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Physics

General

Easy

Question

The escape velocity of a sphere of mass m from earth having mass M and Radius R is given by

$\sqrt{\frac{2 G M}{R}}$
2 $\sqrt{\frac{G M}{R}}$
$\sqrt{\frac{2 G M m}{R}}$
$\sqrt{\frac{G M}{R}}$

The correct answer is: $square root of fraction numerator 2 G M over denominator R end fraction end root$

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physics-General

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For this question, we should know the rules of dot product.

$text If end text a with not stretchy bar on top equals ı with not stretchy bar on top plus 2 ȷ with not stretchy bar on top plus 3 k with not stretchy bar on top comma b with not stretchy bar on top equals negative ı with not stretchy bar on top plus 2 ȷ with not stretchy bar on top plus k with not stretchy bar on top comma c with not stretchy bar on top equals 3 ı with not stretchy bar on top plus ȷ with not stretchy bar on top text and end text a with not stretchy bar on top plus t b with not stretchy bar on top$ is perpendicular to $stack c with ‾ on top$ , then $t equals$

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parallel

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