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Galaxy mergers in a rich cluster could impede their use as standard candles over time as they tend to brighten. The Coma cluster of galaxies contains N ~ 1000 galaxies within its half mass radius of rh ~ 1.5 Mpc.
a) What is the mean number density of galaxies within the half mass radius? Suppose the typical physical cross section of a galaxy is sigma ~ 10^-3 Mpc^2.
How much work is done by the horizontal force F_p = 150 N on the 18 kg block of the figure when the force pushes the block 5.5 m up along the 32 degree frictionless incline
q1. a sling-thrower puts a stone 0.250 kg in the slings pouch 0.010 kg and then begins to make the stone and pouch move
The pilot of an airplane executes a loop-the-loop maneuver in a vertical circle. What is the pilot's apparent weight at the lowest point if his true weight is 160 lb
Two masses, m1= 3.32 kg and m2= 5.00 kg are on a horizontal frictionless surface and they are connected together with a rope, What is the acceleration of the whole system, when this maximum force is appiled
Displacement vector A points due east and has a magnitude of 3.22 km. Displacement vector B points due north and has a magnitude of 7.44 km. Displacement vecto Cr points due west and has a magnitude of 7.88 km.
a ball of mass 0.203 kg has a velocity of 1.43 ms right a ball of mass 0.291 kg has a velocity of 0.396 ms left. they
What is tension in each rope
An ideal gas is expanded isothermally from 20L to 30L. During thismethod , 6J of energy is expended by the external mechanism that expanded the gas. Which of the statements is correct.
Derive an expression for the surface temperature of the Sun, in terms only of its solid angle, its flux per unit wavelength f(lambda1) at Earth at one wavelength (lambda 1) and its fundamental constants
Each summer along the Oregon coast there is a contest for archers. People line the beaches and wait for a low-flying airplane to pass overhead loaded with goodies.
A long cylindrical insulating shell has an inner radius of a = 1.42 m and an outer radius of b = 1.62 m, What is the magnitude of the electric field at a distance of r= 0.59 m from the axis
Two pencils have the same average density (500 kg/m^3). The mass of the mechanical pencil is twice the mass of the conventional pencil. Which accelerates at the greater rate
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