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The radioactive element radium ({\rm Ra}) decays by a process known as alpha decay, in which the nucleus emits a helium nucleus. (These high-speed helium nuclei were named alpha particles when radioactivity was first discovered, long before the identity of the particles was established.) The reaction is ^{226} {\rm{{\rm Ra}}} \;\to\; ^{222} {\rm{{\rm Rn}}}\; +\; ^4 {\rm{{\rm He},}} where Rn is the element radon. The correctly measured atomic masses of the three atoms are 226.025, 222.017, and 4.003. (The energy released in radioactive decay is what makes nuclear waste "hot.")
How much energy is released in all decay?
You have a 250-? resistor and a 0.410-H inductor. Suppose you take the resistor and inductor and make a series circuit with a voltage source that has a voltage amplitude of 30.0V, What is the voltage amplitudes across the inductor
A liquid (ρ = 1.65 g/cm3) flows through twohorizontal sections of tubing joined end to end. Calculate the smaller section's pressure
Suppose a car is traveling at +21.1 m/s, and the driver sees a traffic light turn red, What is the stopping distance of the car, as measured from the point where the driver first notices the red light
in a game of basketball a forward makes a bounce pass to the center. the ball is thrown with an initial speed of 4.0 at
Three uniform meter sticks, each of mass , are placed on the floor as follows: stick 1 lies along the axis from = 0.290 m to = 1.29 m, compute the location of the center of mass of the meter sticks
A loudspeaker on a tall pole broadcasts sound waves equally in all directions. If the sound output is 7.0 W, at what distance from loudspeaker is the sound intensity level 85.7 dB.
Sam pushes a 10.0-kg sack of bread flour on a frictionless horizontal surface with a constant horizontal force of3.0N starting from rest. What is the speed of the sack after Sam has pushed it a distance of10cm
A small rock with mass 0.200 kg is fastened to a massless string with length 0.750 m to form a pendulum. What is tension in the string at the lowest point
An ambulance has a siren of frequency 700 Hz. If the ambulance is moving at a speed of 60 miles per hour, what will be the frequency heard by a man standing on the sidewalk as the ambulance approaches him
Calculate the capacitance of an air filled parallel plate capacitor given a plate seperation of .001 meters and a plate area of .8 meter^2
A circular coil having 19 turns and a radius of R = 19.2cm carries a current of 3.30A. It is placed in a uniform magnetic field of 62.0mT. What is the magnitude of the torque acting on the coil
suppose that while lying on a beach near the equator watching the sun set over a calm ocean you start a stopwatch just
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