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A drug prepared for a patient is tagged with 4399Tc which has a half life of 6.05 h and an activity of 2.10 µCi when it was prepared. Suppose the drug containing 4399Tc is injected into the patient 1.20 h after it is prepared. What is its activity at the time it is injected?
Sheena can row a boat at 2.95 mi/h in still water. She needs to cross a river that is 1.17 mi wide with a current flowing at 1.79 mi/h. Not having her calculator ready, she guesses that to go straight across, she should head 60.0° upstream.
The power dissipated in a series RCL circuit is 56.3 W, and the current is 0.273 A. Determine the voltage of the generator
Two identical small insulating balls are suspended by separate0.25-m threads that are attached to a common point on the ceiling. Each ball has a mass of 8.0 x 10-4 kg. Initiallythe balls are uncharged and hang straight down.
A baseball player hits a ball at 49.2m/s at an angle of 29.0 degrees above the horizontal. The outfield bleachers are 145 m away from the home plate.
A block of ice weighs 100 N. You can lift the block vertically a distance of 2 m. You can also push the same block up a ramp that is 4 m long, What is the increase in the block's gravitational potential energy in each case
Two equal blocks are attached to two identical springs. (The two blocks at equilibrium are touching) Block A is pulled to the left, Find the location at which the blocks hit
a turntable 1.50m in diameter rotates at 80.0rpm. two speakers each giving off sound of wavelength 30.7cm are attached
It takes 25 turns to drive a screw completely into a block of wood. Because the friction force between the wood and the screw is proportional to the contact area between the wood, what is the total work (in J) required to drive in the screw
In an LC circuit where L = 12 mH and C = 30 μF with anelectro magnetic oscillation the current amplitude is 2.5mA. find the natural frequency and the period of the oscillation
In an X-ray scattering measurement the first order diffraction peak is observed at ? = 16.2°. At what angle is the second order peak observed? What is the angle of the third order peak?
The wavelength of light visible to the human eye is on the order of 6 × 10-7 m. Find the frequency of the lightwave if the speed of light in air is 2.99792 × 108 m/s
While the force pushes the box a distance of 8.00 m, the speed changes from 0.500 m/s to 2.60 m/s. What ia the work done by friction during this process?
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