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.
9.0kjkg\(^{-1}\)
84.0kjkg\(^{-1}\)
134.0kjkg\(^{-1}\)
168.0kjkg\(^{-1}\)
Correct answer is C
Heat involved (H) = 88,000J, Mass(M)= 0.5kg, specific heat capacity of water(C) = 4200JkgºC,
Specific latent heat of fusion(L) = ?, Temperature change(Δθ) = θ2 - θ1 = (10 - 0)° = 10°
H = MCΔθ + ML
or
H = M(CΔθ + L) -->\(\frac{H}{M}\) = CΔθ + L
: L = \(\frac{H}{M}\) - CΔθ = \(\frac{88,000}{0.5}\) - 4200 \(\times\) 10
L = 176,000 - 42000 = 134,000
L = 134,000 or 134kj/kg
46.0 Nm\(^{-2}\)
75.0 Nm\(^{-2}\)
80.0 Nm\(^{-2}\)
85.3 Nm\(^{-2}\)
Correct answer is B
Using \(\frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}}\)
P\(_{1}\) = 80Nm\(^{2}\)
T\(_{1}\) = 47 + 273 = 320k
T\(_{2}\) = 27 + 273 = 300k
P\(_{2}\)?
\(\therefore\) = P\(_{2}\) = \(\frac{P_{1}T_{2}}{T_{1}}\)
= \(\frac{80 \times 300}{320}\) = 75.Nm\(^{2}\)
Which of the following is not correct about the molecules of a substance in a gaseous state. They?
are in a constant state of motion
have different speeds
have a temperature which is measured by the average kinetic energy
The collision between the gases is perfectly inelastic
Correct answer is D
The collision between the gases is perfectly elastic
The motion of a body is simple harmonic if the?
acceleration is always directed towards a fixed point
path of motion is a straight line
acceleration is proportional to the square of the distance from a fixed point
acceleration is constant and directed towards a fixed point
Correct answer is A
In simple harmonic motion, the acceleration of the particle is directed towards its mean position and directly proportional to its displacement
0.2ms\(^{-1}\)
0.5ms\(^{-1}\)
5.0ms\(^{-1}\)
5.5ms\(^{-1}\)
Correct answer is C
Using; m\(_{1}\) u\(_{1}\) + m\(_{2}\) u\(_{2}\) = (m\(_{1}\) + m\(_{2}\))v
m\(_{1}\) = 0.5kg, u\(_{1}\) = 10ms\(^{1}\), m\(_{2}\) = 0.5kg, u\(_{1}\) = 0
\(\therefore\) (0.5kg x 10) + (0.5 x 0) = (0.5 + 0.5)v
v = 5ms\(^{1}\)