In science, conceptual representations of observed phenomena are referred to as
A) facts
B) hypotheses
C) models
D) beliefs
C
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Calorimetry: A 35-g block of ice at -14°C is dropped into a calorimeter (of negligible heat capacity) containing 400 g of water at 0°C. When the system reaches equilibrium, how much ice is left in the calorimeter? The specific heat of ice is 2090 J/kg ? K, that of water is 4186 J/kg ? K, and the latent heat of fusion of water is 33.5 × 104 J/kg.
A. 32 g B. 33 g C. 35 g D. 38 g E. 41 g
A car initially traveling at 60 km/h accelerates at a constant rate of 2.0 m/s2. How much time is required for the car to reach a speed of 90 km/h?
A) 30 s B) 15 s C) 45 s D) 4.2 s
Most of the mass of the Milky Way seems to exist in the form of
A) population II stars in the Halo. B) dark matter out in the Halo. C) population I stars in the disk. D) hydrogen gas in the disk and spiral arms. E) the black hole in the Galactic Center.
What is the critical angle?
a. The angle of incidence below which total internal reflection takes place. b. The smallest angle of incidence that is greater than its angle of reflection. c. The angle of incidence above which total internal reflection takes place. d. The angle of incidence that equals its angle of refraction. e. The angle at which light enters a new material.