IIT-JEE
Exam
If the resultant of all the external forces acting on a system of particles is zero, then from an inertial frame,
one can surely say that
(A) linear momentum of the system does not change in time
(B) kinetic energy of the system does not change in time
(C) angular momentum of the system does not change in time
(D) potential energy of the system does not change in time
Read Solution (Total 1)
-
- it should be option (A) Because
P = linear momentum
Delta p = F *Delta t
if F = 0
therefore p does not change
- 10 years agoHelpfull: Yes(2) No(0)
IIT-JEE Other Question
A student performed the experiment of determination of focal length of a concave mirror by u – v method using an optical bench of length 1.5 meter. The focal length of the mirror used is 24 cm. The maximum error in the location of the image can be 0.2 cm. The 5 sets of (u, v) values recorded by the student (in cm) are: (42, 56), (48, 48), (60, 40), (66, 33), (78, 39). The data set(s) that cannot come from experiment and is (are) incorrectly recorded, is (are)
option
(A) (42, 56)
(B) (48, 48)
(C) (66, 33)
(D) (78, 39)
In the core of nuclear fusion reactor, the gas becomes plasma because of
(A) strong nuclear force acting between the deuterons
(B) Coulomb force acting between the deuterons
(C) Coulomb force acting between deuteron-electron pairs
(D) the high temperature maintained inside the reactor core