Answer:
a.) W/3, b.)2g/3 c.) (4gh/3)^0.5
Explanation:
First we have to find tension in terms of torque. To do that we have to find the moment of inertia of a rigid cylinder. From Wikipedia I get:
We also know the equation for torque. Let T be the tension, r be the distance, I is the moment of inertia and alpha is angular acceleration (ignore theta because it is perpendicular)
We can then substitute a/r for α
Therefore we get:
Isolating T and substitute the moment of inertia in for I we get
There are two known forces acting on the cylinder, gravity and tension. The sum of these two forces gives us mass times acceleration (Newton's second law)
This allows us to plug acceleration back into Newton's Second Law:
w = the weight
For part b, we solved in part a:
For part c, we use the conservation of energy. We know that the sum of energy in the system is zero.
Answer:
The buoyant force is a result of pressure exerted by the fluid. The fluid pushes on all sides of an immersed object, but as pressure increases with depth, the push is stronger on the bottom surface of the object than in the top
Explanation:
Earths tilt making the sun go haywire lol XD
Answer:
Positive sign for negative velocity and minus sing for positive velocity
Explanation:
In the case of the negative velocity, the sign of the acceleration that reduces its magnitude is the positive sign, since being in the opposite direction to the movement indicates a deceleration or braking. In the case of the positive velocity, the sign of the acceleration that reduces its magnitude is the negative sign, since being in the opposite direction to the movement indicates a deceleration or braking. We observe that there will always be a reduction in the magnitude of the velocity if the acceleration goes in the opposite direction.
Answer:
2.45 m
Explanation:
We are given that
Height,h=0.75 m
Initial velocity,
We have to find the height above his own starting point Ed rises.
Initial kinetic energy of Ed=Final potential energy of Ed
According to law of conservation of momentum
Initial kinetic energy of adolf=Final potential energy of adolf
Substitute the values