Which of the following is not an assumption of cosmology?
a. Isotropy
b. Universality
c. Congruency
d. Homogeneity
C
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An airplane moves 140 m/s as it travels around a vertical circular loop which has a 1.0-km radius. What is the magnitude of the resultant force on the 70-kg pilot of this plane at the bottom of this loop?
A. 2.1 kN B. 1.4 kN C. 0.69 kN D. 1.5 kN E. 1.3 kN
A 600-g piece of iron at 100°C is dropped into a calorimeter of negligible specific heat containing 100 g of ice at 0°C and 120 g of water, also at 0°C
What is the final temperature of the system? The specific heat of iron is 448 J/kg ? K, the latent heat of fusion of water is 33.5 × 104 J/kg, and the specific heat of water is 4186 J/kg ? K.
If the number of turns on the transformer input is greater than the number on the output, then the transformer
A. outputs greater voltage than at the input. B. outputs less current than at the input. C. outputs greater voltage and current than at the input. D. outputs less voltage than at the input. E. increases the voltage but does not affect the current.
A "weightless" astronaut in an orbiting space vehicle is
A) shielded from Earth's gravitational effects. B) beyond the pull of gravity. C) without a support force. D) all of the above E) none of the above