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Need these short essay questions done ASAP. Valid reputable sources are needed as is a works cited. Interned sources are fine, but no wiki or yahoo answers etc. Anywhere from a couple paragraphs or a page is fine for length, maybe 2-3 pages times new roman 12 point double spaced total if needed. 1) How does the use of H II regions to find a galaxy's distance differ from the use of Cepheid variables? in question 4 concentrate on the places we find H II regions and Cepheid variables and the distances that each can be observed. How bright are each? Are there any differences in accuracy? How do we know? How is their brightness used to determine distance? 2) How does the cluster method tell us the mass of galaxies? Question 2 requires quite a few assumptions (what are they?). Be sure to consider gravitation and redshift as you research your response. 3) What evidence do we have that the center of our galaxy is a powerful source of energy?
An amount of ideal gas is con?ned to a sealed box at one-half atmospheric pressure, i.e., 50.65 kPa. What is the new pressure of the gas in the smaller box
The magnetic field produced by an MRI solenoid 2.2m long and 1.5m in diameter is 2.2T. Find the magnitude of the magnetic flux through the core
A cube of metal has a mass of 0.569 kg and measures 3.09 cm on a side. Calculate the density and identify the metal
A flat circular coil with 110 turns, a radius of 4.10 × 10-2 m, and a resistance of 0.500 ? is exposed to an external magnetic field that is directed perpendicular to the plane of the coil, Find the induced current in the coil
Unpolarized light passes through two polarizers in turn with polarization axes at 33° to one another. What is the fraction of the incident light intensity that is transmitted
if system A has 4 cycles/pulse and is operating at 5 MHZ and system B has 5 cycles/pulse and is operating at 10 MHZ, which system has the shorter pulse duration
A 0.170 kg tumour is being irradiated by a radioactive source. Each decay of the radioactive source produces a particle with an energy of 0.450 MeV. find the activity of the radioactive source
A 5.17-g bullet is moving horizontally with a velocity of +340 m/s, where the sign + indicates that it is moving to the right, What is the velocity of the second block after the bullet imbeds itself
An aluminum rod is clamped one quarter of the way along its length and set into longitudinal vibration by a variable-frequency driving source. The lowest frequency that produces resonance is 4300 Hz. The speed of sound in an aluminum rod is 5100 m..
A 23.0 g block of copper whose temperature is 447 K is placed in an insulating box with a 92.4 g block of lead whose temperature is 132 K. find the equilibrium temperature of the two-block system
A wooden raft has a mass of 69 kg. When empty it floats in water (density 1000 kg/m3) with 25% of its volume submerged. What mass of sand can be put on the raft
An outfielder throws a 0.150 kg baseball at a speed of 54.0 m/s and an initial angle of 30.0°. What is the kinetic energy of the ball at the highest point of its motion
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