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Suppose 100 mg of gold (197 79 Au) foil are exposed to a thermal neutron flux of 1012 neutrons/cm2/s in a reactor. Calculate the activity and the number of atoms of 198Au in the sample at equilibrium [Thermal neutron activation cross-section for 197Au is 98 barns and half-life for 197Au is 2.7 h]
A piece of lead [c = 128 J/(kg·C°)] is heated from 18.0 °C to 40.1 °C. The same amount of heat is added to a piece of copper [c = 387 J/(kg·C°)]. find the final temperature Tf of the copper
A circular parallel-plate capacitor is formed of two closely spaced disks. What is the diameter of the disks
Suppose that in each case above you were to place a small paper screen at the image location. What you would see on the screen in each case? Imagine that the room is dark except for the small bulb.
An electromagnet used to lift a car at a junkyard needs to generate a magnetic field strength of about one tesla. The magnet consists of a cylindrical iron core 1 m in diameter and 10 cm high wrapped with 100 turns of wire. Assuming the permeability ..
The magnetic coils of a tokamak fusion reactor are in the shape of a toroid having an inner radius of 0.545m, Find the magnitude of the magnetic field inside the toroid at the following locations
A negative charge of -0.535 µC exerts an upward 0.190Nforce on an unknown charge 0.325m directly below it. What is the unknown charge
a roller coaster reaches the top of the steepest hill with a speed of 5.3 kmh. it then descends the hill which is at an
Calculate the momentum of a 2140 kg elephant charging a hunter at a speed of 7.49 m/s
A car has an initial position of x = 0 m, an initial velocity of 0 m/s, and a constant acceleration of 5.0 m/s2. What is its position when the time is 3.0 seconds
Two small objects, A and B, are fixed in place and separated by 2.97 cm in a vacuum. Object A has a charge of +2.16 microC, How many electrons must be removed from object A
A gas is enclosed in a container fitted with a piston of cross sectional area 0.150 m^2. Compute the amount of heat removed from the system by heat during the compression
A 13.0 kg bucket of water of is suspendedby a rope wrapped around a pulley, which is just a solid cylinder0.300 m in diameter with mass 17.0 kg. With what speed does the bucket strike the water
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