A body of mass 500 gram is rotating in a vertical of radius 1 m . What is the difference in its kinetic energies at the top and the bottom of the circle ?
A
`4.9 J`
B
`19.8 J`
C
`2.8 J`
D
`-9.8 J`
Text Solution
Verified by Experts
The correct Answer is:
B
Diff .In . K.E at the bottom and at the top ` =(1)/(2) m (v_(1)^(2)-v_(2)^(2)) "But " v_(1) sqrt(5 gr ) and v_(2) = sqrt( gr)` `=(1)/(2) m ( 5 gr 0 gr) = 2 mgr = 2xx(1)/(2) xx9.8 xx1` `=9.8J`
Topper's Solved these Questions
CIRCULAR MOTION
MARVEL PUBLICATION|Exercise TEST YOUR GRASP-1|1 Videos
CIRCULAR MOTION
MARVEL PUBLICATION|Exercise TEST YOUR GRASP-2|1 Videos
ATOMS, MOLECULES AND NUCLEI
MARVEL PUBLICATION|Exercise TEST YOUR GRASP|30 Videos
COMMUNICATION SYSTEMS
MARVEL PUBLICATION|Exercise TEST YOUR GRASP -20|10 Videos
Similar Questions
Explore conceptually related problems
A body of mass 1 kg is rotating in a verticle circle of radius 1 m .What will be the difference in its kinetic energy at the top and bottom of the circle ? (g=10m//s^(2))
A body of mass 1 kg is moving in a vertical circular path of radius 1 m. The difference between the kinetic energies at its highest and lowest position is
A body is mass m is rotating in a vertical circle of radius 'r' with critical speed. The difference in its K.E at the top and at the bottom is
A body of mass m is rotating in a verticle circle of diameter '2r' with critical speed. The difference in its kinetic energy at the highest and lowest points on the verticle circle is
A body of mass 1 kg is moving in a vertical circular path of radius 1 m. The difference between the kinetic energies at its highest and lowest positions is [take g=10 m//s^2 ]
A body of mass 'm' is rotated by means of a string along a verticle of radius 'r' with constant speed .The difference in tension when the body is at the bottom and at the top of the verticle circle is
A particle of mass m is rotated in a vertical circle by means of a string . The differnce in the tensions in the string at the bottom and the top of the circle would be
MARVEL PUBLICATION-CIRCULAR MOTION-TEST YOUR GRASP-20
