Physics-
General
Easy
Question
A boy throws a cricket ball from the boundary to the wicket-keeper. If the frictional force due to air cannot be ignored, the forces acting on the ball at the position X are respected by





The correct answer is: 
The forces acting on the ball will be (i) in the direction opposite to its motion
frictional force and(ii) weight
.
Related Questions to study
physics-
Four capacitors are connected as shown in figure. The equivalent capacitance between
and
is

Capacitance between A and B
Four capacitors are connected as shown in figure. The equivalent capacitance between
and
is

physics-General
Capacitance between A and B
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-
In a circuit shown in figure, the potential difference across the capacitor of 2 F is

In a circuit shown in figure, the potential difference across the capacitor of 2 F is

physics-General
physics-
The effective capacitance between points
and
shown in figure. Assuming
F and that outer capacitors are all
F is

The arrangement shows a Wheatstone bridge.
As
therefore the bridge is balanced.

Similarly,
effective capacitance

As
Similarly,
The effective capacitance between points
and
shown in figure. Assuming
F and that outer capacitors are all
F is

physics-General
The arrangement shows a Wheatstone bridge.
As
therefore the bridge is balanced.

Similarly,
effective capacitance

As
Similarly,
physics-
The four capacitors, each of 25
F are connected as shown in figure. The DC voltmeter reads 200 V. the change on each plate of capacitor is

Charge on each plate of each capacitor


The four capacitors, each of 25
F are connected as shown in figure. The DC voltmeter reads 200 V. the change on each plate of capacitor is

physics-General
Charge on each plate of each capacitor


physics-
For the circuit shown in figure the charge on 4
F capacitor is

Combined capacity of
and
= 1 + 5=
Now,
and
are in series.


Charge in the arm containing
capacitor is

Now,
Charge in the arm containing
For the circuit shown in figure the charge on 4
F capacitor is

physics-General
Combined capacity of
and
= 1 + 5=
Now,
and
are in series.


Charge in the arm containing
capacitor is

Now,
Charge in the arm containing
Physics-
A particle originally at a rest at the highest point of a smooth circle in a vertical plane, is gently pushed and starts sliding along the circle. It will leave the circle at a vertical distance
below the highest point such that

From law of conservation of energy, potential energy of fall gets converted to kinetic energy.




Also, the horizontal component of force is equal centrifugal force.

From Eq. (i)

From





Also, the horizontal component of force is equal centrifugal force.
From Eq. (i)
From
A particle originally at a rest at the highest point of a smooth circle in a vertical plane, is gently pushed and starts sliding along the circle. It will leave the circle at a vertical distance
below the highest point such that

Physics-General
From law of conservation of energy, potential energy of fall gets converted to kinetic energy.




Also, the horizontal component of force is equal centrifugal force.

From Eq. (i)

From





Also, the horizontal component of force is equal centrifugal force.
From Eq. (i)
From
Maths-
Polar of origin (0, 0) w.r.t. the circle
touches the circle
, if
Polar of origin (0, 0) w.r.t. the circle
touches the circle
, if
Maths-General
physics-
Electrons ejected from the surface of a metal, when light of certain frequency is incident on it, are stopped fully by a retarding potential of 3 volts Photo electric effect in this metallic surface begins at a frequency 6 x 1014s -1 The frequency of the incident light in s-1 is [h=6 x 10-34J-sec;charge on the electron=1.6x10-19C]
Electrons ejected from the surface of a metal, when light of certain frequency is incident on it, are stopped fully by a retarding potential of 3 volts Photo electric effect in this metallic surface begins at a frequency 6 x 1014s -1 The frequency of the incident light in s-1 is [h=6 x 10-34J-sec;charge on the electron=1.6x10-19C]
physics-General
physics-
Trajectories of two projectiles are shown in figure. Let
and
be the time periods and
and
their speeds of projection. Then

Maximum height and time of flight depend on the vertical component of initial velocity

Here
Range


Here
Range
Trajectories of two projectiles are shown in figure. Let
and
be the time periods and
and
their speeds of projection. Then

physics-General
Maximum height and time of flight depend on the vertical component of initial velocity

Here
Range


Here
Range
physics-
A body is projected up a smooth inclined plane with a velocity
from the point
as shown in figure. The angle of inclination is
and top
of the plane is connected to a well of diameter 40 m. If the body just manages to cross the well, what is the value of
? Length of the inclined plane is
, and 

Let
be the velocity acquired by the body at
which will be moving making an angle
with the horizontal direction. As the body just crosses the well so 
or
or
Taking motion of the body from
to
along the inclined plane we have


As

or
or 
or
or
Taking motion of the body from
As
or
A body is projected up a smooth inclined plane with a velocity
from the point
as shown in figure. The angle of inclination is
and top
of the plane is connected to a well of diameter 40 m. If the body just manages to cross the well, what is the value of
? Length of the inclined plane is
, and 

physics-General
Let
be the velocity acquired by the body at
which will be moving making an angle
with the horizontal direction. As the body just crosses the well so 
or
or
Taking motion of the body from
to
along the inclined plane we have


As

or
or 
or
or
Taking motion of the body from
As
or
Maths-
The equation of the circumcircle of the triangle formed by the lines
and y=0 is
The equation of the circumcircle of the triangle formed by the lines
and y=0 is
Maths-General
physics-
Which of the substance
or
has the highest specific heat? The temperature
time graph is shown

Substances having more specific heat take longer time to get heated to a higher temperature and longer time to get cooled.

If we draw a line parallel to the time axis then it cuts the given graphs at three different points. Corresponding points on the times axis shows that


If we draw a line parallel to the time axis then it cuts the given graphs at three different points. Corresponding points on the times axis shows that
Which of the substance
or
has the highest specific heat? The temperature
time graph is shown

physics-General
Substances having more specific heat take longer time to get heated to a higher temperature and longer time to get cooled.

If we draw a line parallel to the time axis then it cuts the given graphs at three different points. Corresponding points on the times axis shows that


If we draw a line parallel to the time axis then it cuts the given graphs at three different points. Corresponding points on the times axis shows that
physics-
The figure shows a system of two concentric spheres of radii
and
and kept at temperatures
and
respectively. The radial rate of flow of heat in a substance between the two concentric spheres, is proportional to

To measure the radial rate of heat flow, we have to go for integration technique as here the area of the surface through which heat will flow is not constant.

Let us consider an element (spherical shell) of thickness d
and radius
as shown in figure. Let us first find the equivalent thermal resistance between inner and outer sphere.
Resistance of shell=


=
Rate of heat flow = H
=
=


Let us consider an element (spherical shell) of thickness d
Resistance of shell=
=
Rate of heat flow = H
=
=
The figure shows a system of two concentric spheres of radii
and
and kept at temperatures
and
respectively. The radial rate of flow of heat in a substance between the two concentric spheres, is proportional to

physics-General
To measure the radial rate of heat flow, we have to go for integration technique as here the area of the surface through which heat will flow is not constant.

Let us consider an element (spherical shell) of thickness d
and radius
as shown in figure. Let us first find the equivalent thermal resistance between inner and outer sphere.
Resistance of shell=


=
Rate of heat flow = H
=
=


Let us consider an element (spherical shell) of thickness d
Resistance of shell=
=
Rate of heat flow = H
=
=
maths-
If the line y = x + 3 meets the circle
at A and B, then equation of the circle on AB as diameter is
If the line y = x + 3 meets the circle
at A and B, then equation of the circle on AB as diameter is
maths-General