23357.If a particle moves with uniform speed that its tangential acceleration will be
zero
constant
infinite
none of these
23358.The rider in circus rides along a circular track in a vertical plane. The minimum velocity at the highest point of the track will be
$\sqrt{gR}$
$\sqrt{2gR}$
$\sqrt{3gR}$
$\sqrt{5gR}$
23359.If a stone of mass m is rotated in a vertical circular path of radius 1 m, the critical velocity will be
6.32 m/s
3.13 m/s
9.48 m/s
12.64 m/s
23360.A car of mass 800 kg moves on a circular track of radius 40 m. If the coefficient of friction is 0.5, then maximum velocity with which the car can move is
7 m/s
14 m/s
8 m/s
12 m/s
23361.If T1 and T2 are the periods of a simple pendulum and a conical pendulum respectively, of the same length, then
T1 = T2
T1 > T2
T1 < T2
T1 = $\dfrac{T_2}{2}$
23362.In a vertical circle of radius r at what point in its path, a particle has a tension equal to zero?
Highest point
Lowest point
Any point
An horizontal point
23363.In cycle wheel of radius 0.4 m completes one revolution in one second, then acceleration of the cycle is
0.4 $π$m/s2
0.8 $π$m/s2
0.4 $π$2m/s2
1.6 $π$2m/s2
23364.In order to cause something to move in a circular path, we must apply
Inertial force
Centripetal force
Centrifugal force
Gravitational force
23365.A mass of 5 kg is tied to a string of length 1.0 m and is rotated in vertical circle with a uniform speed of 4 m/s. The tension in the string will be 130 N when the mass is at (g = 10 m/s2)
highest point
mid way
bottom
cannot be justified
23366.In an atom two electrons move round the nucleus in circular orbits of radii R and 4R respectively, the ratio of time taken by them to complete one revolution is
$\dfrac{1}{4}$
$\dfrac{4}{1}$
$\dfrac{8}{1}$
$\dfrac{1}{8}$