A 40.0-g block of ice at -15.00°C is dropped into a calorimeter (of negligible heat capacity) containing water at 15.00°C. When equilibrium is reached, the final temperature is 8.00°C
How much water did the calorimeter contain initially? 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) 302 g
B) 345 g
C) 405 g
D) 546 g
E) 634 g
D
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If the density of the universe is less than the critical density, then the total energy of the universe is
A) zero. B) negative. C) positive.
A Trombe wall is a masonry wall often used in passive solar homes to store solar energy. Suppose that such a wall, fabricated from 20-cm-thick solid concrete blocks (k = 0.13 W/(mK), ? = 0.05 × 10–5 m2/s) is initially at 15°C in equilibrium with the room in which it is located. It is suddenly exposed to sunlight and absorbs 500 W/m2 on the exposed face. The exposed face loses heat by radiation and convection to the outside ambient temperature of –15°C through a combined heat transfer coefficient of 10 W/(m2 K). The other face of the wall is exposed to the room air through a heat transfer coefficient of 10 W/(m2 K). Assuming that the room air temperature does not change, determine the maximum temperature in the wall after 4 hours of exposure and the net heat transferred to the room.
GIVEN • Trombe wall suddenly exposed to sunlight FIND (a) Maximum temperature in the wall after 4 hours (b) Heat input to the room
What is the Physics Primer?
A. A set of mathematics topics that are relevant to introductory physics courses. B. A list of the most important formulas used in introductory physics courses. C. A detailed explanation of all of the mathematics you will use in your introductory physics course. D.A tutorial of the most important physics concepts covered in introductory physics courses
Identical point charges (+20 ?C) are placed at the corners of an equilateral triangle with sides of 2.0-m length. How much external energy is required to bring a charge of 45 ?C from infinity to the midpoint of one side of the triangle?
a. 26 J b. 16 J c. 23 J d. 21 J e. 12 J