InterviewSolution
Saved Bookmarks
InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
When a particle moves with constant velocity, its average velocity, its instantaneous velocity and its speed are all equal. Comment on this statement. |
|
Answer» Constant velocity means that a particle has the same direction and speed at every point. So, its average velocity and instantaneous velocity are equal. Its speed being a scalar quantity is equal in magnitude only. |
|
| 2. |
Figure (3-Q1) shows the x- coordinate of a particle as a function of time. Find the signs of vx and ax at t=t1, t= t2 and t=t3. |
|
Answer» If x' and x" be the x-coordinate of the particle at initial time t' and t" respectively then vx =(x"-x')/(t"-t') = tanθ. For t"-t' infinitesimally small it is the vx at that instant. So slope of the tangent at any point in the above graph gives vx . At t=t1, tanθ is positive, so sign of vx is positive. At t= t2 the slope of the curve is horizontal, so tanθ=0 → vx =0. At t=t3 the slope of the curve is negative, so sign of vx is negative. |
|