Answer:

Explanation:
Given that,
Heat required, Q = 8000 J
Mass, m = 400 g
The change in temperature, 
The heat required due to change in temperature is given by :

So, the specific heat of the substance is 
D. Saturn, Jupiter and Uranus
The Moon always rotates about the Earth in its orbit. The position of the Earth, moon and sun during a new moon is Earth is in between Sun and Moon.
<h3>What is new moon?</h3>
When moon has travelled for 14 days, it starts its journey again for the next 14 days. The journey starts from the new moon to the full moon. The position of new and full moon is the same. At this time, the Earth is in between the Sun and the Moon.
Thus, the position of the Earth, moon and sun during a new moon is Earth is in between Sun and Moon.
Learn more about New Moon.
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Explanation:
Initial speed of blood, u = 0
Final speed of the blood, v = 26 cm/s
(a) Displacement of the blood, d = 2 cm
Let a be its acceleration. It can be calculated using third equation of motion as :



(b) Let t is the time taken by the blood to reach its final speed. It can be calculated as :
<u>
</u>

t = 0.15 s
Hence, this is the required solution.