During the first reaction of the proton-proton chain of nuclear fusion, a weak force causes one of the protons to transform into a neutron and emit ____
a. a deuterium and an electron
b. a positron and a deuterium
c. a positron and a neutrino
d. a neutrino and a deuterium
e. a neutrino and an electron
c
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The period P of oscillation of a pendulum (the time interval needed to complete one full oscillation) can be expressed in terms of the mass m of the plumb bob, the length l of the string, and the acceleration due to gravity, g, as P = kmb1cgd, where
k, b, c, and d are dimensionless constants. What must be the values of b, c, and d?
One of the larger problems in municipal recycling programs is
a. public awareness b. finding markets for materials c. net energy used in recycled material preparation d. declining number of landfills
Which of the following kinds of stars best obey the mass-luminosity relation?
a. main sequence stars b. giant stars c. supergiant stars d. white dwarfs e. all of the above
Equilibrium: A 15-kg child is sitting on a playground teeter-totter, 1.5 m from the pivot. What is the minimum distance, on the other side of the pivot, such that a 220-N force will make the child lift off the ground?
A. 1.0 m B. 1.5 m C. 0.10 m D. 9.8 m E. 2.4 m