When a mixture of gases is placed in a container at a given temperature, the pressure in the container is equal to the sum of the pressures that the individual gases would exert if they separately occupied the entire container at the same temperature
. Given that air is basically a mixture of nitrogen, with a molecular weight of 28 g/mol, and oxygen, with a molecular weight of 32 g/mol, what must be the ratio of the mass of oxygen to the mass of nitrogen in air for air to have an effective molecular weight of 29? A) 8:21
B) 3:5
C) 5:7
D) 32:87
E) 3:7
A
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A 22.3-g bullet moving at 1 000 m/s is fired through a one-kg block of wood emerging at a speed of 100 m/s. What is the change in the kinetic energy of the bullet-block system as a result of the collision assuming the block is free to move?
a. 0 J b. 10.8 kJ c. –10.8 kJ d. 11.2 J e. 223 J
A flute behaves like a tube open at both ends. If its length is 70.0 cm, and the speed of sound is 340 m/s, what is its fundamental frequency in Hz?
a. 121 Hz c. 243 Hz b. 159 Hz d. 260 Hz
Dislocations always _____________the energy of a crystal.
Fill in the blank(s) with the appropriate word(s).
During each cycle, a thermodynamic engine takes in 4.0 J of energy, does 1.0 J of work, and expels 3.0 J of energy. What is its efficiency?
What will be an ideal response?