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Two moles of ideal helium gas are in a rubber balloon at 30ºC. The balloon is fully expandable and can be assumed to require no energy in its expansion. The temperature of the gas in the balloon is slowly changed to 35ºC. The amount of heat required in raising the temperature is nearly (take R = 8.31 J/mol.K) -jee main 2012 physics 1 AnswerExplain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon? cbse-class8-physics-20151 AnswerAn inflated balloon was pressed against a wall after it has been rubbed with a piece of synthetic cloth. It was found that the balloon sticks to the wall. What force might be responsible for the attraction between the balloon and the wall? cbse-class8-physics-20151 AnswerAir at 150 kPa and 323 K is filled in a rigid vessel of 0.05 m3 capacity. For air, assumed as an ideal gas, specific heat at constant volume is 0.7163 kJ/kg.K and the specific gas constant is 0.287 kJ/kg.K. Neglect kinetic and potential energy changes. If 30 kJ of heat is added, the final temperature (in K) of air (up to 1 decimal place) is __________.0 AnswerT wo moles of an ideal gas X and two moles of an ideal gas Y, initially at the same temperature and pressure, are mixed under isothermal-isobaric condition. The entropy change on mixing is __________J K–1. (Up to one decimal place. Use R = 8.31 J K–1 mol–1)0 AnswerWhich of the following cannot be charged easily by friction? cbse-class8-physics-20151 AnswerAn ideal Otto cycle (O) and an ideal diesel cycle (D) have the same maximum temperature and reject equal amount of heat. Also, the working fluid enters at the same state before compression. One of the following statements always true about their efficiencies (𝜂) is1 AnswerA ir enters into an engine cylinder at a pressure of 100 kPa and temperature of 300 K in the suction stroke of an ideal Otto cycle. The cylinder clearance volume is 600 cm^3 and compression ratio is 8:1. The expansion stroke of the cycle is polytropic in nature. The pressure at the beginning of the expansion stroke is 10 MPa and the temperature at the end of the expansion stroke is 1800 K. The polytropic exponent of the expansion stroke is ________. (GATE-Agricultural-Engineering-2018)0 AnswerA mbient air at 30◦C dry bulb temperature and 80% relative humidity was heated to a dry bulb temperature of 80◦C in a heat exchanger by indirect heating. The amount of moisture gain (g kg-1 dry air) during the process would be _______.0 AnswerAn air-conditioner maintains the room temperature at 27 oC while the outside temperature is 47 oC. The heat conducted through the walls of the room from outside to inside due to temperature difference is 7000 W. The minimum work done by the compressor of the air-conditioner per unit time is ________ W0 AnswerA n insulated storage tank contains 1000 kg liquid of specific heat 10 kJ kg-1 K-1. The liquid is heated by saturated steam, condensing in a helical coil at a temperature of 180 oC. The heat transfer area of the coil is 0.1 m2. If the overall heat transfer coefficient is constant at 1000 W m-2 K-1, then the time (in hours) required to raise the temperature of the liquid in the tank from 20 oC to 80 oC is ____________ (rounded off to second decimal place).0 AnswerTwo solid spheres A and B have same emissivity. The radius of A is four times the radius of B, and temperature of A is twice the temperature of B. The ratio of the rate of heat radiated from A to that from B is ________.1 AnswerT he humidity of air at a dry-bulb temperature of 65 oC is 0.025 kg water/kg dry air. The latent heat of vaporization of water at 0 oC is 2500 kJ/kg. The psychrometric ratio of air is 0.95 kJ (kg dry air)-1 K-1. Considering 0 oC as reference temperature, the enthalpy of air (in kJ/kg) at its adiabatic saturation temperature of 35 oC is ___________ (rounded off to two decimal places).0 Answer 5.6 liter of helium gas at STP is adiabatically compressed to 0.7 liter. Taking the initial temperature to be T1, the work done in the process is - jee main 2012 physics 1 AnswerThe amount of heat absorbed or given out depends on (NIFT)1 AnswerThe internal energy of an ideal gas is a function of Gate-20161 AnswerT he rate of heat transfer from a metal plate is 1000 W m-2. The surface temperature of the plate is 120◦C and ambient temperature is 20◦C. The convective heat transfer coefficient (W m-2 ◦C-1) using the Newton’s law of cooling will be _______.0 AnswerMilk enters into the heating section of a high temperature short time (HTST) pasteurizati on plant at a temperature of 45ºC and leaves at 72 ºC. Hot water at temperature of 95 ºC enters counter - currently into the heat exchanger 1 AnswerAnswer the question with the help of the passage (GMAT) 1 AnswerA reversible cycle receives 40 kJ of heat from one heat source at a temperature of 127 C and 37 kJ from another heat source at 97 C. The heat rejected (in kJ) to the heat sink at 47 C is __________ Gate-20161 Answer
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Two moles of ideal helium gas are in a rubber balloon at 30ºC. The balloon is fully expandable and can be assumed to require no energy in its expansion. The temperature of the gas in the balloon is slowly changed to 35ºC. The amount of heat required in raising the temperature is nearly (take R = 8.31 J/mol.K) -jee main 2012 physics
(A) 62 J (B) 104 J (C) 124 J (D) 208 JCan you help us to add better answer here? Please see this
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