Physics Questions and Answers

The sensitivity of a thermometer is defined as the smallest temperature change that can be detected or measured, NOT how quickly that temperature change can be detected.

In contrast, the difference between the maximum and the minimum temperature is the range of a thermometer

density (ρ) = 13600 $kgm^{-3}$; g =$9.8 ms^{-2}$

$P_{atm}$ =101,325 Pa;  ρ=13600 $kgm^{-3}$


Pabs=$P_{atm}$+ρgh

⇒Pabs=101,325+13600 x 9.8 x 0.25
 

⇒Pabs=101,325+33320

⇒ Pabs=134,645Pa

$n_1$=1.33; $n_2$=1.5;  i=40°; r= ?

from snell's law:

$n_1$ x sin i=$n_2$x sin r

⇒1.33 x sin 40°=1.5 x sin r

⇒sin r = 0.5700

⇒r = $sin^{-1}$ (0.5700)

 ⇒ r = 34.75

The work done against the gravitational force is calculated using the formula W = mgh, where m is the mass of the object, g is the acceleration due to gravity (approximately $9.8 ms^2$ on Earth), and h is the height. Substituting the given values, we get W = 3.0 kg * $9.8 m/s^2$ * 240 m = 7.2 kJ. Therefore, the correct answer is '7.2 kJ'.

Let mb=mass of empty bottle,

$m_w$=mass of water only and

$m_a$= mass of alcohol only
 

given; $m_b$=19g



$m_b$ + $m_w$ = 66g

$m_b$ + $m_a$ = ?

R.d=0.8

R.d=mass of alcohol

⇒$\frac{mass of alcohol}{mass of equal volume of water}$

⇒ mass of equal volume of water = $m_w$=66-19=47g

⇒0.8 = $\frac{m_a}{47}$

⇒$m_a$=0.8×47 =37.6g

; $m_b$ + $m_a$ = 19+37.6=56.6g