A bicycle pump contains air at one atmosphere and 0°C. As the tire is pumped up, the volume of air decreases by 50% with each stroke. What is the new pressure of air (in atm) in the chamber after the first stroke, assuming no temperature change?
A. 2
B. 1
C. 0.5
D. 0.1
E. 3
Answer: A
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General Questions: A box is placed on a table which rests on the floor. The box pushes on the table; the reaction force to the box's push on the table is the table's push on the floor.
A. True B. False
Which of the following best explains the phenomenon of black hole evaporation?
A) Due to high temperatures in the accretion disk around a black hole, material evaporates from the black hole like water evaporating from the ocean. B) Particles (or antiparticles) are occasionally ejected from within the event horizon, causing the black hole to lose mass. C) Particles (or antiparticles) are created by a quantum mechanical effect near, but outside, the event horizon of the black hole. The law of conservation of energy maintains that the black hole must lose energy to "pay" for the creation of this mass. D) Virtual particles created near the black hole are constantly annihilating each other, causing a very high temperature even if the black hole has no accretion disk. This high temperature provides escape velocity for the virtual particles, causing the entire "cloud" of virtual particles to expand away into space. E) Black hole evaporation is a virtual process, meaning that it has been theorized by astrophysicists but doesn't really occur.
Briefly explain the purpose of the equation
Number of Civilizations = NHP × flife × fcivilization × fnow. What will be an ideal response?
Specific heat capacity of ice = 2,000 J/kg-°C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-°C As the ice is melting, the temperature of the ice-water mixture rises by __________
Fill in the blank(s) with correct word