3 years ago

Screw examples in daily life (simple machines)

1 answer:

5 0

Brace and bits, meat grinder, submarine hatch, screw lid jar, drills, machine screws, door lock, wooden handled cork screw.

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3 years ago

An astronaut drops a marble on the surface of Mars and observes that it takes 1.02 s for the marble to fall 2.00 m. She also kno

Irina-Kira [14]

Answer:

The mass of mars is $6.61\times10^{23}\ kg$

Explanation:

Given that,

Time = 1.02 s

Height = 2.00 m

Radius of mars $r= 3.39\times10^{6}\ m$

We need to calculate the acceleration due to gravity on mars

Using equation of motion

$h = ut+\dfrac{1}{2}gt^2$

$h = \dfrac{1}{2}gt^2$

$g=\dfrac{2h}{t^2}$

Where, u = initial velocity

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h = height

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$g=\dfrac{2\times2.00}{(1.02)^2}$

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We need to calculate the mass of mars

Using formula of gravity

$g=\dfrac{Gm}{r^2}$

Put the value into the formula

$3.84=\dfrac{6.67\times10^{-11}\times m}{(3.39\times10^{6})^2}$

$m=\dfrac{3.84\times(3.39\times10^{6})^2}{6.67\times10^{-11}}$

$m=6.61\times10^{23}\ kg$

Hence, The mass of mars is $6.61\times10^{23}\ kg$

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3 years ago