8.0cm
16.0cm
24.0cm
32.0cm
Correct answer is D
F = 12cm, V = 3u
F = \(\frac{uv}{u + v}\)
12 = \(\frac{u\times 3u}{u + 3v}\)
u = 16cm, and v = 48cm
therefore, distance between u and v
v = 48 - 16 = 32cm
Which of the following is true of sounds?
sound travels faster in air at 20oC than at 30oC
the frequency of a given sound wave changes when it crosses the boundary seperating two media
the wavelength of a given sound wave in air decreases as the temperature increases
sound waves cannot be reflected
Correct answer is C
No explanation has been provided for this answer.
1 : 4
4 : 1
1 : 1
2 : 1
Correct answer is C
\(\theta\)p = 2\(\theta\)q
mq = 2mp
Cp X mp X \(\theta\)p = Cq x mq x \(\theta\)q
\(\frac {C_pm_q\theta q}{C_qm_p \theta q}\) = \(\frac {\theta q \times 2mp}{2 \theta qmp}\)
\(\frac {C_p}{Cq}\) = \(\frac {2}{2}\)
150cm3
273cm3
327cm3
600cm3
Correct answer is C
\(\frac{V_1}{T_1}\) = \(\frac{V_2}{T_2}\)
\(\frac{300}{27 + 273}\) = \(\frac{V_2}{54 + 273}\)
V2 = 327cm3
Which of the following properties makes metals ideal for cooking utensils?
high coefficient of expansion
good conduction of heat
low specific heat capacity
poor radiation of heat
Correct answer is B
No explanation has been provided for this answer.