Physics, 17.11.2019 20:31 angelteddy033
A320.9 ng sample of an unknown radioactive substance was placed in storage and its mass measured periodically. after 47 days the amount of radioactive substance had decreased to 40.11 ng. how many half‑lives of the unknown radioactive substance have occurred?
Answers: 2
Physics, 21.06.2019 21:00
50 g of ice at 0°c is dropped in a beaker containing 100 g of water at 0°c. what will be the contents of the beaker after 5 hours? assume that the room temperature is 0°c.
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Physics, 22.06.2019 08:30
What is the primary force that suspension bridges use cables to hold their spans up? a. tension force b. resistance force c. normal force d. elastic force e. applied force
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Physics, 22.06.2019 18:00
Which of the following is not a physical property of mattera. melting pointb.heat of combustionc. viscosityd. boiling point
Answers: 1
A320.9 ng sample of an unknown radioactive substance was placed in storage and its mass measured per...
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