A person weighs a fish of mass m on a spring scale attached to the ceiling of an

Question

A person weighs a fish of mass m on a spring scale attached to the ceiling of an elevator as illustrated in the figure.

(A) Show that if the elevator accelerates either upward or downward, the spring scale gives a reading that is different from the weight of the fish.

(B) Evaluate the scale readings for a 47 N fish if the elevator moves with an acceleration ay = ? 2.36 m/s2.

Suppose that during the launch of a rocket from the surface of the earth, an astronaut onboard the rocket stands on a bathroom scale and measures her weight to be 5.4 times her normal weight. Determine the acceleration of the rocket. m/s2 (upward)

Explanation / Answer

A). when it accelerates upward net weght = m(g+a) when acc downward = m(g-a) B). ay = 2.36 F = 47/9.8 ( 9.8 + 2.36) = 58.32N ay = -2.36 F = 35.68N C). g + a = 5.4g a = 4.4g = 43.12m/s^2

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