Aball of mass 0.05 kg strikes a smooth wall normally four times in 2 second with a velocity of 10m/s. each time the ball rebounds with the same speeds of 10m/s. calculate the average force on the wall

Answer" The average force on the wall be equal to 0.5 N.

Explanation:

To calculate the average force on the wall, we use the following equation:

where,

F = average force = ?N

m = mass of the ball = 0.05kg

= Initial velocity of the ball = -10m/s (negative sign because the ball rebounds)

= Final velocity of the ball = 10m/s

t = time taken by the ball = 2s

Putting values in above equation, we get:

Hence, the average force on the wall will be equal to 0.5N.

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.

bacteria that live on the ocean floor are sustained by phytoplankton. phytoplankton, microscopic marine photosynthetic organisms, have a vastly significant role to play not only in the marine food web of which they’re part of, but also on a more global scale. despite their infinitely small size in comparison to other marine organisms, these tiny creatures occupy an immensely important ecological niche: they are the foundation of the marine food web, and as primary producers, play key roles in supporting all other organisms in the marine environment, as well as in the regulation of the earth’s climate through the sequestration of carbon, oxygen production, and other related processes. phytoplankton account for roughly half of all global primary productivity; therefore, their significance extends far beyond the marine environment alone. there is an intriguing sense of irony in the realization that these tiny living beings that often live out their existence unnoticed and undetected by the rest of the world, have such a far-reaching impact on the lives of virtually all other living organisms on the planet, particularly on those in the marine environment. the world that we have become accustomed to has been and is continuously shaped by the workings of these miniscule yet vital “plants of the sea”.

hope this !