Conduction: A window glass that is 0.5 cm thick has dimensions of 3 m by 1.5 m. The thermal conductivity of this glass is 0.8 W/m ? K. If the outside surface of the glass is at -10°C and the inside surface is at 20°C, how much heat flows through the window in every hour?
A. 50 MJ
B. 60 MJ
C. 70 MJ
D. 80 MJ
Answer: D
You might also like to view...
A bubble having a diameter of 1.00 cm is released from the bottom of a swimming pool where the depth is 5.00 m. What will the diameter of the bubble be when it reaches the surface? The temperature of the water at the surface is 20.0°C, whereas it is 15.0°C at the bottom. (The density of water is 1.00 × 10^3 kg/m3.)
a. 1.05 cm b. 1.15 cm c. 1.45 cm d. 1.65 cm e. 1.35 cm
A string is stretched and fixed at both ends, 200 cm apart. If the density of the string is 0.015 g/cm, and its tension is 600 N, what is the fundamental frequency?
A. 316 Hz B. 632 Hz C. 158 Hz D. 215 Hz E. 79 Hz
Magnification is greater with a lens having a
A) high index of refraction. B) low index of refraction. C) same in each
A car with bad shocks bounces up and down with a period of 1.51 s after hitting a bump. The car has a mass of 1 600 kg and is supported by four springs of force constant k. What is k for each spring?
a. 6.9E+3 N/m b. 1.7E+3 N/m c. 1.7E+3 N/m d. 3.5E+3 N/m e. 8.2E+2 N/m