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A radioactive sample S1 having an activity of 5 muCi has twice the number of nuclei as another sample S2 which has an activity of 10 muCi. Find the ratio of the half lives of S1 and S2.
20
Oct
A radioactive sample S1 having an activity of 5 muCi has twice the number of nuclei as another sample S2 which has an activity of 10 muCi. Find the ratio of the half lives of S1 and S2. A radioactive sample S1 having an activity of 5 muCi has twice the number of nuclei as [...]
Loop A of radius r << R moves toward loop B with a constant velocity V in such a way that their planes are always parallel. what is the the distance between the two loops ( x ) when the induced emf in loop A is maximum ?
20
Oct
Loop A of radius r << R moves toward loop B with a constant velocity V in such a way that their planes are always parallel. what is the the distance between the two loops ( x ) when the induced emf in loop A is maximum ? the current in wire AB is ( [...]
A man M1 of mass 80kg runs up a staircase in 15s. Another man M2 also of mass 80kg runs up the same staircase in 20s. The ratio of the power development by then will be:
20
Oct
A man M1 of mass 80kg runs up a staircase in 15s. Another man M2 also of mass 80kg runs up the same staircase in 20s. The ratio of the power development by then will be: A man M1 of mass 80kg runs up a staircase in 15s. Another man M2 also of mass 80kg [...]
A block of mass `m` is projected on a smooth horizontal circular track with velocity v what is the average normal force exerted by the circular walls on the block during motion A to B?
20
Oct
A block of mass `m` is projected on a smooth horizontal circular track with velocity v what is the average normal force exerted by the circular walls on the block during motion A to B? A block of mass `m` is projected on a smooth horizontal circular track with velocity v what is the average [...]
A car travels with constant speed on a circular road level ground in figure Fair is the force of air resistance acts opposite to the motion of car which of the other forces shown best represents the horizontal force of the road on the car’s tires?
20
Oct
A car travels with constant speed on a circular road level ground in figure Fair is the force of air resistance acts opposite to the motion of car which of the other forces shown best represents the horizontal force of the road on the car’s tires? as shown .If F1 is removed F2=2N Figure shown [...]
A particle is projected with a speed v0 = gR−−−√. The coefficient of friction the particle and the hemi- spherical plane is μ=0.5 Then , the acceleration of the particle is
20
Oct
A particle is projected with a speed v0 = gR−−−√. The coefficient of friction the particle and the hemi- spherical plane is μ=0.5 Then , the acceleration of the particle is A particle is projected with a speed v0 = gR−−−√. The coefficient of friction the particle and the hemi- spherical plane is μ=0.5 Then [...]
Two identical particles are attached at the end of a light string which passes through a hole at the center of a table One of the particle is made to move in a circle on a table with angular velocity ω1 and the other is made a move is a horizontal ω2 if l1and l2 are the length the table , than in order that particle under down the table neither moves down nor move up the ratiol1/l2 is
20
Oct
Two identical particles are attached at the end of a light string which passes through a hole at the center of a table One of the particle is made to move in a circle on a table with angular velocity ω1 and the other is made a move is a horizontal ω2 if l1and l2 [...]
Three identical particles are joined together by a thread as shown in figure All the particles are moving in a horizontal plane If the vertical of the outermost particle is `v_(0)` then the ratio of tension in the three sections of the string `(T_(1):T_(2):T_(3) = ?)` is
20
Oct
Three identical particles are joined together by a thread as shown in figure All the particles are moving in a horizontal plane If the vertical of the outermost particle is `v_(0)` then the ratio of tension in the three sections of the string `(T_(1):T_(2):T_(3) = ?)` is as shown .If F1 is removed F2=2N Figure [...]
When the string of a conical pendulum makes an angle of 45^∘ with the vertical , its time is T1 when the string makes an angle of 60^∘ with the vertical , its time period is T2 then T^21/T^22is
20
Oct
When the string of a conical pendulum makes an angle of 45^∘ with the vertical , its time is T1 when the string makes an angle of 60^∘ with the vertical , its time period is T2 then T^21/T^22is its time is T1 when the string makes an angle of 60^∘ with the vertical its [...]
A freshly prepared radioactive sources of half-life 2 h emits radiation of intensity which is 64 times the permissible safe level. Find the minimum time (in hrs) after which it would
20
Oct
A freshly prepared radioactive sources of half-life 2 h emits radiation of intensity which is 64 times the permissible safe level. Find the minimum time (in hrs) after which it would A freshly prepared radioactive sources of half-life 2 h emits radiation of intensity which is 64 times the permissible safe level. Find the minimum [...]