When water boils, its temperature __________
Fill in the blank(s) with correct word
stays constant
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A spherical interplanetary probe with 30-cm diameter contains electronic equipment that dissipates 100 W. If the probe surface has emissivity of 0.8, what is its surface temperature in outer space? State your assumptions in calculation.
GIVEN Interplanetary probe with 30-cm diameter, radius(r) =0.15 m Dissipation qr=100 W and emissivity (?)=0.8 • FIND Surface temperature in outer space. ASSUMPTIONS • Steady state condition. • Heat transfer only by radiation. • Temperatue of outer space is considered 0 Kelvin. (T2)=0 K PROPERTIES AND CONSTANTS The Stefan-Boltzmann constant (?) = 5.67 × 10–8 W/(m2 K4)
An ideal gas increases in temperature from 22°C to 42°C by two different processes. In one process, the temperature increases at constant volume, and in the other process the temperature increases at constant pressure
Which of the following statements about this gas are correct? (There may be more than one correct choice.) A) The heat required to cause this temperature change is the same for both the constant-volume and the constant-pressure processes. B) More heat is required for the constant-pressure process than for the constant-volume process. C) The change in the internal (thermal) energy of the gas is the same for both the constant-volume and the constant-pressure processes. D) The root-mean-square (thermal) speed of the gas molecules increases more during the constant-volume process than during the constant-pressure process.
Which of the following materials has the largest conductivity (at 20°C)?
A) copper B) platinum C) silver D) iron E) glass
The radius of a typical nucleus is about 5 × 10-15 m
Assuming this to be the uncertainty in the position of a proton in the nucleus, estimate the uncertainty in the proton's energy, in MeV. (mproton = 1.67 × 10-27 kg, h = 6.626 × 10-34 J ? s, 1 eV = 1.6 × 10-19 J) A) 0.8 MeV B) 1.0 MeV C) 0.6 MeV D) 0.4 MeV