What did bohr contribute to modern atomic theory
2 answers:
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Answer:
α = 3.27 rad/s²
No
Explanation:
Given that
L= 3 m
Lets take mass of tree = m kg
The torque to mass m = m g .L
The mass moment of inertia of tree ,I
I = mL² kg.m²
We know that
τ = I α
m g .L = mL² .α
α= g/L
Now by putting the value
α = 3.27 rad/s²
No we can find the mass of the from the above information because angular acceleration is not depend on the mass of tree.
Answer:
A. 3.3 m
Explanation:
Here, we have to use conservation of energy principle.
When the ball is at maximum height, the instantaneous velocity at that point is 0 m/s. So, the kinetic energy of the ball is also 0 at the maximum height. Thus, at maximum height, the energy possessed by the ball is gravitational potential energy only.
Now, when the ball reaches the ground, all the gravitational potential energy changes into kinetic energy because of the conservation of energy.
Therefore, the energy transformation can be given as:
Decrease in potential energy = Increase in Kinetic energy
Decrease in potential energy is given as:
Increase in kinetic energy is given as:
Therefore,
Now, plug in 8 for , 9.8 for
and solve for height
. This gives,
Therefore, the maximum height reached by the ball is 3.3 m.