Which unit is a unit of power?
a. The volt.
b. The ampere.
c. The ohm.
d. The watt.
e. The joule.
d
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Nonbelt asteroids can become trapped in the _______________ along Jupiter's orbit
Fill in the blank(s) with correct word
On a cold winter day, the outer surface of a 0.2-m-thick concrete wall of a warehouse is exposed to a temperature of –5°C, while the inner surface is kept at 20°C. The thermal conductivity of the concrete is 1.2 W/(m K). Determine the heat loss through the wall, which is 10-m long and 3-m high.
GIVEN
10 m long, 3 m high, and 0.2 m thick concrete wall
Thermal conductivity of the concrete (k) = 1.2 W/(m K)
Temperature of the inner surface (Ti) = 20°C
Temperature of the outer surface (To) = –5°C
FIND
The heat loss through the wall (qk)
ASSUMPTIONS
One dimensional heat flow
The system has reached steady state
SKETCH
Why is Newton's version of Kepler's third law so useful to astronomers?
A) It allows us to calculate distances to distant objects. B) It can be used to determine the masses of many distant objects. C) It tells us that more-distant planets orbit the Sun more slowly. D) It explains why objects spin faster when they shrink in size.
Water is being sprayed from a nozzle at the end of a garden hose of diameter 2.0 cm. If the nozzle has an opening of diameter 0.50 cm, and if the water leaves the nozzle at a speed of 15 m/s, what is the speed of the water inside the hose?
a. 0.63 m/s c. 2.5 m/s b. 0.94 m/s d. also 10 m/s