Physics-
General
Easy
Question
The spool shown in figure is placed on rough horizontal surface and has inner radius r and outer radius R. The angle q between the applied force and the horizontal can be varied. The critical angle (q) for which the spool does not roll and remains stationary is given by
The correct answer is:
Related Questions to study
physics-
A uniform rod of length L and weight W is suspended horizontally by two vertical ropes as shown. The first rope is attached to the left end of the rod while the second rope is attached a distance L 4 from the right end. The tension in the second rope is
A uniform rod of length L and weight W is suspended horizontally by two vertical ropes as shown. The first rope is attached to the left end of the rod while the second rope is attached a distance L 4 from the right end. The tension in the second rope is
physics-General
physics-
A uniform cylinder rests on a cart as shown. The coefficient of static friction between the cylinder and the cart is 0.5. If the cylinder is 4 cm in diameter and 10 cm in height, which of the following is the minimum acceleration of the cart needed to cause the cylinder to tip over?
A uniform cylinder rests on a cart as shown. The coefficient of static friction between the cylinder and the cart is 0.5. If the cylinder is 4 cm in diameter and 10 cm in height, which of the following is the minimum acceleration of the cart needed to cause the cylinder to tip over?
physics-General
physics-
A uniform ladder of length 5m is placed against the wall as shown in the figure. If coefficient of friction m is the same for both the walls, what is the minimum value of 
for it not to slip?
A uniform ladder of length 5m is placed against the wall as shown in the figure. If coefficient of friction m is the same for both the walls, what is the minimum value of for it not to slip?
physics-General
physics-
A smooth rod of length l is kept inside a trolley at an angle 
as shown in the figure. What should be the acceleration a of the trolley so that the rod remains in equilibrium with respect to it?
A smooth rod of length l is kept inside a trolley at an angle as shown in the figure. What should be the acceleration a of the trolley so that the rod remains in equilibrium with respect to it?
physics-General
physics-
Find minimum height of obstacle so that the sphere can stay in equilibrium
Find minimum height of obstacle so that the sphere can stay in equilibrium
physics-General
physics-
A homogeneous cubical brick lies motionless on a rough inclined surface. The half of the brick which applies greater pressure on the plane is :
A homogeneous cubical brick lies motionless on a rough inclined surface. The half of the brick which applies greater pressure on the plane is :
physics-General
chemistry-
Which of the following metal salts gives a red and opaque borax bead in the reducing flame (in cold) ?
Which of the following metal salts gives a red and opaque borax bead in the reducing flame (in cold) ?
chemistry-General
chemistry-
CoS (black) obtained in group IV of salt analysis is dissolved in aqua regia and is treated with an excess of NaHCO3 and then Br2 water. An apple green coloured stable complex is formed. It is :
CoS (black) obtained in group IV of salt analysis is dissolved in aqua regia and is treated with an excess of NaHCO3 and then Br2 water. An apple green coloured stable complex is formed. It is :
chemistry-General
chemistry-
Which of the following is/are correctly matched ?
Which of the following is/are correctly matched ?
chemistry-General
chemistry-
In which of the following pairs the precipitates are red and black coloured respectively and both precipitates are soluble in excess KI solution ?
In which of the following pairs the precipitates are red and black coloured respectively and both precipitates are soluble in excess KI solution ?
chemistry-General
chemistry-
When chlorine (Cl2) water in excess is added to a salt solution containing chloroform, chloroform layer turns pale yellow. Salt contains :
When chlorine (Cl2) water in excess is added to a salt solution containing chloroform, chloroform layer turns pale yellow. Salt contains :
chemistry-General
chemistry-
Zinc pieces are added to acidified solution of SO32 – . Gas liberated can :
Zinc pieces are added to acidified solution of SO32 – . Gas liberated can :
chemistry-General
chemistry-
Statement - 1 : Silica is added as a flux in reverberatory furnace, in the extraction of copper from copper pyrites.
Statement - 2 : Silica decreases the melting point of the ore and remove the impurity of lead sulphide as PbSiO3 .
Statement - 1 : Silica is added as a flux in reverberatory furnace, in the extraction of copper from copper pyrites.
Statement - 2 : Silica decreases the melting point of the ore and remove the impurity of lead sulphide as PbSiO3 .
chemistry-General
physics-
Which of the following wiring diagrams could be used to experimentally determine R using ohm's law? Assume an ideal voltmeter and an ideal ammeter.
Which of the following wiring diagrams could be used to experimentally determine R using ohm's law? Assume an ideal voltmeter and an ideal ammeter.
physics-General
physics-
In the arrangement shown in figure when the switch S2 is open, the galvanometer shows no deflection for l = L/2. When the switch S2 is closed, the galvanometer shows no deflection for l = 5L 12. The internal resistance (r) of 6 V cell, and the emf E of the other battery are respectively
In the arrangement shown in figure when the switch S2 is open, the galvanometer shows no deflection for l = L/2. When the switch S2 is closed, the galvanometer shows no deflection for l = 5L 12. The internal resistance (r) of 6 V cell, and the emf E of the other battery are respectively
physics-General
