Question

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Answer 1

To answer this question, we can begin by first finding the acceleration (a) of the coin when it stops.  

Magnitude of Initial velocity of the coin (u)= 25 cm/s = 0.25 m/s

Magnitude of final velocity of the coin (v)= 0m/s (since the coin stops)

Time period under consideration (t)= 5 sec

Now, assuming uniform acceleration, using the equation of motion,

v= u + at

Therefore, a= (0-0.25)/5 m/s²= -0.05 m/s²

Now, using Newton's second law,

Net Force (F)= Mass (m) x Acceleration (a)

Note that the net force on the coin in the horizontal direction (along the table surface) is equivalent to the force of friction itself since no other horizontal force acts on the coin, and is given by:

Force of Friction= 0.02 x (-0.05) N = - 0.0010 N  

The negative sign indicates that the friction operates in a direction opposite to the direction of the coin's initial velocity.

Answer 2

Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's activities.

The process of photosynthesis is commonly written as: 6CO2 + 6H2O → C6H12O6 + 6O2. This means that the reactants, six carbon dioxide molecules and six water molecules, are converted by light energy captured by chlorophyll (implied by the arrow) into a sugar molecule and six oxygen molecules, the products.