Advertisements
Advertisements
प्रश्न
Suggest a suitable physical situation for the following graph:
उत्तर
The (n-t) graph illustrates that the body experiences acceleration for a brief period of time. As a result, it may represent a physical situation in which a ball, consistently traveling at a uniform pace, is briefly impacted by a bat for a short interval of time.
APPEARS IN
संबंधित प्रश्न
Read the statement below carefully and state, with reason and example, if it is true or false:
A particle in one-dimensional motion with positive value of acceleration must be speeding up.
The given figure gives a speed-time graph of a particle in motion along a constant direction. Three equal intervals of time are shown. In which interval is the average acceleration greatest in magnitude? In which interval is the average speed greatest? Choosing the positive direction as the constant direction of motion, give the signs of v and a in the three intervals. What are the accelerations at the points A, B, C and D?
On a long horizontally moving belt (Fig. 3.26), a child runs to and fro with a speed 9 km h–1 (with respect to the belt) between his father and mother located 50 m apart on the moving belt. The belt moves with a speed of 4 km h–1. For an observer on a stationary platform outside, what is the
(a) speed of the child running in the direction of motion of the belt ?.
(b) speed of the child running opposite to the direction of motion of the belt ?
(c) time taken by the child in (a) and (b) ?
Which of the answers alter if motion is viewed by one of the parents?
If a particle is accelerating, it is either speeding up or speeding down. Do you agree with this statement?
Give example where the velocity of a particle is zero but its acceleration is not zero.
In figure shows the x coordinate of a particle as a function of time. Find the sings of vx and ax at t = t1, t = t2 and t = t3.
A stone is released from an elevator going up with an acceleration a. The acceleration of the stone after the release is
The accelerations of a particle as seen from two frames S1 and S2 have equal magnitude 4 m/s2.
A graph of x versus t is shown in figure. Choose correct alternatives from below.
- The particle was released from rest at t = 0.
- At B, the acceleration a > 0.
- At C, the velocity and the acceleration vanish.
- Average velocity for the motion between A and D is positive.
- The speed at D exceeds that at E.
Give example of a motion where x > 0, v < 0, a > 0 at a particular instant.
