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A certain isotope of technetium has a half-life of 6.0 hours. Technetium is used in various medical procedures such as stress tests on the heart. What fraction of an initial dose remains in the body 24 hours after the initial dose?
The aluminum bomb has a mass of 0.725 kg and is placed in 2.6kg of water contained in an aluminum calorimeter cup of mass 0.624 kg. The initial temperature of the mixture is 15°C, and its temperature after ignition is 53.5°C.
An electron with a speed of 5.83 x 108 cm/s enters an electric field of magnitude 4.92 x 103 N/C, traveling along the field in the direction that retards its motion.
At the instant a traffic light turns green, a van that has been waiting at the intersection starts ahead with a constant acceleration of 2.00 m/s2. Find the speed of the van when it passes the truck
a rock is thrown horizontally with a speed of 17 ms from a vertical cliff of height 30 m.a how long does it take to
An electric motor rotating a workshop grinding wheel at a rate of 100rev/min is switched off. Determine through how many radians has the wheel turned
A 39.6-kg boy, riding a 2.33-kg skateboard at a velocity of +5.07 m/s across a level sidewalk, find the skateboard's velocity relative to the sidewalk at this instant
A water dispenser for pets has an invented plastic bottle ( the water is dyed blue for contrast).When a certain amount of water is drunk from the bowl, Explain the operation of the dispenser
A rotating wheel requires 5.00 s to rotate 26.0 revolutions. What is the constant angular acceleration (in rad/s) of the wheel
A 4.60kg package slides 1.59m down a long ramp that is inclined at 12.2 m below the horizontal. Calculate the work done on the package by friction
In a car lift, compressed air with a gauge pressure of 4.0 × 10^5 Pa is used to raise a piston with a circular cross-sectional area. what is the maximum mass that can be raised using this piston
A man pulls a 53.0 kg box horizontally from rest while exerting a constant horizontal force, displacing the box 3.20 meters in 2.00 seconds. Find the force the man exerts on the box.
Mary needs to row her boat across a 200 m-wide river that is flowing to the east at a speed of 1.1 m/s. Mary can row with a speed of 2.4 m/s. What is her speed with respect to the shore
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