Based on its surface temperature of 6,000 K, most photons that leave the Sun's surface lie in which region of the electromagnetic spectrum?
A) infrared B) visible C) microwave D) X-ray E) ultraviolet
B
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A machine gun, of mass 35. kg, fires 50. gram bullets, with a muzzle velocity of 750. m/s, at the rate of 300. rounds per minute. What is the average force exerted on the machine gun mount?
What will be an ideal response?
A heat conducting rod, 0.90 m long, is made of an aluminum section that is 0.10 m long, and a copper section that is long
Both sections have cross-sectional areas of The aluminum end is maintained at a temperature of and the copper end is at The thermal conductivity of aluminum is 205 W/m ? K and of copper is 385 W/m ? K. Steady state has been reached, and no heat is lost through the well-insulated sides of the rod. The temperature of the aluminum-copper junction in the rod is closest to A) 61°C. B) 58°C. C) 56°C. D) 54°C. E) 52°C.
What happens to Pluto's atmospheric gases over time?
A) Pluto traps gases from other Kuiper Belt Objects, causing its atmosphere to become much, much thicker. B) Pluto does not have an atmosphere. C) Pluto's atmosphere vaporizes over time, due to low gravity in the exosphere. D) Pluto's atmosphere is collapsing gases that freeze and fall to the surface.
Which of the following does the intensity of synchrotron radiation NOT depend on?
A) mass of the electron B) temperature C) speed of electrons D) frequency of radiation E) strength of the magnetic field