It IS <span>PE = (1200 kg)(9.8 m/s²)(42 m) = 493,920 J </span>
Answer:
The length of the stick is 0.28 m.
The time the stick take to move is 0.97 ns.
Explanation:
Given that,
Relative speed of stick v= 0.96 c
Speed of light 
Proper length of stick = 1 m
We need to calculate the length of the stick
Using formula of length

Put the value into the formula



We need to calculate the time the stick take to move
Using formula of time

Put the value into the formula



Hence, The length of the stick is 0.28 m.
The time the stick take to move is 0.97 ns.
Answer:
as I know about barometer consist of a mercury .
it can be made with a clean ,dry, thick walled glass tube of about one metre long .
the working mechanism can be given by:
when there is air pressure the mercury in the glass goes against the air pressure to balance itself .
If the weight of mercury is less than atmospheric pressure then the mercury will rise upwards and vice versa.
I think no need to explain the parts u can do it your self as it consist of testube and mercury as main components.if u want the explanation then use search engines to reshearch.
hope this helped you
comment if got any confusion .