Explanation:
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Answer:
Work done, W = 0 J
Explanation:
Given that,
The total weight of the container, W = 30 N
A container of water is lifted vertically 3 m then returned to its original position. We know that the difference in final and initial position of an object is called its displacement. Here, its displacement is equal to 0 as it reaches to its original position.
Work done is given by :
As d = 0
W = 0
So, no work was done by the container of water. Hence, this is the required solution.
Answer:
20,000 Ns
Explanation:
mass of exhaust gases, m = 50 kg
velocity of exhaust gases, v = 400 m/s
The momentum of a body is defined as the measurement of motion of body. mathematically, it is defined as the product of mass off the body an its velocity.
change in momentum of rocket = final momentum - initial momentum
= m x v - 0
= 50 x 400
= 20,000 Ns