If you had limited funds to build a large telescope, which type would you choose, a refractor or a reflector? Why?
What will be an ideal response?
One would choose a reflector because it is much easier to manufacture a large mirror than a large lens.
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Size of the Nucleus: Estimate the radius (in fm) of a radon nucleus that contains 86 protons and 136 neutrons.
Fill in the blank(s) with the appropriate word(s).
Astronomers believe that the X-ray radiation from the nuclei of active galaxies comes from ________.
A. gravity waves B. a black hole C. magnetic fields D. the accretion disk around a massive black hole
Incompressible water flows out of a large reservoir through a pipe that opens to the atmosphere 5.70 m below the level of the water in the reservoir. What is the speed of the water as it comes out of the pipe?
A) 1.72 m/s B) 7.47 m/s C) 55.8 m/s D) 10.6 m/s E) 27.9 m/s
A potential difference of 12.4 V is placed across a 4.1
resistor. What is the current in the resistor?
A. 51 A B. 3.0 A C. 0.33 A D. 16A E. 8.3 A