+91-87964 74404
FlagBACK
Question icon
Grade 9Thermal Physics

An Aluminium bar is found to measure 50cm at 20°C when measured with brass scale correct at 0°C . what is the true length of the bar at 20 °C?

Profile image of Koech peter
7 Years agoGrade 9
Answers icon

1 Answer

Profile image of Shubhangi Shilendra
7 Years ago
When temperature increases, length of obj observed by scale is less than correct length.
hence true value at measured temperature 20 degrees Celsius is
Lt= true value of length. Lm= length measured at 20 degrees celsius
a= linear coefficient of exp of brass= 18x10^-6
Lt= Lm+ (Lm x a x change in temperature)
   =20 + (20 x 18 x 10^-6 x 20)
   = 20 + (72 x 10^-4)
   =20.0072cm
 

Other Related Questions on thermal physics

question mark
A container filled with a sample of an Idea gas at the pressure of 1.5atm. the gas is compressed isothermal ly to one fourth of its original volume. What is the new pressure of the gas?
 
thermal physics
1 Answer Available

Last Activity: 3 Years ago

question mark
how do we know the electric field due to an electric dipole of dipole moment P at distance r from the centre of dipole is fiven by .. where theta is angle between p amd r vector..
thermal physics
1 Answer Available

Last Activity: 4 Years ago

question mark
A A mole of helium gas initially at stp undergoes an isovolumetric process in which its pressure falls to half its initial value. The work done by gas is
 
thermal physics
1 Answer Available

Last Activity: 4 Years ago

question mark
  1. 5000 J of heat are added to two moles of an ideal monatomic gas, initially at a temperature of 500 K, while the gas performs 7500 J of work. What is the final temperature of the gas? step by step please
thermal physics
1 Answer Available

Last Activity: 4 Years ago

question mark
Please help me with the  answer of this question  related to radiation graph
thermal physics
1 Answer Available

Last Activity: 4 Years ago