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Direction of Instantaneous Velocity

Fill in the b...

Question

Fill in the blanks.
a) Force = mass $\times$ acceleration, then momentum = ___
b) Liquid hydrogen is for rocket, then for MRI.

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Solution

(a) Momentum = mass x velocity.
Momentum is defined as the product of mass of the body and its velocity.
(b) Liquid helium is for MRI (Magnetic Resonance Imaging). Liquid helium is used to keep the superconducting magnets cool in an MRI machine.

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