Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
87N
73.5N
133.3N
533.2N
Correct answer is C
V. R = \(\frac{1}{Sinθ}\)
m = 20kg
V.R = \(\frac{1}{Sin 30}\)
= 2
Efficiency = 75%
Load = mg
= 20 x 10 = 200N
Efficiency = \(\frac{M.A}{V.R} \times 100\)
75/100 = \(\frac{M.A}{2}\)
M .A = \(\frac{75 \times 2}{100}\)
M. A = 1.5
Since M. A. = \(\frac{\text{Load}}{\text{Force}}\)
Force = \(\frac{200}{1.5}\)
= 133.3N
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