MCQ
Position of a particle in a rectangular-co-ordinate system is $(3,2,5)$. Then its position vector will be
- A$3 \hat{i}+5 \hat{j}+2 \hat{k}$
- ✓$3 \hat{i}+2 \hat{j}+5 \hat{k}$
- C$5 \hat{i}+3 \hat{j}+2 \hat{k}$
- DNone of these
✓
Answer
Correct option: B.
$3 \hat{i}+2 \hat{j}+5 \hat{k}$
(b) If a point have coordinate $(x, y, z)$ then its position vector $=x \hat{i}+y \hat{j}+z \hat{k}$.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
A body of mass $5 \mathrm{~kg}$ explodes at rest into three fragments with masses in the ratio $1: 1: 3$. The fragments with equal masses fly in mutually perpendicular directions with speeds of $21 \mathrm{~m} / \mathrm{s}$. The velocity of the heaviest fragment will be
→A spring having a spring constant $~ K$ ' is loaded with a mass ' $m$ '. The spring is cut into two equal parts and one of these is loaded again with the same mass. The new spring constant is
→If an ammeter is connected in parallel to a circuit, it is likely to be damaged due to excess
A stone ties to the end of a string $1 m$ long is whirled in a horizontal circle with a constant speed. If the stone makes 22 revolution in 44 seconds, what is the magnitude and direction of acceleration of the stone
→Heat travels through vacuum by
A thermally insulated container is divided into two parts by a screen. In one part the pressure and temperature are $P$ and $T$ for an ideal gas filled. In the second part it is vacuum. If now a small hole is created in the screen, then the temperature of the gas will
→A ray of light propagates from glass (refractive index $=3 / 2$ ) to water (refractive index $=4 / 3$ ). The value of the critical angle
→An ideal gas is taken through the cycle $A \rightarrow B \rightarrow C \rightarrow A$, as shown in the figure. If the net heat supplied to the gas in the cycle is $5 \mathrm{~J}$, the work done by the gas in the process $C \rightarrow A$ is
→A pure semiconductor behaves slightly as a conductor at
In MKS system, Stefan's constant is denoted by $\sigma$. In CGS system multiplying factor of $\sigma$ will be
→