Physics-
General
Easy
Question
A block of mass 1 kg slides down a curved track that is one quadrant of a circle of radius 1m. Its speed at the bottom is 2 m/s. The work done by the frictional force is
- 9 J
The correct answer is:
Related Questions to study
physics-
If the system in the figure is released from rest in the configuration shown, find the velocity of the block Q after it has fallen through a distance 10 meters, given mass of 
If the system in the figure is released from rest in the configuration shown, find the velocity of the block Q after it has fallen through a distance 10 meters, given mass of
physics-General
physics-
A bob is suspended from a crane by a cable of length 
The crane and load are moving at a constant speed 
The crane is stopped by a bumper and the bob on the cable swings out an angle of 
The initial speed 
is 
A bob is suspended from a crane by a cable of length The crane and load are moving at a constant speed The crane is stopped by a bumper and the bob on the cable swings out an angle of The initial speed is
physics-General
physics-
A particle is given an initial speed u inside a smooth spherical shell of radius 
m that it is just able to complete the circle. Acceleration of the particle when its velocity becomes vertical is
A particle is given an initial speed u inside a smooth spherical shell of radius m that it is just able to complete the circle. Acceleration of the particle when its velocity becomes vertical is
physics-General
physics-
A particle is moved from 
to 
under a force 
from two paths. Path 1 is OP and 2 is OQP. Let 
and 
be the work done by this force in these two paths. Then
A particle is moved from to under a force from two paths. Path 1 is OP and 2 is OQP. Let and be the work done by this force in these two paths. Then
physics-General
chemistry-
The standard emf of a galvanic cell involving cell reaction with n=2 is found to be 0.295 V at 25°C. The equilibrium constant of the reaction would be - given F=96500e 
The standard emf of a galvanic cell involving cell reaction with n=2 is found to be 0.295 V at 25°C. The equilibrium constant of the reaction would be - given F=96500e
chemistry-General
chemistry-
Which of the following reaction occurs in a Daniel cell
Which of the following reaction occurs in a Daniel cell
chemistry-General
physics-
A rocket is fired and ascends with constant vertical acceleration of 10m/s2 for 1 minute Its fuel is exhausted and it continues as a free particle The maximum altitude reached is (
)
A rocket is fired and ascends with constant vertical acceleration of 10m/s2 for 1 minute Its fuel is exhausted and it continues as a free particle The maximum altitude reached is ( )
physics-General
physics-
If 
and 
, then 
is
If and , then is
physics-General
physics-
At time t = 0, terminal A in the circuit shown in the figure is connected to B by a key and an alternating current I(t) = I0 cos(
t) with 
= 1A and = 500 rad/s starts flowing in it with the initial direction shown in the figure.
the key is switched from B to D. Now onwards only A and D are connected. A total charge Q flows from the battery to charge the capacitor fully. If C = 20 
, R = 10 
and the battery is ideal with emf of 50 V, identify the correct statement(s).
At time t = 0, terminal A in the circuit shown in the figure is connected to B by a key and an alternating current I(t) = I0 cos(t) with = 1A and = 500 rad/s starts flowing in it with the initial direction shown in the figure.
the key is switched from B to D. Now onwards only A and D are connected. A total charge Q flows from the battery to charge the capacitor fully. If C = 20 , R = 10 and the battery is ideal with emf of 50 V, identify the correct statement(s).
physics-General
physics-
In the given circuit, the AC source has = 100 rad/s. considering the inductor and capacitor to be ideal, the correct choice(S) is(are)
In the given circuit, the AC source has = 100 rad/s. considering the inductor and capacitor to be ideal, the correct choice(S) is(are)
physics-General
physics-
In an L–R series circuit, a sinusoidal voltage 
is applied. It is given that L = 35 mH, R = 11, Vrms = 220 V, 
and 
= 22/7. Find the amplitude of current in the steady state and obtain the phase difference between the current and the voltage. Also plot the variation of current for one cycle on the given graph.
An AC voltage source of variable angular frequency and fixed amplitude V connected in series with a capacitance C and an electric bulb of resistance R (inductance zero). When is increased :
In an L–R series circuit, a sinusoidal voltage is applied. It is given that L = 35 mH, R = 11, Vrms = 220 V, and = 22/7. Find the amplitude of current in the steady state and obtain the phase difference between the current and the voltage. Also plot the variation of current for one cycle on the given graph.
An AC voltage source of variable angular frequency and fixed amplitude V connected in series with a capacitance C and an electric bulb of resistance R (inductance zero). When is increased :
physics-General
physics-
When an AC source of emf 
is connected across a circuit, the phase difference between the E and the current i in the circuit is observed to be 
, as shown in the diagram. If the circuit consists possibly only of R-C or R-L or L-C series, find the relationship between the two elements.
When an AC source of emf is connected across a circuit, the phase difference between the E and the current i in the circuit is observed to be , as shown in the diagram. If the circuit consists possibly only of R-C or R-L or L-C series, find the relationship between the two elements.
physics-General
physics-
An LCR circuit is equivalent to a damped pendulum. In an LCR circuit the capacitor is charged to 
and then connected to the L and R as shown below :
If a student plots graphs of the square of maximum charge 
on the capacitor with time (T) for two different values 
and 
of L then which of the following represents this graph correctly ? (Plots are shematic and not drawn to scale)
An LCR circuit is equivalent to a damped pendulum. In an LCR circuit the capacitor is charged to and then connected to the L and R as shown below :
If a student plots graphs of the square of maximum charge on the capacitor with time (T) for two different values and of L then which of the following represents this graph correctly ? (Plots are shematic and not drawn to scale)
physics-General
physics-
In the LCR circuit shown in figure unknown resistance and alternating voltage source are connected. When switch 'S' is closed then there is a phase difference of 
between current and applied voltage and voltage across resister is 
When switch is open current and applied voltage are in same phase. Neglecting resistance of connecting wire answer the following questions :
Peak voltage of applied voltage sources is :
In the LCR circuit shown in figure unknown resistance and alternating voltage source are connected. When switch 'S' is closed then there is a phase difference of between current and applied voltage and voltage across resister is When switch is open current and applied voltage are in same phase. Neglecting resistance of connecting wire answer the following questions :
Peak voltage of applied voltage sources is :
physics-General
physics-
A voltage source V = 
sin (100 t) is connected to a black box in which there can be either one element out of L, C, R or any two of them connected in series
At steady state. the variation of current in the circuit and the source voltage are plotted together with time, using an oscilloscope, as shown
If AC source is removed, the circuit is shorted for some time so that capacitor is fully discharged and then a battery of constant EMF is connected across the black box, at t = 0. The current in the circuit will –
A voltage source V = sin (100 t) is connected to a black box in which there can be either one element out of L, C, R or any two of them connected in series
At steady state. the variation of current in the circuit and the source voltage are plotted together with time, using an oscilloscope, as shown
If AC source is removed, the circuit is shorted for some time so that capacitor is fully discharged and then a battery of constant EMF is connected across the black box, at t = 0. The current in the circuit will –
physics-General
