Answer:
0.05081 kg
Explanation:
= Mass of blood
= 0.435 m/s
= Mass of subject and pallet = 54 kg
= Velocity of subject and pallet = 
In this system the linear momentum is conserved so,

The mass of blood is 0.05081 kg
The length of the pendulum is 0.087 m. Option d is correct.
<h3>What is Simple harmonic motion?</h3>
Simple harmonic motion is periodic motion caused by a restoring force that is proportionate to the deviation from equilibrium.
Simple harmonic motion is periodic motion but many other conditions are dependent.
The time period of the pendulum is found as;

The length of the pendulum is 0.087 m
Hence, option d is correct.
To learn more about the simple harmonic motion refer to the link;
brainly.com/question/17315536
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<span>Niche - </span><span>An organism's particular role in an ecosystem, or how it makes its living.</span>
The answer is B, the vector represents magnitude and direction
I think that the question is simply asking whether the statement is correct.
The statement is wrong! The scientific endeavor (the work of the scientists, the pursue of knowledge) can be potentially harmful. For example, many tests of human medicine have to be performed on animals, and often the medicine causes great suffering in the animals (and gets rejected for testing on humans).