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Vinamratha
Subject: Physics
, asked on 21/1/18
a wire of diameter 2 cm breaks if the tension in it increases to 250 newton . find maximum tension which can be given to a similar wire of diameter 4 cm
Answer
1
Yayati
Subject: Physics
, asked on 12/1/18
Solve this:
Answer
1
Avika .
Subject: Physics
, asked on 11/1/18
The resistance of resistance thermometer at 19 degree celsius is 35 ohm and 99 degree celsius is 3.66 ohm at what temperature will the resistance Be 1.30 . please don't send any link and don't copy the answer from previous one
Answer
1
Avika .
Subject: Physics
, asked on 9/1/18
at constant volume Gas thermometer using sulphur records pressure of 2*10 ^4Pascal at triple point of water and 2.87 *ten^ 4 pascals at temperature of melting sulphur. calculate the melting point of sulphur.
Answer
1
Avika .
Subject: Physics
, asked on 9/1/18
The resistance of a resistance thermometer at 19 degree celsius is 35 ohm and at 99 degree celsius is 3.660 . At what temperature will resistance be 1.30 Ohm.
Answer
1
Raj Aryan
Subject: Physics
, asked on 8/1/18
Plz answer quickly!
Q5. Two rods of different materials with coefficients of thermal expansion
α
1
&
α
2
respectively; Young's moduli Y
1
& Y
2
respectively ; of initial lengths
l
1
&
l
2
respectively of equal cross- sectional areas are joined at one end. The free ends are fixed to two vertical walls as shown in figure.
Temperature of the surrounding is then increased by T°C. Find out the displacement of the joint of the rods.
Answer
1
S O N A L I
Subject: Physics
, asked on 6/1/18
On Reaumur scale of temperature the melting of ice and boiling point of water are taken as 0 degree R and 80 degree R respectively. The freezing and boiling point of mercury on Celsius scale is taken as 39 degree C and 367 degree C respectively. Express these temp in reaumur scale
Answer
1
Priyansh
Subject: Physics
, asked on 6/1/18
10 The formation of ice is started in a lake with water at 0
°
C when the atmospheric temperature is -10
°
C. If time taken for 1 cm of ice to be formed is 7 hours, the time taken for the thickness of ice to increase from 1 cm to 2 cm is
1. less than 7 hours
2. 7 hours
3. more than 14 hours
4. more than 7 hours but less than 14 hours
Answer
1
Priyansh
Subject: Physics
, asked on 6/1/18
4. A body cools in 7 minutes from 60
°
C to 40
°
C. What will be its temperature after the next 7 minutes? The temperature of surrounding is 10
°
C.
Answer
2
Rajarshi Das
Subject: Physics
, asked on 3/1/18
explain conduction, Convection and radiation with examples.
Answer
1
Rajarshi Das
Subject: Physics
, asked on 3/1/18
what is Anomalous expansion of water and explain the significance of it
Answer
1
Rajarshi Das
Subject: Physics
, asked on 3/1/18
define coefficient of linear, area and volume expansions.derive the relation between them
Answer
1
Naga Nandhini
Subject: Physics
, asked on 31/12/17
Derive the dimensional formulas for specific heat capacity,heat capacity and molar specific heat capacity
Answer
1
Shreya Choudhary
Subject: Physics
, asked on 29/12/17
II)The viscosity of fluids slows naturally convection near a stationary surface, giving a surface film that or a vertical surface typically has about the same insulating value as 1.3cm of plywood(R value=0.7).Formed convection decreases the thickness of this film, increasing the rate of heat transfer.This is the reason for the "wind chill factor", you get cold faster in a cold wind than in still air with the same temperature.
Answer
1
Naga Nandhini
Subject: Physics
, asked on 28/12/17
Q. Concrete roof gets warm during summer. Therefore, a layer of hay (bad conductor) forms an insulating layer and the heat transfer through the celling into the roof is prohibited. Expalin.
Answer
1
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Q5. Two rods of different materials with coefficients of thermal expansion respectively; Young's moduli Y1 & Y2 respectively ; of initial lengths respectively of equal cross- sectional areas are joined at one end. The free ends are fixed to two vertical walls as shown in figure.
Temperature of the surrounding is then increased by T°C. Find out the displacement of the joint of the rods.
1. less than 7 hours
2. 7 hours
3. more than 14 hours
4. more than 7 hours but less than 14 hours
Q. Concrete roof gets warm during summer. Therefore, a layer of hay (bad conductor) forms an insulating layer and the heat transfer through the celling into the roof is prohibited. Expalin.