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Perfluorooctane sulphonate (PFOS) is considered to be a persistent environmental pollutant, with a half life in natural water of approximately 41 years. It is resistant to hydrolysis, photolysis, and aerobic and anaerobic biodegradation. Explain why PFOS is so resistant to these processes.
A ball of mass 0.15 kg is dropped from rest from a height of 1.35 m. It rebounds from the floor to reach a height of 0.96 m. What is the velocity of the ball just before the impact
Water flowing through a 2.2 cm -diameter pipe can fill a 400 L bathtub in 6.0 min. What is the speed of the water in the pipe
a space vehicle is coasting at a constant velocity of 15.7 ms in the y direction relative to a space station. the pilot
The battery charger for an MP3 player contains a step-down transformer with a turn ratio of 1:40, What voltage does the secondary coil of the transformer provide
light of wavelength 7.5x10-7 meter in air is incident normally perpendicularly on a double slit. the distance between
If this system is used with a detector with an intrinsic pulse height resolution of 4%, what will be the expected overall pulse height resolution
A free electron and a free proton are placed in an identical electric field. which of the following statement are true?
A child ties a rock to a string and whirls it around in a horizontal circle. Find the period of its uniform circular motion
At the end of an amusement park ride, you want the gondola to stop without the acceleration exceeding 2 g's. what is the maximum allowed braking force
question a 6.5-microf capacitor is connected in series with 4.2 mo resistor and this combination is connected across an
a penny is sitting on the edge of an old phonograph disk that is spinning at 45 rpm and has a diameter of 6.5 inches.
A child slides down a snow covered slope that makes an angle of 20 degrees with the horizontal. At what angle would the child slide with constant speed
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