the horizontal and vertical components of the displacement first:


The distance covered along the slope is just the magnitude of the resultant displacement, so we can use Pythagorean's theorem:

Oxygen has 8 electrons₋₋2 on the inner shell and 6 on the outer shell. Hydrogen has 1 electron on its only shell. (Keep in mind these are not ionized.)