Where does the chemical reaction known as "respiration" occur?
A) at many points all over your body
B) in the lining of your lungs
C) in the air while it is being held in your lungs
D) in living plants
E) in your nose
A
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The search for black holes involves searching for
a. single stars that emit large amounts of X-rays. b. X-ray binaries where the compact companion has a mass in excess of 3 Mo. c. large spherical regions from which no light is detected. d. pulsars with periods less than one millisecond. e. pulsars that are orbited by planets.
Which of these is the likely progenitor of a type II supernova?
A) a mass-transfer binary, with the white dwarf already at 1.3 solar masses B) a contact binary, with the neutron star at 2.3 solar masses C) an evolved red giant which is just starting to make silicon in its core D) two white dwarfs in a contact binary system E) an evolved blue supergiant that is about to experience the helium flash
Earth's gravity attracts a person with a force of 120 lbs. The force with which the Earth is attracted towards the person is
A. small but not zero. B. zero. C. billions and billions of tons. D. 120 lbs.
A surface has a work function 1.70 eV and has light of wavelength 400 nm shone on it. What is the kinetic energy of the photoelectrons emitted?
A) 4.52 eV B) 3.11 eV C) 1.41 eV D) 2.82 eV E) 1.70 eV