A cup of coffee is enclosed on all sides in an insulated container 1/2 cm thick in the shape of a cube 10 cm on a side. The temperature of the coffee is 95°C, and the temperature of the surroundings is 21°C. Find the rate of heat loss (in J/s) due to conduction if the thermal conductivity of the cup is 2 × 10?4 cal/s?cm?°C.
A. 62
B. 74
C. 230
D. 160
E. 12
Answer: B
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Centripetal means
a. center seeking b. pulls outward c. constant d. fast e. none of these
If an electron is released at the equator and falls toward the Earth under the influence of gravity, the magnetic force on the electron will be toward the:
a. south. c. west. b. east. d. north.
Classify the following bonds as ionic, covalent, or neither (O, atomic number 8; F, atomic number 9; Na, atomic number 11; Cl, atomic number 17; U, atomic number 92)
O with F Ca with Cl Na with Na A) covalent, ionic, covalent B) ionic, covalent, neither C) neither, ionic, covalent D) covalent, ionic, neither
Each atom in a mole of water vapor (H2O) has one electron removed. What is the total charge of the ionized gas?
A. 96 kC B. 290 kC C. 600 kC D. 190 kC