Answer:
Maximum angle is
rad
Explanation:
As per the question:
length of the pendulum, L = 0.30 m
Radius of the pendulum, R = 0.001 m
Angular speed at the bottom, 
Now,
To calculate the maximum angle,
:
For the pendulum, the moment of inertia, I = 
Now, using the principle of the conservation of energy:
Kinetic energy = Potential energy

where
h = 
Thus



Answer:
<em>The change in momentum of the car is 3575 Kg.m/s</em>
Explanation:
<u>Impulse and Momentum</u>
The impulse (J) experienced by the object equals the change in momentum of the object (Δp).
The formula that represents the above statement is:
J = Δp
The impulse is calculated as
J = F.t
Where F is the applied force and t is the time.
The car hits a wall with a force of F=6500 N and stops in 0.55 s. Thus, the impulse is:
J = 6500 * 0.55
J = 3575 Kg.m/s
The change in momentum of the car is:

The change in momentum of the car is 3575 Kg.m/s
Answer:

Explanation:
The relationship of intensity:

Intensity: 
radius: 
Power is unknown
Now we can apply the formula

Answer:
Nitrogen is used to protect steel from water because nitrogen has low reactivity.
Explanation:
Nitrogen is very low reactive element because it forms a gas when triple bond between two Nitrogen atoms. Due to low reactivity of Nitrogen the water does not react with the nitrogen and steel as well. So, for protection of steel Nitrogen is used.