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Iodine 53131I is used in diagnostic and therapeutic techniques in the treatment of thyroid disorders. This isotope has a half-life of 8.04 days. What percentage of an initial sample of 131I remains after 20.0 days?
you compress a spring with k3000 nm a distance of 0.3m with a block of mass 4kg. after you compress the spring you
Three light bulbs each with a resistance of 50 ohm, are connected in series to a 100 Volt power supply. Determine the current flowing through third light bulb
A particle has a charge of q = +5.2 µC and is located at the origin. As the drawing shows, an electric field of Ex = +229 N/C exists along the +x axis. A magnetic field also exists, and its x and y components are Bx = +1.7 T and By = +1.3 T.
A softball of mass 0.220 kilogram that is moving with a speed of 4.0 m/s (in the positive direction) collides head-on and elastically with another ball initially at rest. Evaluate the mass of the target ball
A 4.50 kg counterweight is attached to a light cord, which is wound around a spool. The spool is a uniform solid cylinder of radius 6.00 cm and mass 1.80 kg. What is the net torque on the system about the point O
Four masses lie in a rectangular arrangement in the xy - plane. One mass is at the origin and the rectangular legs are parallel to the CS axes. Determine the net gravitational force on each of the masses
During this process the arrow's deceleration has a magnitude of 1800 m/s2 and the block's acceleration has a magnitude of 450 m/s2
A 0.150 T magnetic field B crosses the xyplane perpendicular to the x axis and at an angle of45.0° to the y axis. A square surfacewith sides of length 7.00 m lies mainly in the xyplane, but a 1.50 m section of it at one end is bent 90°in the negat..
Air streams horizontally past a small airplane's wings such that the speed is 63.0m/s over the top surface and 53.0m/s past the bottom surface. What is the direction of the net vertical force (including the effects of gravity) on the airplane
A 20 kg block rests on a variable ? frictional incline as shown below. Answer the questions concerning this block on the variable incline. Which of the following statements are true regarding the stationary block on the incline?
two planes approach each other head-on. each has a speed of 720 kmh and they spot each other when they are initially
A circular sewer having a diameter equal to 36 in. is half full of liquid. If Manning's formula is used, n is taken as .015, and the rate of slope is .0012, the rate of discharge, in cubic ft per second, would be?
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