Sirius is a binary star, consisting of Sirius A and Sirius B. Sirius B is a
a. red giant.
b. white dwarf.
c. planetary nebula.
d. neutron star.
b
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Rotational Dynamics: A small 355-g box hangs from one end of a thin light string that goes over a frictionless pulley having a moment of inertia of 0.0125 kg ? m2 and a radius of 15 cm. A second small package, this one of mass 680 g, hangs from the other end of the string. When the packages are released, the larger one accelerates downward, the lighter one accelerates upward, and the pulley turns without the string slipping.(a) What is the tension in the string on the side of the 355-g package?(b) At what rate do the packages change their speeds?
What will be an ideal response?
Radioactive Decay: The atom 40K decays radioactively to the gas 40Ar. An ancient rock is found to contain enough 40Ar gas to indicate that 77.0% of the 40K in the rock has decayed to 40Ar since the rock solidified. (Any previous argon would have boiled out of liquid rock.) How long ago did the rock solidify? The half-life of 40K is 1.25 billion years.
A. 2.65 billion years B. 0.471 billion years C. 1.80 billion years D. 0.324 billion years
The uncertainty principle can be used to relate the uncertainties in which two quantities?
A) position and momentum B) the force of gravity and the force of electromagnetism C) spin and charge D) position and spin E) mass and energy
The nuclei of radioactive isotopes can sometimes give off
A) visible radiation B) UV rays C) gamma rays D) X-rays