The space shuttle travels at a speed of about 76times103 ms

The space shuttle travels at a speed of about 7.6times10^3 m/s. The blink of an astronaut\'s eye lasts about 110 ms. How many football fields (length=91.4 m) does the shuttle cover in the blink of an eye? The three-toed sloth is the slowest-moving land mammal. On the ground, the sloth moves at an average speed of 0.033 m/s, considerably slower than the giant tortoise have gone relative to the sloth? Do not put units in your answer.

Solution

1.

Distance travelled by the astronout

d=Vt =(7.6*10³)(110*10^-3)

d=836 m

Number of football fields cover by the shuttle in blink of the eye is

N=d/L =836/91.4 =9.15 football fields

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2.

t=12 min =12*60 =720 s

In 12 minutes a sloth travels distance of

X_s =V_st = 0.033*720 =23.76 m

In 12 minutes a tortise travels a distance of

X_t=V_tt =0.073*720 =52.56 m

The tortise goes a farther distance than the sloth by

d=X_t-X_s =52.56-23.76

d=28.8 m