The angular velocity is represented as
Ө
t
Ѡ
None of these
A particle is moving in a circle of radius R with constant speed v. If radius is doubled, then its centripetal force to keep the same speed gets.
twice as great as before
half
one fourth
remains constant
One complete revolution angular displacement of 'p' in 'T' seconds is equal to
3π radians
2π radians
4π radians
1 revolution =
The force which continuously deflects a particle from its straight line path and makes it travel along a circular path is called
Normal force
Gravitational force
Centripetal force
A cosmonaut is orbiting earth in a spacecraft at an altitude h= 630km with a speed of 8kms-1. If the radius of the earth is 6400 km, the acceleration of the cosmonaut is
9.10ms-2
9.80ms-2
10.0ms-2
9.88 ms-2
A stone of mass 'm' tied to a string of length is rotated in a circle with the other end of the string as the centre. The speed of the stone is 'v'. If the string breaks, the stone will
move towards the centre
move away from the centre
move along tangent
stop
A car is racing on a circular track of 180m radius with a speed of 32 ms-1. What should be the banking angle of the road to avoid chances of skidding of the vehicle at this speed without taking into consideration the friction between the tyre and the road?
45o
60o
30o
15o
Satellites used to know the presence of minerals ores and ground-water are called
communication satellites
spying satellites
remote sensing satellites
weather prediction satellites
In which unit is the Planck’s constant expressed?
Joule
Joule-hertz
Joule-second
Newton-second
