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A sample of a radioactive isotope has an initial activity (at time t = 0) of 0.500 mCi. At time t = 51.2 d the activity is 0.387 mCi. Compute the half-life of this isotope.
If a circuit has two resistors in a parallel series with resistances 4.0 kΩ and 2.0 kΩ and has two capacitors with capacities 3.0 μF and 6.0 μF and the capacitors begin to charge then what is the time constant for the charging process?
Electric eels generate electric pulses along their skin that can be used to stun an enemy when they come into contact with it, How much energy is delivered to the unfortunate enemy with a single pulse, assuming a steady current
Two converging lenses, each of focal length 16.5 cm, are placed 39.8 cm apart, and an object is placed 30.0 cm infront of the first lens. Where is the final image formed?
A cheetah is traveling across the African countryside, initially moving at a constant velocity of 15 m/s. What is the average acceleration of the cheetah from t = 0 to t = 4.0 seconds
The resolving power of a microscope depends on the wavelength utilized. If one wished to "see" a particular type of molecule, a resolution of 1.2*10-10 m would be required.
a football is punted with an initial velocity of 26.1 ms and an initial angle of 53.1o. what is its hang time the time
You are watching an object that is moving in SHM. How much farther from this point will the object move before it stops momentarily and then starts to move back to the left
An engine absorbs 1.68 kJ from a hot reservoir at 277°C and expels 1.23 kJ to a cold reservoir at 27°C in each cycle. How much work is done by the engine in each cycle
An object of mass 2 kg and charge 40 microC is moving with initial speed of 5 m/s towards a fixed point charge of 30 microC which is fixed. Find the position of the object when it comes to rest
a student playing tetherball hits the ball so it moves in acircle around the central pole. What is the new angle of the ball if he hits the ball at the same tangential speed
A golf ball of mass 0.050 kg is at rest on the tee and has a velocity of 102 m/s immediately after being struck. what was the club velocity before the collision
a student sits on a freely rotating stool holding two weights each of mass 3.09 kg. when his arms are extended
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