10.7 or round it up to 11
Answer:
∝ = 28.92 rad/s²
Explanation:
Applying third equation of motion to the angular motion, we have:
2∝θ = ωf² - ωi²
where,
∝ = angular acceleration = ?
θ = angular displacement = (27 rev)(2π rad/1 rev) = 169.64 rad/s
ωf = final angular velocity = 99 rad/s
ωi = initial angular velocity = 0 rad/s
Therefore,
(2)∝(169.64 rad) = (99 rad/s)² - (0 rad/s²)
∝ = (9801 rad²/s²)/(38.8 rad)
<u>∝ = 28.92 rad/s²</u>
velocity of object just before hitting the ground = 10 m/s
10 m/sExplanation:
here's the solution : -
=》mechanical energy is always constant, when the object is at the top of the building , the object has potential energy but no kinetic energy,
so, at the top of the building the mechanical energy = potential energy = 100 J
but at when it is dropped from the building, the whole potential energy get converted into kinetic energy, just before reaching the bottom .
so, mechanical energy in the object just before hitting the ground = kinetic energy
( potential energy = 0 )
So, kinetic energy = 100 J
now, we know
=》
( since, mass = 2 kg )
=》
=》
=》
so, velocity of object just before hitting the ground = 10 m/s
We need a system to use those air vibrations to push against the surface of the inner ear fluid.
I believe the answer is D. <span> More sunlight is trapped by the atmosphere to cause global warming.
Even though Atmosphere usually contains Co2, the amount is really minor and heat from the Sunlight usually still able to reflected outside under noermal circumtances. But, due to usage of fossil fuels, the amount of CO2 in the atmosphere is significantly increased and making the sunlight unable to reflected outside and trapped within the Earth.</span>