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Physics

General

Easy

Question

The Gravitational P.E of a body of mas m at the earth's surface is -mg Re. Its gravitational potential energy at a height Re from the earth's surface will be = here (Re is the radius of the earth),

-2mgRe
2mgRe
$\frac{1}{2}$ mgRe
- $- \frac{1}{2} m g$ Re

The correct answer is: - $negative 1 half m g$ Re

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physics-General

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

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 $t equals$

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

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