Answer:
3947.6 N
Explanation:
Centripetal Force: This is the force that tend to moves a body towards the center of a circle during circular motion.
The formula for centripetal force is
F = mω²r ........................ Equation 1
Where F = Centripetal force, ω = angular velocity, r = radius.
Where π = 3.1415
Given: m = 4 kg, ω = 0.5 rev/s = (0.5×2π) rad/s = 3.1415 rad/s, r = 100 m.
Substitute into equation 1
F = 4(3.1415)²(100)
F = 3947.6 N
Hence the centripetal force on the turbine blade = 3947.6 N
When a light wave with a single frequency strikes an object, a number of things could happen. The light wave could be absorbed by the object, in which case its energy is converted to heat. ... When this occurs, objects have a tendency to selectively absorb, reflect or transmit light certain frequencies.
Answer:
b. The force exerted by the piston on the object is less than F because the piston is accelerating downward.
Explanation:
Given that object exerts a downward force F on the piston that accelerates the piston downward.
An object can accelerate if the net force acting on it is non-zero.
Here, the piston is acceleration in the downward direction, so the net for on the piston is in the downward direction.
Force due to object, F, is in the downward direction while the force exerted by the piston on the object is in the upward direction.
As the acceleration of the piston is in the downward direction, so the downward force is more.
Therefore, the force exerted by the piston on the object is less than F because the piston is accelerating downward.
Hence, option (b) is correct.
As an object falls toward earth, the potential energy of the object : Decreases
Here's the formula for the Potential energy :
E = Em + Ek + Eg
m = mass
= k kinetic
g = gravity
As the potential energy falls toward earth, the Eg became 0, which will decrease its amount