Which is NOT one of the laws of solid friction?
The frictional force between two surfaces opposes their relative motion
The ratio of frictional force to the normal reaction varies for two given surfaces
The ratio of frictional force to the normal reaction is constant for two given surfaces
The limiting frictional force is independent of the area of surface in contact.
Dynamic frictional force is independent of the relative velocity of the surfaces in contact.
Correct answer is B
No explanation has been provided for this answer.
1.60 × 10-19N
3.84 × 1019N
1.92 × 10-14N
3.84 × 10-14N
7.68 × 10-14N
Correct answer is D
No explanation has been provided for this answer.
Which statement is TRUE of a block of stone of mass m, with zero momentum?
The acceleration of the stone is non-uniform
The stone is stationary
The stone moves at a constant velocity
The stone moves with maximum velocity
The stone moves with minimum velocity.
Correct answer is B
No explanation has been provided for this answer.
The falling of light energy on a metal such that electrons are liberated from the metal is called
electron effect
metal electron effect
metal emission
photoelectric effect
photoemission
Correct answer is E
No explanation has been provided for this answer.