0.8Ns
1.2Ns
12.0Ns
80.0Ns
Correct answer is B
Momentum = Mass x Velocity
Change in Momentum = Mass x (change in velocity)
Change in Momentum = Mass x (v - u)
Mass = 100g = 0.1kg
U = 2ms\(^{-1}\)
V = 10ms\(^{-1}\)
Change in momentum = m (v − u)
= 0.1 (2 -(- 10))
= 0.1 (12)
= 1.2Ns
The force between the molecules of a liquid in contact with that of a solid is?
Adhesive
Cohesive
Magnetic
Repulsive
Correct answer is A
The term Adhesive forces refers to the attractive forces between unlike substance
0kgm
2kgm/s
4kgm/s
8kgm/s
Correct answer is D
Initial momentum = (0.8) × (5)
= 4.0kgms\(^{-1}\)
Final momentum
= (0.8) × (– 5)
= – 4.0kgms\(^{-1}\)
Impulse on ball
= Change in momentum
= 4.0 – (– 4.0)
= 8.0.0kgms\(^{-1}\)
When an atom loses or gain a charge it becomes
An electron
An ion
A neutron
A proton
Correct answer is B
If an atom gains or loses an electron, it becomes an ion. An atom that gains a negative electron, it becomes a negative ion. If it loses an electron it becomes a positive ion
36.0
7.2
5.0
3.6
Correct answer is D
Mechanical Advantage = V.R × Efficiency
= 5 × 0.72
= 3.6