A comet is discovered in an elliptical orbit around the sun. Its closest distance from the sun is 1.0 AU, and measurements of its speed at this distance imply that its greatest distance from the sun is 7 AU. About how many years will pass between the comet’s approaches to the sun?
A. 8 y
B. 16 y
C. 22.6 y
D. 64 y
E. 226 y
F. Other (specify)
A. 8 y
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As shown in the figure, a container has a vertical tube, whose inner radius is 32.00 mm, connected to it at its side. An unknown liquid reaches level A in the container and level B in the tube level A being 5.0 cm higher than level B. The liquid supports a 20.0 cm high column of oil, between levels B and C, whose density is 460 kg.m-3. What is the density of the unknown liquid?
A. 1800 kg/m3
B. 1600 kg/m3
C. 1400 kg/m3
D. 2000 kg/m3
E. 1700 kg/m3
A 4.0 ?F and a 1.0 ?F capacitor are connected in parallel and both are charged with a 12. volt battery. They are disconnected from the battery and reconnected positive side of the 1st to negative side of 2nd, and neg. side of 1st to pos
side of 2nd. (a) How much was each charged when connected to the battery? (b) After reconnecting, how much charge is stored? (c) What potential exists across the final parallel combination?
One kilogram of chilled water (0°C) is placed in a freezer which is kept at 0°F (?18°C). Approximately how much electric energy (in kilocalories) is needed just to freeze the water if the room temperature is maintained at 75°F (24°C)? (Lice = 333 J/g; cice = 209 J/g/°C.)
a. 11 b. 15 c. 16 d. 13 e. 33
How much heat is produced in the 10-? resistor in 5.0 s when ? = 18 V?
a.
72 J
b.
32 J
c.
50 J
d.
18 J
e.
90 J