Explanation:
Because the downward acceleration and the initial velocity in downward direction of the two bullets are the same, they will take the same time to hit the ground and for a half projectile.
Time of flight $=\text{T}=\sqrt{\frac{2\text{h}}{\text{g}}}$
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$\text{zero}$
$\frac{1}{8}\omega\text{Bl}^2$
$\frac{1}{2}\omega\text{Bl}^2$
$\text{B}\omega\text{l}^2$
Two long wires are hanging freely. They are joined first in parallel and then in series and then are connected with a battery. In both cases, which type of force acts between the two wires
|
(a) Attraction force when in parallel and repulsion force when in series |
|
(b) Repulsion force when in parallel and attraction force when in series |
|
(c) Repulsion force in both cases |
|
(d) Attraction force in both cases |
Two ions having masses in the ratio 1 : 1 and charges 1 : 2 are projected into uniform magnetic field perpendicular to the field with speeds in the ratio 2 : 3. The ratio of the radii of circular paths along which the two particles move is
|
(a) 4 : 3 |
(b) 2 : 3 |
(c) 3 : 1 |
(d) 1 : 4 |
A nucleus with mass number 220 initially at rest emits an a-particle. If the Q value of the reaction is 5.5 MeV, calculate the kinetic energy of the a-particle
|
(a) 4.4 MeV |
(b) 5.4 MeV |
(c) 5.6 MeV |
(d) 6.5 MeV |
An electron and a proton are in a uniform electric field, the ratio of their accelerations will be
|
(a) Zero |
|
(b) Unity |
|
(c) The ratio of the masses of proton and electron |
|
(d) The ratio of the masses of electron and proton |
A combination of two thin lenses of the same material with focal lengths 
and 
, arranged on a common axis minimizes chromatic aberration, if the distance between them is
|
(a) |
(b) |
(c) ( |
(d) |
