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Two separate radioisotopes, A and B, with two different half lives (T1/2,A=3.02 days and T1/2,B=8.28 days) are used in a laboratory procedure. At the time the supplies are monitored, the activity of radioisotope A is observed to be 3 times greater than the activity of the second radioisotope. Find how many days later will the two activates be equal?
A speeding motorist zooms through at 75km/h, without noticing a police car by the roadside. Calculate the speed of the police car when it catches the speeding motorist
Consider a bright star in our night sky. Assume its distance from Earth is 89.4 light-years (ly) and its power output is 4.00 multiply.gif 1028W, Find the intensity of the starlight at the Earth
after completing the calculations below sketch the ph curve for the titration of 25.0 ml of 0.200m solution of a weak
A diver completes somersaults during a 2.1 sec dive. What was the diver's average angular speed during the dive
Particles pass through a single slit of width 2.3 mm. The de Broglie wavelength of each particle is 515 nm. After the particles pass during the slit, they spread out over a range of angles.
A 650kg elevator starts from rest and moves upwards for 3sec with aconstant acceleration until it reaches a cruising speed of1.75m/s. What is the average power of elevator motor duringthis period
A battery of ε = 2.00 V and internal resistanceR = 0.450 Ω is driving a motor. The motor is lifting a 2.0N mass at constant speed v = 0.50 m/s. Assumingno energy losses, find the current i in the circuit. Enter the lower current.
the position of a particle moving along the x axis is given in centimeters by x 9.68 1.18 t3 where t is in seconds.
An electron of energy 400 eV moves at right angles to a uniform magnetic field along an arc of radius 2.0cm. What is the energy of the second electron
A camera is equipped with a lens with a focal length of 23 cm. how far from the film should the lens be placed
a simple harmonic oscillator consists of a 100 g mass attached to a spring whose force constant is 104 dyne cm. the
a wire has a current density of 7.81 times 106 am2. if the cross-sectional area of the wire is 1.23 mm2 what current
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