I only
II only
II and III only
III and IV only
II, III and IV only
Correct answer is B
No explanation has been provided for this answer.
Which statement is a correct consequence of the uncertainly principle?
A particle’s kinetic energy cannot be measured accurately at any time
Both momemtum and energy of a particle can be known with absolute certainly
It is possible to measure exactly both the position and momentum of a particle at the same time
The complete knowledge of the position of a particle implies the complete ignorance of its energy
The uncertainty in our knowledge of energy and the duration taken to measure it, are each less than Planck’s constant.
Correct answer is A
The Heisenberg uncertainty principle states that it is impossible to make precise measurements of both the position and momentum of a particle simultaneously
Which material is best for making a permanent magnet?
Aluminum
cobalt
copper
soft iron
steel
Correct answer is E
Permanent magnets are made from "hard" ferromagnetic materials such as alnico and ferrite
Permanent magnets are made from special alloys (ferromagnetic materials) such as iron, nickel and cobalt, several alloys of rare-earth metals and minerals such as lodestone.
When a nonmagnetic piece of steel is applied to a magnet, the atoms within it rearrange themselves in a manner that creates a permanent magnet.
s = ut+12at2
v2 = u2 + 2as
v =u + at
v = u + 2as
s = 12(u+v)t
Correct answer is D
No explanation has been provided for this answer.