Direction of Instantaneous Velocity
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Two trains each 50m long are travelling in opposite direction with velocity 10m/s and 15m/s. The time of crossing is..
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- λ√24πϵ0l[−2i+14j]
- λ√24πϵ0l[−2i+14j]
- Zero
- None of these
a train is moving towards east with a speed of 20m/s . A person is running on the roof of the train with a speed 3m/s against the motion of train . Velocity of the person as seen by an observer on ground will be-
Ans is 17m/s towards east..how?
Obtain the expression of relative velocity
A particle starts from a point A and travels along the sold curve shown in figure. Find approximaterly the position B of the particle such that the average velocity between the position A and B has the same direction as the instantaneous velocity at B
Suppose the platform with the kid in the previous problem is rotating in anticlockwise direction at an angular speed ω. The kid starts walking along the rim with a speed v relative to the platform also in the anticlockwise direction. Find the new angular speed of the platform.
Two cars A and B are moving in same direction with a speed of 30km per hr. They are separated from each other by 5 km. Third car moving in the opposite direction meets the two cars after an interval of 4 mins. The speed of third car is ? ( use relative velocity to solve the problem)
1. 30km per hr
2. 25km per hr
3. 40km per hr
4. 45km per hr
A car travels equal distances in the same direction with velocities of respectively. The average velocity of the car over the whole journey is
5m/s
6m/s
7m/s
8m/s
- there is a non-zero contact force between two blocks.
- both blocks will move sepeartely
- both blocks will move together
- none of these
If, in Exercise 5.21, the speed of the stone is increased beyond the maximum permissible value, and the string breaks suddenly, which of the following correctly describes the trajectory of the stone after the string breaks:
a) the stone moves radially outwards,
b) the stone flies off tangentially from the instant the string breaks,
c) the stone flies off at an angle with the tangent whose magnitude depends on the speed of the particle ?
A clock has a minute hand of length 14 cm. At what speed does the tip of the minute hand move in a duration of half an hour?
A particle moves along a circle of radius . Determine the distance and magnitude of displacement after
(a) revolution
(b) revolutions
(c) revolutions
- 40√2 km/h N-E
- 40√2 km/h S-E
- 40√2 km/h N-W
- 40√2 km/h S-W
A bus moves with uniform velocity along a straight-line path. If the average velocity of the bus is then its instantaneous velocity at is _______ .
70
100
80
zero
What is speed?
What do you understand by the given statement: The path length covered by a body is zero?
- 10 sec
- 36 sec
- 18 sec
- 180 sec
- 0.8 kg/s
- 0.6 kg/s
- 0.4 kg/s
- 0.2 kg/s
- 20ms−1
- 5011ms−1
- 18011ms−1
- 30ms−1
The position vector →r=5.00t^i+(et+ft2)^j locates a particle as a function of time t. Vector →r is in meters, t is in seconds, and factors e and f are constants. Below Diagram gives the angle θ of the particle's direction of travel as a function of t(θ) is measured from the positive x direction). What are 'e' and 'f', including units?
e=356√3 m/s, f=−524√3 m/s2
e=−356√3 m/s, f=524√3 m/s
e=356√3 m/s, f=524√3 m/s2
e=356√3 m/s, f=524√3 m/s2
- Speed is uniform
- Momentum is uniform
- Velocity is uniform
- All of these
- True
- False
- 6.0 m
- 8.0 m
- 6.5 m
- 7.0 m
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- 38 s
- None of these
- 6 s
- 36 s