Starting with a sample of pure parent radionuclide, what would be the ratio of the parent radionuclide to its daughter after one half-life has elapsed?
a. 1 to 1
b. 1 to 2
c. 1/2 to 1
d. 2 to 1
a
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A spool whose inner core has a radius of 1.00 cm and whose end caps have a radius of 1.50 cm has a string tightly wound around the inner core. The spool is free to roll without slipping on a horizontal surface
If the string unwinds horizontally from the top of the core with a constant speed of 29.0 cm/s, what is the speed of the spool? A) 17.4 cm/s B) 25.0 cm/s C) 37.5 cm/s D) 50.0 cm/s E) 75.0 cm/s
If a charged particle is moving through a magnetic field with its velocity at an angle of 45 degrees with respect to the field, what happens to the magnetic force on it if both the speed and magnetic field are doubled?
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A sealed 89-m3 tank is filled with 6000 moles of oxygen gas (O2 ) at an initial temperature of 270 K. The gas is heated to a final temperature of 350 K
The ATOMIC mass of oxygen is 16.0 g/mol, and the ideal gas constant is R = 8.314 J/mol • K = 0.0821 L • atm/mol • K. The initial pressure of the gas is closest to A) 0.15 MPa. B) 0.17 MPa. C) 0.19 MPa. D) 0.13 MPa. E) 0.11 MPa.