$\text{v}_0=0,\ \text{a}_0=0$
$\text{v}_0=0,\ \text{a}_0\neq0$
$\text{v}_0\neq0,\ \text{a}_0=0$
$\text{v}_0\neq0,\ \text{a}_0\neq0$
Explanation:
If a non-zero external force acts on a system of particles, it causes the centre of mass of the system to accelerate with acceleration a0 at any instant t. In such a case, the velocity of centre of mass of the system of particles is either v0 or zero.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$1:1$
$1:2$
$\pi:2$
$2:\pi$
Rest mass energy of an electron is 0.51 MeV. If this electron is moving with a velocity 0.8 c (where c is velocity of light in vacuum), then kinetic energy of the electron should be.
|
(a) 0.28 MeV |
(b) 0.34 MeV |
(c) 0.39 MeV |
(d) 0.46 MeV |
You are given a resistance wire of length 50 cm and a battery of negligible resistance. In which of the following cases is largest amount of heat generated
|
(a) When the wire is connected to the battery directly |
|
(b) When the wire is divided into two parts and both the parts connected to the battery in parallel |
|
(c) When the wire is divided into four parts and all the four connected to the battery in parallel |
|
(d) When only half the wire is connected to the battery |
A truth table is given below. Which of the following has this type of truth table
|
A |
0 |
1 |
0 |
1 |
|
B |
0 |
0 |
1 |
1 |
|
y |
1 |
0 |
0 |
0 |
|
(a) XOR gate |
(b) NOR gate |
(c) AND gate |
(d) OR gate |
For ferromagnetic material, the relative permeability (
, versus magnetic intensity (H) has the following shape
|
(a)
|
(b)
|
(c)
|
(d)
|
If the radioactive decay constant of radium is 1.07 
per year, then its half life period is approximately equal to
|
(a) 8,900 years |
(b) 7,000 years |
(c) 6,476 years |
(d) 2,520 years |
What will be the angle of diffracting for the first minimum due to Fraunhoffer diffraction with sources of light of wave length 550 nm and slit of width 0.55 mm
|
(a) 0.001 rad |
(b) 0.01 rad |
(c) 1 rad |
(d) 0.1 rad |
