Physics-
General
Easy
Question
A man throws balls with the same speed vertically upwards one after the other at an interval of two seconds. What should be the speed of the throw so that more than two balls are in the sky at any time (Given 
)
- At least
- Any speed less than
- Only with speed
- More than
The correct answer is: More than
Interval of ball throw 
If we want that minimum three (more than two) ball remain in air then time of flight of first ball must be greater than 
For 
, first ball will just about to strike the ground (in air)
Second ball will be at highest point (in air)
Third ball will be at point of projection or at ground (not in air)
Related Questions to study
Physics-
The displacement- time graph for two particles 
and 
are straight lines inclined at angles of 
and 
with the time axis. The ratio of velocities of 
is
The displacement- time graph for two particles and are straight lines inclined at angles of and with the time axis. The ratio of velocities of is
Physics-General
Physics-
The velocity-time relation of an electron starting from rest is given by 
where 
. The distance traversed in first 3 s is
The velocity-time relation of an electron starting from rest is given by where . The distance traversed in first 3 s is
Physics-General
Physics-
Two trains are moving with equal speed in opposite directions along two parallel railway tracks. If the wind is blowing with speed 
along the track so that the relative velocities of the trains with respect to the wind are in the ratio 
, then the speed of each train must be
Two trains are moving with equal speed in opposite directions along two parallel railway tracks. If the wind is blowing with speed along the track so that the relative velocities of the trains with respect to the wind are in the ratio , then the speed of each train must be
Physics-General
Physics-
Look at the graphs [a] to [d] carefully and indicate which of these possibly represents one dimensional motion of a particle
Look at the graphs [a] to [d] carefully and indicate which of these possibly represents one dimensional motion of a particle
Physics-General
Chemistry-
Physical adsorption
Physical adsorption
Chemistry-General
Chemistry-
Adsorption is multilayer in the case of
Adsorption is multilayer in the case of
Chemistry-General
Chemistry-
In physical adsorption, the gas molecules are held on solid surface by
In physical adsorption, the gas molecules are held on solid surface by
Chemistry-General
Chemistry-
When the temperature is lowered and pressure is raised, the adsorption of a gas on a solid
When the temperature is lowered and pressure is raised, the adsorption of a gas on a solid
Chemistry-General
Chemistry-
Point out the wrong statement :Physical adsorption is characterised by
Point out the wrong statement :Physical adsorption is characterised by
Chemistry-General
Chemistry-
A solid acts as an adsorbent because it has
A solid acts as an adsorbent because it has
Chemistry-General
Chemistry-
When the temperature is raised, the viscosity of liquid decreases, this is because
When the temperature is raised, the viscosity of liquid decreases, this is because
Chemistry-General
Chemistry-
If the absorbate is held on a surface by weak Vander Waal's forces, the absorption process is called
If the absorbate is held on a surface by weak Vander Waal's forces, the absorption process is called
Chemistry-General
Chemistry-
Wood charcoal is used to decolourise sugar because it
Wood charcoal is used to decolourise sugar because it
Chemistry-General
Chemistry-
Which among the following statement is false
Which among the following statement is false
Chemistry-General
Chemistry-
Chemisorption
Chemisorption
Chemistry-General
