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90Sr is one of the most deadly products of nuclear ?ssion. Assume that 4% of the ?ssion fragment yield from a 235U atomic bomb is 90Sr. In a nuclear interchange on the planet Inhospitable, 1000 atomic bombs, each corresponding to the ?ssion of 100 kg of 235U, are detonated.
(a) How many atoms of 90Sr are released?
(b) Assuming the 90Sr is spread evenly over the planet of diameter 12,000 km, what is the resulting activity for each m2? The half-life of 90Sr is 28.8 y.
A rocket stuck on a car. After 3s the fuel is out and the car is moving at 1m/s2 . The car continues to move for 5s. Find initial velocity, final velocity, total distance, initial distance and draw motion diagrams.
Assume that the cost of liquid nitrogen is $0.30 per liter, and that electric energy costs $0.10 per kWA·h. What is the resistance of a normal wire that costs as much in wasted electric energy as the cost of liquid nitrogen for the superconductor?
Electric charge Q has been spread uniformly over a circular arc of radius R and central angle 40 degrees. What is the potential at point P, center of curvature of the arc.
A capacitor with air between its plates is charged to 70 V and then disconnected from the battery. What is the dielectric constant of this glass
A thin, flexible rod of length L=10 cm carries charge Q=91 N/C uniformly along its length. What is the magnitude of the electric field at the center
A magnetic fi eld is oriented at an angle = 60 degrees to the normal of a rectangular area. If the magnetic fi eld has a strength of B = 4*10^-3T, what is the area of a rectangle
A pedestrain bridge consists of a walkway of mass 1000kg and length 10.0m supported at each end by brackets. Two people, each of mass 80kg, are walking across the bridge.
Two large, parallel, metal plates carry opposite charges. They areseparated by 0.1 m and the potential difference between them is500. V. What is the magnitude of the electric field, if it is uniform inthe region between the plates?
A student sits on a freely rotating stool holding two dumbbells, each of mass 3.02 kg, Find the new angular speed of the student
Some European trucks run on energy stored in a rotating flywheel, with an electric motor getting the flywheel up to its top speed of 200p rad/s. What is the kinetic energy of the flywheel after charging
An electron is accelerated through a potential difference of 3 eV and is incident on a finite potential barrier of height 5 eV and thickness 5 x 10 * m. What is the probability that the electron will tunnel through the barrier? Show all steps.
A force of 100 N is applied to a 50 kg mass in the direction of motion for a distance of 6.0 m, how much work is done by the varying force
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