Physics - Gravitation Question with Solution | TestHub

PhysicsGravitationEnergy & PotentialEasy2 minPYQ_2020

PhysicsEasysingle choice

The gravitational field in a region is given by $\vec{g} = (5 \hat{i} + 12 \hat{j}) N {kg}^{- 1}$ . The change in the gravitational potential energy of a particle of mass $2 kg$ when it is taken from the origin to a point $(7 m, - 3 m)$ is

Options:

Answer:

Solution:

$d V = - \vec{E} . \vec{d r}$

$\Rightarrow ∆ V = - \vec{E} . ∆ \vec{r}$
$= - (5 \hat{i} + 12 \hat{j}) \cdot (7 \hat{i} - 3 \hat{j})$
$= - (35 - 36) = 1$

$⇒Δ U = m Δ V = 2 J$

Subject:PhysicsTopic:GravitationSubtopic:Energy & Potential

⏱ 2mℹ️ Source: PYQ_2020

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