1. Estimate the number of times a human heart beats during its lifetime. a. 2 x1

Question

1. Estimate the number of times a human heart beats during its lifetime.

a. 2 x10^6

b. 1x10^8

c.3x10^9

d. 2x10^11

2. A molecule in air is moving at a speed 438 m/s. How many meters would the molecule move during 7.00 ms (millieseconds) if it didn't collide with any other molecules?

3.Kepler's law of planetary motions says that the square of the period of a planet (T^2) is proportional to the cube of the distance of the planet from the sun (r^3). Neptune is 5.787 times as for from the sun as Jupiter. How does the period of neptune compare with the period of Jupiter?

Explanation / Answer

(1) Normal heart beat= 72 beats/ min

so the number of beats in one year=(72 beats/ min)*(60 min/1hour)(24 hours/1day)(365 days/1year)

so the number of beats in one year=37843200

let the average human lifespan= 80 years

so the number of heartbeats during itslifetime=37843200(80)=3.02x109beats

so the option (c) is correct.

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