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Length of a simple pendulum is 2m and mass of its bob is 0.2 kg. If the tension in the string exceeds 4N, it will break. If the bob is whirled in horizontal plane, the maximum angle the string can make with vertical during rotation is
30 deg
2.45 deg
3.60 deg
4.90 deg
Two metal balls of equal mass (100 g) are separated by a distance (d). In state 1, shown in the figure, the left ball has a charge of +20 µC, while the right ball has a charge of –20 µC. In state 2, both balls have an identical charge of –40 µC.
An experimenter claims that he took the balls from state 1 to state 2 without causing them to contact anything other than each other. Which of the following statements provides correct evidence for the reasonability of this claim?
The claim is not reasonable, because there was more net charge in the two-ball system in state 2 than in state 1.
2.The claim is not reasonable, because there was identical charge on each ball in state 2.
3.The claim is reasonable, because in both states, each ball carried the same magnitude of charge as the other.
4.The claim is reasonable, because the positive charge in state 1 could have been canceled out by the available negative charge.
When the block topples about A, the normal force :
1) passing through centre mass
2.2) is zero
3.3) shifts to the right and pass through rightmost edge containing A
4.4) is zero if the surface is smooth
A chain of 100 links is 1m long and has a mass of 2kg. With the ends fastened together it is set rotating at 3000 rpm, in a horizontal plane.The centripetal force on each link is
3140N
2.3.14N
3.31.4N
4.314N
The magnitude of displacement and average velocity of the top of the seconds hand of a clock of dial Radius R = 25 cm during t = 10s.
1/2 and 1/40
2.1/4 and 1/20
3.1/4 and 1/40
4.1/2 and 1/30
Starting from rest a wheel rotates with uniform angular acceleration 2 2 rads S . After 4s, if the angular acceleration ceases to act, its angular displacement in the next 4s is
16π rad
2.12π rad
3.8π rad
4.10π rad
Suppose a player hits several baseballs. Which baseball will be in the air for the longest time?
The one with the farthest range.
2.The one which reaches maximum height.
3.The one with the greatest initial velocity.
4.The one leaving the bat at 45° with respect to the ground.
The greatest acceleration or deceleration that a train may have is a. The minimum time in which the train may reach from one station to the other separated by a distance d is
root(d/a)
2.root(2d/a)
3.1/2 root (d/a)
4.2 root(d/a)
An object is tossed vertically into the air with an initial velocity of 8 m/s. Using the sign convention upwards as positive, how does the vertical component of the acceleration ay of the object (after leaving the hand) vary during the flight of the object?
On the way up ay > 0, on the way down ay > 0
2.On the way up ay < 0, on the way down ay > 0
3.On the way up ay > 0, on the way down ay < 0
4.On the way up ay < 0, on the way down ay < 0
The co-ordinates of a moving particle at a time t, are given by, x = 5 sin 10 t, y = 5 cos 10t. The speed of the particle is :
25
2.50
3.10
4.NONE
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