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A drug prepared for a patient is tagged with 9943Tc which has a half-life of 6.05 h. Suppose the drug containing 9943Tc with an activity of 1.30?Ci is injected into the patient 1.80h after it is prepared.
What is its activity at the time it is injected?
R=___________________ ?Ci
A wheel with radius 43.9 cm rotates 4.27 times every second. What is the tangential speed of a wad of chewing gum stuck to the rim of the wheel
A golfer hits a shot to a green that is elevated 3.20 m above the point where the ball is struck. find the speed of the ball just before it lands
Use the ideal gas approach to find the thermal velocity, and determine the scaling law based on the resulting equation
A sample of ideal gas occupies a volume of one litre at atmospheric pressure and temperature, 20 C. What pressure is required to squeeze the gas into one-half litre at 40 C?
A boy coasts down a hill on a sled, reaching a level surface at the bottom with a speed of 6.9 m/s. how far does the sled travel on the level surface before coming to rest
A laser beam of unknown wavelength is incident on a single slit of width 0.25 mm and forms a Fraunhofer diffraction pattern on a screen 2.0 m away. The width of the central bright fringe is measured to be about 7 mm.
You are given a four-wheeled cart of mass 19 kg, where the distance between a wheel and its nearest neighbors is 1.7 m. Find the weight on the nearer wheels of the cart under this load
A whale swims due east for a distance of 1.5 km, turns around and goes due west for 5.7 km, and finally turns around again and heads 4.5 km due east. What is the total distance traveled by the whale
Write down an equation for the radial component
Find the direction of the net force exerted on the Sun. Give the direction relative to the line connecting the Sun and the Moon
Two identical capacitors store different amounts of energy: capacitor A stores 2.4 x 10-3 J, and capacitor B stores 1.3 x 10-4 J. Find the voltage across the plates of capacitor A
planet zero has a mass of 5.0 x 10 ^23 kg and a radius of 2.0 x 10 ^6 m. What is the speed of the probe when it is 3.0 x 10^ 6 m from zeros center
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