This procedure has been used to "weigh" astronauts in space: a 42.5 kg chair is attached to a spring and allowed to oscillate. when it is empty, the chair takes 1.30 s to make one complete vibration. but with an astronaut sitting in it, with her feet off the floor, the chair now takes 2.54 s for one cycle.

119.74437 kg

Explanation:

Mass of astronaut = x

Mass of chair = 42.5 kg

Time period is given by

So,

The mass of the astronaut is 119.74437 kg is the required answer.

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c. 7/3

step-by-step explanation:

a rational number is like pi- it is a repeating decimal.

a. is -1.8

b. 2.236068

c. 2.3333333333333333333

d.   is 3

i hope that ! =)