Maths-
General
Easy
Question
If a = 2i+4j-5k, b= i+j+k, c = j+2k then the unit vector parallel to a+b+c is
The correct answer is:
Related Questions to study
Maths-
The ratio in which the line segment joining 
+ 
+ 
and 
+ 
+ 
is divided by x
+y
+z
is
The ratio in which the line segment joining + + and + + is divided by x+y+z is
Maths-General
Physics-
A body initially at rest, starts moving along x-axis in such a way so that its acceleration vs displacement plot is as shown in figure. The maximum velocity of particle is
A body initially at rest, starts moving along x-axis in such a way so that its acceleration vs displacement plot is as shown in figure. The maximum velocity of particle is
Physics-General
Physics-
Each of the three graphs represents acceleration versus time for an object that already has a positive velocity at time t1. Which graphs show an object whose speed is increasing for the entire time interval between t1 and t2?
Each of the three graphs represents acceleration versus time for an object that already has a positive velocity at time t1. Which graphs show an object whose speed is increasing for the entire time interval between t1 and t2?
Physics-General
Physics-
The graph to the right is a plot of position versus time. For which labeled region is the velocity positive and the acceleration negative?
The graph to the right is a plot of position versus time. For which labeled region is the velocity positive and the acceleration negative?
Physics-General
Physics-
A body moves with velocity 
where x is its position The net force acting on body is zero at:
A body moves with velocity where x is its position The net force acting on body is zero at:
Physics-General
Physics-
After firing, a bullet is found to move at an angle of 37° to horizontal. Its acceleration is 10 m/ s 2 downwards. Find the component of acceleration in the direction of the velocity.
After firing, a bullet is found to move at an angle of 37° to horizontal. Its acceleration is 10 m/ s 2 downwards. Find the component of acceleration in the direction of the velocity.
Physics-General
Physics-
A gas bubble oscillates with a time period T proportional to Pa db Ec where P is pressure, d is the density and E is the energy. The values of a, b & c are :
A gas bubble oscillates with a time period T proportional to Pa db Ec where P is pressure, d is the density and E is the energy. The values of a, b & c are :
Physics-General
Physics-
The figure shows a simple harmonic progressive transverse wave, progressing towards the right. The particle having the maximum acceleration directed downwards is represented by
The figure shows a simple harmonic progressive transverse wave, progressing towards the right. The particle having the maximum acceleration directed downwards is represented by
Physics-General
Physics-
Two graphs of the same harmonic wave are shown below. The graph (1) on the left shows the displacement of wave y, as a function of position x for a given instant of time. The graph (2) on the right shows the displacement of wave as a function of time 't' for a given position. The speed of the wave is
Two graphs of the same harmonic wave are shown below. The graph (1) on the left shows the displacement of wave y, as a function of position x for a given instant of time. The graph (2) on the right shows the displacement of wave as a function of time 't' for a given position. The speed of the wave is
Physics-General
Physics-
The prong of a electrically operated tuning fork is connected to a long string 
and tension 25 N. The maximum velocity of the of prong is 1 cm/s, then the average power needed to drive the prong is: 
The prong of a electrically operated tuning fork is connected to a long string and tension 25 N. The maximum velocity of the of prong is 1 cm/s, then the average power needed to drive the prong is:
Physics-General
Physics-
The wave motion has the function 
The graph in the figure w sin (shows how the displacement y at a fixed point varies with time t. Which one of the labelled points shows a displacement equal to that at the position 
at time t = 0?
The wave motion has the function The graph in the figure w sin (shows how the displacement y at a fixed point varies with time t. Which one of the labelled points shows a displacement equal to that at the position at time t = 0?
Physics-General
Physics-
A small bob attached to a light inextensible thread of length l has a periodic time T when allowed to vibrate as a simple pendulum. The thread is now suspended from a fixed end O of a vertical rigid rod of length 
(as in figure). If now the pendulum performs periodic oscillations in this arrangement, the periodic time will be
A small bob attached to a light inextensible thread of length l has a periodic time T when allowed to vibrate as a simple pendulum. The thread is now suspended from a fixed end O of a vertical rigid rod of length (as in figure). If now the pendulum performs periodic oscillations in this arrangement, the periodic time will be
Physics-General
Physics-
Two particles undergo SHM along parallel lines with the same time period (T) and equal amplitudes. At a particular instant, one particle is at its extreme position while the other is at its mean position. They move in the same direction. They will cross each other after a further time 
Two particles undergo SHM along parallel lines with the same time period (T) and equal amplitudes. At a particular instant, one particle is at its extreme position while the other is at its mean position. They move in the same direction. They will cross each other after a further time
Physics-General
Physics-
A system of two identical rods (L-shaped) of mass m and length l are resting on a peg P as shown in the figure. If the system is displaced , find the period of oscillations:qin its plane by a small angle
A system of two identical rods (L-shaped) of mass m and length l are resting on a peg P as shown in the figure. If the system is displaced , find the period of oscillations:qin its plane by a small angle
Physics-General
Physics-
A particle starts from a point P at a distance of A/2 from the mean position O & travels towards left as shown in the figure. If the time period of SHM, executed about O is T and amplitude A then the equation of motion of particle is :
A particle starts from a point P at a distance of A/2 from the mean position O & travels towards left as shown in the figure. If the time period of SHM, executed about O is T and amplitude A then the equation of motion of particle is :
Physics-General
