A windowpane is half a centimeter thick and has an area of 2.0 m2 . The temperature difference between the inside and outside surfaces of the pane is 15°C. What is the rate of heat flow through this window? (Thermal conductivity for this glass is 0.84 W / m •°C.)
a. 5000 J/s
c. 1300 J/s
b. 2500 J/s
d. 630 J/s
A
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An electron in a cathode ray tube is accelerated through a potential difference of 10 kV. What kinetic energy does the electron gain in the process? (e = 1.6 × 10^-19 C)
a. 8.0 × 10^-16 J c. 8.0 × 10^22 J b. 1.6 × 10^-15 J d. 1.6 × 10^-16 J
Which one of the following volumes is largest?
A) 500. cm3 B) liter C) quart D) cc E) cubic inch
The length of a certain wire is halved while the radius is doubled. What is the change in the resistance of this wire?
A) It stays the same. B) It is reduced by a factor of 2. C) It is reduced by a factor of 4. D) It is reduced by a factor of 8. E) It is quadrupled.
It would be very unlikely to find a massive, young star out in the halo
Indicate whether the statement is true or false