Answer: 23 hours 56 minutes 4.091 seconds
Explanation: The time it takes Earth to rotate so the sun appears in the same position in the sky, known as a solar day, is 24 hours. However, the time it takes Earth to complete one full rotation on its axis with respect to distant stars is actually 23 hours 56 minutes 4.091 seconds, known as a sidereal day.
Gravity holds everything in the galaxy together.
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Answer:
The tension in the rope is 20 N
Solution:
As per the question:
Mass of the object, M = 2 kg
Density of water, 
Density of the object, 
Acceleration due to gravity, g = 
Now,
From the fig.1:
'N' represents the Bouyant force and T represents tension in the rope.
Suppose, the volume of the block be V:
V =
(1)
Also, we know that Bouyant force is given by:

Using eqn (1):


From the fig.1:
N = Mg + T
40 = 2(10) + T
T = 40 - 20 = 20 N
