To a person, going eastward in a car with a velocity of 25 km/hr, a train appears to move towards north with a velocity of km/hr. The actual velocity of the train will be
=
= = = 50 km/hr
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To a person, going eastward in a car with a velocity of 25 km/hr, a train appears to move towards north with a velocity of km/hr. The actual velocity of the train will be
=
= = = 50 km/hr
A bus is moving with a velocity 10 m/s on a straight road. A scooterist wishes to overtake the bus in 100 s. If the bus is at a distance of 1 km from the scooterist, with what velocity should the scooterist chase the bus
Let the velocity of the scooterist =v
Relative velocity of scooterist with respect to bus = (v – 10)
∴
The x and y coordinates of the particle at any time are x=5t-2 and y=10t respectively, where x and y are in the metres and t is in seconds. The acceleration of the particle at t=2s is :
(c) Given, x=5t-2
The velocity of the particle in the x-direction,
Acceleration,
The velocity of the particle in the y-direction,
or
Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time . On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time . The time taken by her to walk up on the moving escalator will be
(c)
A particle moves so that its position vector is given by is a constant. Which of the following is true?
A body is moving with velocity 30 m/s towards east. After 10 s its velocity becomes 40 m/s towards north. The average acceleration of the body is
Average acceleration
A particle moves in the x-y plane according to rule and . The particle follows
This is an equation of a circle, so the particle follows a circular path.
The coordinates of a moving particle at a time t, are given by, x=5 sin 10t, y=5 cos 10t. The speed of the particle is:
(B)
For a rocket moving in free space, the fraction of mass to be disposed of Off to attain a speed equal to two times the exhaust speed is given by (given = 7.4)
This is a fraction of mass remaining. Hence fraction of mass disposed of = 0.86.
A simple pendulum hangs from the roof of a train moving on horizontal rails. If the string is inclined towards the front of the train, then train is
Using concept of inertia
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