Multiple choice question about physics!!?
Enclosed beneath the moveable piston in the drawing is 4.8 moles of a monatomic ideal gas. The gas performs work on the piston as 2300 J of heat are added from the surroundings. During the process, the temperature of the gas decreases by 45 K. How much work does the gas perform? 3.2 × 103 J 1.4 × 103 J 6.0 × 102 J 4.0 × 102 J 5.0 × 103 J Click link for picture! http://edugen.wiley.com/edugen/courses/crs1507/art/qb/qu/c15/q7-1.png
Physics review multiple choice questions?
-30 J 1.75 x 108 J adiabatic a tire being inflated with an air pump heat rises 75% 3.5 x 105 J 8.7 x 102 J increases
Multiple choice question in physics!!!! Anyone?
Enclosed beneath the moveable piston in the drawing is 4.8 moles of a monatomic ideal gas. The gas performs work on the piston as 2300 J of heat are added from the surroundings. During the process, the temperature of the gas decreases by 45 K. How much work does the gas perform? 3.2 × 103 J 1.4 × 103 J 6.0 × 102 J 4.0 × 102 J 5.0 × 103 J click link for picture! http://edugen.wiley.com/edugen/courses/crs1507/art/qb/qu/c15/q7-1.png
Work and heat question? (multiple choice)?
deposit of work from surroundings means work is done on the system and hence is positive withdrawal of heat to surroundings means heat is released and hence it is exothermic. hence it is negative Now Δ E = w + q where q is heat absorbed or released, w is work done w is positive and q is negative (exothermic) so i think ΔE depends on magnitude of q and w
Simple physics multiple choice questions (on heat) ! please help!?
a c d b a e d b (they are also good for convection -- but that is beyond you) b e c
Multiple Choice pick 2 ! Physics ?
A wood burning stove sits in the family room of a house and there is a fire in the stove to help heat the room. Of those listed here, which mechanisms are primarily at work to heat the room. Pick the most important two of these. a. radiation b. convection c. conduction d. vaporization e. microwaves
HELP! How much heat energy would be transferred (multiple choice)?
@biire2u, This thermodynamics problem was set up to trick you about the working fluid table. The whole idea here is to teach a student about 1st law of thermodynamics, internal energy, work, enthalpy, solid state, compress liquid state,saturated liquid state, saturated state, saturated vapor state, Superheated states, and specific at each different state. If you would apply 1st law of thermodynamics to this system. Q(1-2) = U2 - U1 + PE + KE + W Q(1-2) is heat transfer added to the system from state 1 to state 2 U2 is internal energy at state 2 U1 is internal energy at state 1 PE potential energy = Kinetic Energy = Work = 0 So, Q(1-2) = U2 - U1 = (h + Pv) at state 2 - (h+Pv) at state 1 Where, U = h + Pv h = enthalpy P = Pressure v = specific volume All the value h and v can be found on STEAM TABLE and pressure = atm (assumed P = atm pressure) All these values were done by scientist experiments for years. For water, you can calculate it and get the answer Q(1-2). BUT on the other hand, the working fluid in UNKNOWN and it's not an Ideal gas. How can you calculate enthalpy and specific volume at each state? It's a trick problem and can't be solved. That explained why when solving thermodynamics problem, the 1st thing that you need to do is define your working fluid. If it's a fluid ----> use table for the data If a weird unknown fluid that does't have TABLE available on earth, don't bother to solve it because No one can solve it. If it's Ideal gas--> use Ideal gas law Pv = nRT to obtain your data
PHYSICS HELP (multiple choice)?
1. A gaseous refrigerant undergoes compression when 150 J of work is done on it. If the internal energy of the gas increases by 120 J, the amount of heat transfer is:A) 270 J B) -270 J C) 30 J D) -30 J 2. A steam engine converts 160 kg of water completely to steam. The process involves transfer of 3.6 x 108 J as heat. If steam escaping through the safety valve does 1.85 x 108 J of work against outside atmosphere, the net change in the internal energy is: A) 1.75 J B) 1.75 x 108 J C) 5.45 J D) 5.45 x 108 J 3. Energy is transferred to a gas as heat and work. If there is no change in its internal energy, the process is known as: A) isothermal B) isobaric C) adiabatic D) isovolumic 4. Which of the following processes show no work done? A) a refrigerator used to freeze water B) a tire being inflated with an air pump C) water getting boiled in a pressure cooker D) an automobile engine operating for several minutes 5. Which of the following does not change during an adiabatic process? A) temperature B) volume C) pressure D) heat 6. A refrigerator with its power on is placed in a closed room. After a long time, the temperature of the room: A) rises B) falls C) remains the same D) first rises and then falls 7. A steam engine absorbs 2 x 105 J and exhausts 1.5 x 105 J in each cycle. Its efficiency is: A) 0% B) 25% C) 75% D) 100% 8. A heat engine absorbs 3 x 105 J and exhausts 2.5 x 105 J in each cycle. How much of work is done? A) 5 x 105 J B) 3.5 x 105 J C) 5 x 104 J D) 3.5 x 104 J 9. 600 J of heat is removed from an engine during a cycle. If the engine is 31% efficient, then the energy that must be added to the engine is: A) 8.7 x 102 J B) 8.7 J C) 1.9 x 103 J D) 1.9 J 10. When ice at 0°C melts into water 0°C, its entropy: A) decreases B) increases C) remains constant D) becomes zero
Bio help lease thank you so much? ill rate u best?
1. ability to do work 2. potential 3. kinetic 4. First law 5. not sure, probly the third one 6. fire 7. disorder 8. no 9. sun 10 true