A 360-g metal container, insulated on the outside, holds 180.0 g of water in thermal equilibrium at 22.0°C
A 24.0-g ice cube, at the melting point, is dropped into the water, and when thermal equilibrium is reached the temperature is 15.0°C. Assume there is no heat exchange with the surroundings. For water, the specific heat capacity is 4190 J/kg ? K and the heat of fusion is 3.34 × 105 J/kg. What is the specific heat capacity of the metal of the container?
A) 970 J/kg ? K
B) 2800 J/kg ? K
C) 1700 J/kg ? K
D) 2300 J/kg ? K
E) 3300 J/kg ? K
C
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The most accurate way to determine the surface temperature of a star is to study
a. the pattern of absorption lines from various atoms. b. the relative intensities of light measured through different photometric filters. c. the peak wavelength of the star's continuous blackbody spectrum. d. pattern of emission lines that are on the star's spectrum.
Observer A is 3.0 m from a tiny light bulb and observer B is 12.0 m from the same bulb. Assume that the light spreads out uniformly and undergoes no significant reflections or absorption
If observer B sees a light of intensity I, the light intensity that A sees is A) I. B) 9I. C) 16I. D) 36I. E) 144I.
About 75% of the mass of the visible universe is composed of which element?
a. Helium b. Iron c. Hydrogen d. Silicon
A mass, m, is hung from a spring that has a spring constant, k, and the system is set into oscillation. The period of the oscillation is measured and recorded as T. If the mass is doubled and the spring is replaced by a less-stiff one that has half the spring constant, k/2, what will happen to the subsequent period of oscillation of the new spring-mass combination?
1.It will remain the same. 2.It will quadruple. 3.It will double. 4.It will halve.