Physics-
A small body of mass
slides down from the top of a hemisphere of radius
. The surface of block and hemisphere are frictionless. The height at which the body lose contact with the surface of the sphere is

Physics-General
Answer:The correct answer is: 
Book A Free Demo

Grade*
Select Grade
Related Questions to study
physics-
The path of a projectile in the absence of air drag is shown in the figure by dotted line. If the air resistance is not ignored then which one of the path is shown in the figure is appropriate for the projectile

If air resistance is taken into consideration then range and maximum height, both will decrease
The path of a projectile in the absence of air drag is shown in the figure by dotted line. If the air resistance is not ignored then which one of the path is shown in the figure is appropriate for the projectile

physics-General
If air resistance is taken into consideration then range and maximum height, both will decrease
physics-
Two identical discs of same radius
are rotating about their axes in opposite directions with the same constant angular speed
. The discs are in the same horizontal plane. At time
, the points
and
are facing each other as shown in figure. The relative speed between the two points
and
is
as function of times best represented by


So,
At
So two half cycles will take place
Two identical discs of same radius
are rotating about their axes in opposite directions with the same constant angular speed
. The discs are in the same horizontal plane. At time
, the points
and
are facing each other as shown in figure. The relative speed between the two points
and
is
as function of times best represented by

physics-General

So,
At
So two half cycles will take place
physics-
The trajectory of a particle moving in vast maidan is as shown in the figure. The coordinates of a position
are
The coordinates of another point at which the instantaneous velocity is same as the average velocity between the points are

The trajectory of a particle moving in vast maidan is as shown in the figure. The coordinates of a position
are
The coordinates of another point at which the instantaneous velocity is same as the average velocity between the points are

physics-General
physics-
The time taken by the projectile to reach from
to
is
then the distance
is equal to

Horizontal component of velocity at 




The time taken by the projectile to reach from
to
is
then the distance
is equal to

physics-General
Horizontal component of velocity at 




physics-
The resultant of a system of forces shown in figure is a force of 10 N parallel to given forces through
, where
equals

Equating the moments about 


The resultant of a system of forces shown in figure is a force of 10 N parallel to given forces through
, where
equals

physics-General
Equating the moments about 


physics-
A frictionless track
ends in a circular loop of radius
figure. A body slides down the track from point
which is at a height
cm. Maximum value of
for the body to successfully complete the loop is

For successfully completing the loop,

A frictionless track
ends in a circular loop of radius
figure. A body slides down the track from point
which is at a height
cm. Maximum value of
for the body to successfully complete the loop is

physics-General
For successfully completing the loop,

physics-
A piece of wire is bent in the shape of a parabola
-axis vertical) with a bead of mass
on it. The bead can side on the wire without friction. It stays at the lowest point of the parabola when the wire is at rest. The wire is now accelerated parallel to the
-axis with a constant acceleration
. The distance of the new equilibrium position of the bead, where the bead can stay at rest with respect to the wire, from the
-axis is

A piece of wire is bent in the shape of a parabola
-axis vertical) with a bead of mass
on it. The bead can side on the wire without friction. It stays at the lowest point of the parabola when the wire is at rest. The wire is now accelerated parallel to the
-axis with a constant acceleration
. The distance of the new equilibrium position of the bead, where the bead can stay at rest with respect to the wire, from the
-axis is

physics-General
physics-
A particle of mass
is rotating in a horizontal circle of radius
and is attached to a hanging mass
as shown in the figure. The speed of rotation required by the mass
keep
steady is

To keep the mass M steady, let T is the tension in the string joining the two. Then for particle 

For mass

From Eqs. (i) and (ii)


For mass
From Eqs. (i) and (ii)

A particle of mass
is rotating in a horizontal circle of radius
and is attached to a hanging mass
as shown in the figure. The speed of rotation required by the mass
keep
steady is

physics-General
To keep the mass M steady, let T is the tension in the string joining the two. Then for particle 

For mass

From Eqs. (i) and (ii)


For mass
From Eqs. (i) and (ii)

physics-
A point mass
is suspended from a light thread of length
fixed at
, is whirled in a horizontal circle at constant speed as shown. From your point of view, stationary with respect to the mass, the forces on the mass are
A point mass
is suspended from a light thread of length
fixed at
, is whirled in a horizontal circle at constant speed as shown. From your point of view, stationary with respect to the mass, the forces on the mass are
physics-General
physics-
A string of length
is fixed at one end and carries a mass
at the other end. The string makes
revolutions per
around the vertical axis through the fixed end as shown in figure , then tension in the string is
From (i) and (ii)

A string of length
is fixed at one end and carries a mass
at the other end. The string makes
revolutions per
around the vertical axis through the fixed end as shown in figure , then tension in the string is
physics-General
From (i) and (ii)

physics-
From an inclined plane two particles are projected with same speed at same angle
, one up and other down the plane as shown in figure, which of the following statements is/are correct?


So,
From an inclined plane two particles are projected with same speed at same angle
, one up and other down the plane as shown in figure, which of the following statements is/are correct?

physics-General

So,
physics-
A fighter plane enters inside the enemy territory, at time
with velocity
and moves horizontally with constant acceleration
(see figure). An enemy tank at the border, spot the plane and fire shots at an angle
with the horizontal and with velocity
. At what altitude
of the plane it can be hit by the shot?
If it is being hit then

or





or

A fighter plane enters inside the enemy territory, at time
with velocity
and moves horizontally with constant acceleration
(see figure). An enemy tank at the border, spot the plane and fire shots at an angle
with the horizontal and with velocity
. At what altitude
of the plane it can be hit by the shot?
physics-General
If it is being hit then

or





or

physics-
A particle is moving on a circular path of radius
with uniform velocity
. The change in velocity when the particle moves from
to
is

Change in velocity 
A particle is moving on a circular path of radius
with uniform velocity
. The change in velocity when the particle moves from
to
is

physics-General
Change in velocity 
physics-
A particle is projected from a point
with velocity
at an angle of
with horizontal as shown in figure. It strikes the plane
at right angles. The velocity of the particle at the time of collision is

Let
be the velocity at the time of collision

Then,

Then,
A particle is projected from a point
with velocity
at an angle of
with horizontal as shown in figure. It strikes the plane
at right angles. The velocity of the particle at the time of collision is

physics-General
Let
be the velocity at the time of collision

Then,

Then,
chemistry-
Assertion: At constant pressure for the change H2O(s)→H2O(g) work done is negative.
Reason: During phase transition work done is always negative.
Assertion: At constant pressure for the change H2O(s)→H2O(g) work done is negative.
Reason: During phase transition work done is always negative.
chemistry-General