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A point charge of 8.40 mC is surrounded by an equipotential surface with a radius of 0.262 m. What is the electric potential on the surface?
A freshly prepared sample of a certain radioactive isotope has an activity of 10.0 mCi. After 4.50 h, the activity is 7.80 mCi. Find the decay constant and half-life of the isotope
On a cold day, 16000 J of heat leaks out of a house. The inside temperature is 20.0° C, What is the increase in the entropy of the universe
An atom (not a hydrogen atom) absorbs a photon whose associated wavelength is 281 nm, How much net energy (in terms of eV) is absorbed by the atom
Two poles, one of which is 5 times as strong as the other, exert on each other a force equal to 0.8x10^-3 kgf, Find the strength of each pole
A nearsighted person wears glasses to correct the problem. How far in cm from the eyes is the person's far point located
You have a small electromagnet that consumes 350 W from a residential circuit delivering 110 V at 60.0 Hz. What is the inductance of the electromagnet
The cross-sectional area of region A in the pipe is 1.05m^2, and the cross-sectional area of region B in the pipe is 0.740m^2. What is the speed of the water in region A of the pipe
A 0.150 kg ball is going around in a vertical circle of radius R = 0.300 m at constant speed v. The ball is attached to a mass less ideal string which is attached to a fixed pivot point. If the tension F in the string is greater than 125 N, the st..
1. starting from rest a proton falls through a potential difference of 2700 v. what speed does it acquire?2. a long
The ferromagnet gadolinium has a Curie temperature of 298 K and each atom has J=7/2 and g=2. Find the value of the molecular field at low temperatures
Visible light passes through a diffraction grating that has 900 slits per centimeter, and the interference pattern is observed on a screen that is 2.56 m from the grating. In the first-order spectrum, maxima for two different wavelengths are separ..
A baseball (m = 155 g) approaches a bat horizontally at the speed of 40.5 m/s (91 mi/h) and is hit straight back at a speed of 45.5 m/s (102 mi/h).
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