How do regions showing strong radio emission from molecules look in the visible-light image? Are they bright or are they dark?
What will be an ideal response?
Regions with strong radio emissions are dark in the visible-light image.
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Long 20 cm by 20 cm square steel stock having a thermal conductivity of 50 W/mK and thermal diffusivity of 1 x 10^-5m^2/s is put in oil at 100ºC when the steel stock is at 300ºC. With a convective heat transfer coefficient of 150 W/m^2K, determine the temperature of the center and the edge of the stock after being heated for 2 minutes in the oil.
What will be an ideal response?
Why must lander probes on Mars be sterilized before launch?
A) to prevent terrestrial microbes hitching a ride on the probe and contaminating the Martian surface B) to prevent terrestrial microbes destroying the electronics in the probe during its passage to Mars C) to prevent Martian dust from building up on the probe on the surface D) to prevent Martian microbes from contaminating the lander probe
What is the sum of 1.53 + 2.786 + 3.3 expressed to the correct number of significant figures?
A) 7 B) 7.6 C) 7.62 D) 7.616 E) 7.6160
What kinematic concept (distance, velocity, acceleration, etc.) of the moving object does the slope of the graph represent?