This problem can be solved by using the Archimedes Principle. The principle basically lets us derive a force balance between the weight of the log and the buoyant force exerted by the water, that is
weight of log = buoyant force exerted by water
simplification of the derviation would yield,
Dl/Dw = fraction of the of the log submerged in water = (1-0.25) = 0.75
where Dl = density of the log
Dw = density of the water (1000 kg/m3)
therefore Dl = 750 kg/m^3
Hope this helps
Answer:
(C) T
The tension T at equilibrium will be equal to the Buoyant force.
The Buoyant force is given by:
Fb = density x acceleration due to gravity x volume displaced
The change in height doesn't affect the Buoyant force and hence the tension.
Note: The figure of question is added in the attachment
Answer:
Acceleration = Δv/t
Acceleration = (8 m/s - 0 m/s)/ 3 s
Acceleration = 8 m/s / 3s
Acceleration = 2.667 m/s²
Explanation:
Answer:
10.6 Years
Explanation:
The Sun is a very volatile body. It shows a lot of features like solar flares, sun spots, prominence etc. These features are result of the magnetic field and differential rotation of the Sun. The regarding the no. of sun spots visible, solar flares, intensity of flares etc. have been collected for years and it can be seen that these activities follow a cycle with maxima and minima.
This cycle is of 10.6 years. The change in the solar activity also affects some terrestrial phenomenon such as Aurora.
Answer:
A. Millimeters
Explanation:
C. is a unit of weight-wrong
D. is a unit of volume-wrong
B .kilometers are too large