A 960-M Wide River Flows at 16 M/s as Shown

question 167

Essay

A 960-m wide river flows at 16 m/s as shown in the figure. Alice and John have a race in
identical boats which each travel 20 m/s in still water. Alice leaves point A and steers so
that she goes straight to point B directly across and then back to A. John leaves point A
and steers up to point C (960 m upstream) and then returns to A.
(a) Which person arrives back at point A first?
(b) How much sooner than the loser does the winner arrive back at point A?

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Definitions:

Parkinson Disease

Parkinson's Disease is a neurodegenerative disorder characterized by motor symptoms such as tremor, rigidity, and bradykinesia, due to the loss of dopamine-producing neurons.

Synapses

Synapses are the junctions through which neurons signal to each other or to non-neuronal cells, allowing for the transmission of electrical or chemical signals across the nervous system.

Calcium

A chemical element essential for life, playing critical roles in cell signaling, muscle contraction, and bone strength.

cGMP

Cyclic guanosine monophosphate, a secondary messenger used in intracellular signal transduction, influencing cellular processes such as muscle relaxation and phototransduction.