1 Diagram 1.1 shows a cylinder which has a air-tight piston. The area of cross-section of
the piston is 4.0 x 104 m². A load, X of mass 1.0 kg is placed on top of the piston and the
height of the air trapped in the cylinder. (Neglect the mass of piston. Take atmospheric pressure = 1.00 ~ 10% Nm?.)
(a) Based on the kinetic theory of matter,
(i) what is the cause of the pressure acting on the inner wall of the cylinder and piston?​

What would the difference of spectral lines emitted by hydrogen gas in distant galaxies which is normally found at a wavelength of 21 cm on earth, be observed at 21.1 centimeters?

The particle in a two-dimensional well is a useful model for the motion of electrons around the indole ring (3), the conjugated cycle found in the side chain of tryptophan. we may regard indole as a rectangle with sides of length 280 pm and 450 pm, with 10 electrons in the conjugated p system. as in case study 9.1, we assume that in the ground state of the molecule each quantized level is occupied by two electrons. (a) calculate the energy of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels. 9.27 electrons around the porphine ring (4), the conjugated macrocycle that forms the structural basis of the heme group and the chlorophylls. we may treat the group as a circular ring of radius 440 pm, with 20 electrons in the conjugated system moving along the perimeter of the ring. as in exercise 9.26, assume that in the ground state of the molecule quantized each level is occupied by two electrons. (a) calculate the energy and angular momentum of an electron in the highest occupied level. (b) calculate the frequency of radiation that can induce a transition between the highest occupied and lowest unoccupied levels.

Determine el momento angular de un rueda de 3000g moviendose a 10m/s con un radio de giro de 400cm