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Polymers, like rubber, are made of very long molecules, usually tangled up. Another very crude model of a rubber band is that each link
Find the maximum wavelength of the photon that a hydrogen atom in its ground state must absorb in order for the ionization to occur.
Assume that the human body is 75% water. How many moles of water are in your body? How many molecules?
The chlorophyll-a molecule, C55H72MgN4O5, is important in photosynthesis.
The carbon monoxide molecule (CO) consists of a carbon atom and an oxygen atom separated by a distance of 1.13 * 10^-10 m. The mass of mc = 0.750 mo
Water is used as the moderator in a PWR. Calculate the mean free path of a thermal neutron in water given that the absorption cross section for thermal neutrons
Take a clear balloon. Add one BB and blow up the balloon to about the size of a softball, then tie it off.
A Ni-Cu alloy is prepared which has a lattice constant of 0.354 nm. The maximum magnetisation of the alloy is measured as 1.25*10^6 A/m.
We have at our disposal an amount of energy equaling 3.5 kJ and we wish to allocate it in 1 mole of gas which occupies volume V
Use the following working values for the physical constants:
What is the difference between an atom and an ion? Provide an example.
A fisherman catches two striped bass. The smaller of the two has a measured length of 93.46 cm(two decimal places, four significant figures)
Discuss briefly the origin of the differing electronic properties of metals, semiconductors and insulators.
An approximation for the potential energy of a KCl molecule is U=A[(R^7/8r^8)-(1/r)], where R=2.67*10^-10m and A=2.31*10^-28J*m.
Streamlines represent the path of the flow of a fluid. You can imagine that they represent a time-exposure photograph that shows the paths
A water molecule can vibrate in various ways, but the easiest type of vibration to excite is the "flexing" mode in which the hydrogen atoms
Positronium is an atom composed of an electron and a positron (mp = me, Q = +e). Calculate the distance between the particles and the energy
An atom of mass m moving in the x direction with speed v collides elastically with an atom of mass 3m at rest.
Three coplanar forces act on a 75000.0 kg object in outer space, where there is no gravity: 14.2 kN directed at 357°, 25.6 kN at 138°, and 16.4 kN at 255°.
A uniform spherical planet has mass M= 8.5 E 25 kg and radius R= 7.5 E 6 m.
Assume the earth to be a uniform spherical planet, mass M= (5.98 E 24) kg. (The number, in scientific notation, means '5.98 times 10 to the 24')
Imagine that you have a solid cube composed of Material X. You put the cube into a beaker filled with water. The cube sinks to the bottom of the beaker
Calculate the true weight effects of a supine leg press, standing squat, and bench press in supine.
Water drops are falling from the roof of the building 16 m tall through equal time intervals. When the first drop reaches the ground, the fifth one is leaving
A 227-kg block of cement, of density 2.8 x 10^3 kg/m^3, rests on a pedestal in front of the Al Capone Memorial Library.