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The size of an atom is approximately 10-8cm. to locate an electron within the atom, one should use electromagnetic radiation of wavelength not longer than, say, 10-9cm
a) what is the energy of a photon with such a wavelength (in ev)?
b) what is the uncertainty in the electron's momentum if we are certain about its position by 10-9cm?
A battery having an emf of 9.80 V delivers 109 mA when connected to a 60.0 load. Determine the internal resistance of the battery
Follow that with some of her work on repressed memories. After completing your readings on the WebLink, the textbook, and the PowerPoint presentation, address the prompts for your assignment.
A farsighted person can read printing as close as 25.0 cm when she wears contacts that have a focal length of 37.4 cm. What is the maximum angular magnification that the magnifying glass can provide for her
A lamp (R = 148 ), an electric heater (R = 23 ), and a fan (R = 48 ) are connected in parallel across a 117 V line. What is the voltage across the fan
a block of wood has specific gravity 0.79. When placed in water, what percent of the volume of the wood is under the surface. And what volume of the wood is above the surface
Three resistors, 28, 48, and 80 ?, are connected in series, and a 0.53-A current passes through them. What is the potential difference across the three resistors
Determine the flux of particles escaping from the exobase of Earth's atmosphere using a number density at the exobase of 10^5 particles/cm^3 and a temperature of 700K.
A softball having a mass of 0.255 kg is pitched at 92.3 km/hr. By the time it reaches the plate, estimate the average force of air resistance during a pitch
A 0.04-kg baseball traveling in a horizontal direction with a speed of 16 m/s hits a bat and is popped straight up with a speed of 15 m/s. what was the average force of the bat on the ball
Ice of mass 52.0 g at -10.6° C is added to 188 g of water at 14.5° C in a 102 g glass container of specific heat 0.200 cal/g-°C at an initial temperature of 23.3° C
A 1625 kg car, having run out of gas, is at rest on a level surface. If the person applies a force of 765 kg m/s^2 for 8 seconds, how much work did he do on the car
Two equal charges of magnitude +1 C are separated by a distance of 1 km. What is the force acting between these two charges
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