The zeroth law of thermodynamics allows us to define:
A. work
B. pressure
C. temperature
D. thermal equilibrium
E. internal energy
Answer: C. temperature
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Which of the following statements is not an assumption used in models of galaxy formation?
A) The universe started out filled almost uniformly with hydrogen and helium. B) Some regions in the universe were slightly more dense than others. C) The universe is expanding. D) Gas contracted to form the disks of galaxies before any stars were born.
Which of the following is a unit for rotational velocity?
A. hours/radians B. Radians C. Rev/sec D. degrees
What is the energy of a photon that has the same wavelength as a 100-eV electron?
A) 1000 eV B) 10,000 eV C) 100 eV D) 50 eV E) 200 eV
A straight wire of length 70 cm carries a current of 50 A and makes an angle of 60° with a uniform magnetic field. If the force on the wire is 1.0 N what is the magnitude of B?
a. 41 mT b. 33 mT c. 55 mT d. 87 mT e. 57 mT