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Please explain Planck's hypothesis and Bohr's model and how these ideas shaped our modern understanding of the structure of the atom.
Two small plastic spheres, one charged to 17nC and the other to -17nC are connected by a 25 mm long insulating rod, What is the maximum possible torque on the dipole
a boy is laying on a sled wich is on an ice covered hillinclined at an anlge of 15 degrees if the boy, what is the force pulling them down the hill
How long does it take for amplitude to drop to half its initial value . How long does it take for mechanical energy to drop to half its initial value.
Methane is compressed adiabatically from 100 kPa(abs) and 25 °C to 200 kPa(abs). What is the minimum compressor exit temperature possible? Explain.
An electomechnical vibrator is used to vibrate the string at 120 Hz. When the weight is adjusted to 285 g, the string is found to oscillate in its third standing wave mode (three loops). What is the speed of wave propogation on the string in this ..
What is the radiation pressure (force/area) of a laser pointer on a heavy, highly absorbing surface? Assume that the laser has an output power of 1mW, a wavelength of 600nm, and a beam radi- us of 1mm. To do this problem, first compute the number ..
A cylindrical cork of radius R=1.5cm height d = 0.75cm and specific gravity of 0.24 floats at an air -water interface. How far below the surface of the water is the bottom of the cork in equilibrium
if a charge particle move in a straight line and there no other forces on it except possibly from a magnetic field can
a proton moves in a constant electric field from point a to point b. the magnitude of the electric field is 6.4 times
the number of radioactive nuclei present at the state of an experiment is 2.78e15. the number present twenty days later is 5.14e14. what is the half life in days of the nuclei
A piñata of mass M = 6.7 kg is attached to a rope of negligible mass that is strung between the tops of two vertical poles. Find the tension (T) in each part of the rope due to the weight of the piñata
question1a professors office door is 0.92 wide 2.0high and 4.0 thick has a mass of 25 and pivots on frictionless
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