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The reason that massive neutrinos were considered as a candidate for solving the missing mass problem is that, at the conclusion of the lepton era, the universe contained about equal numbers of photons and neutrinos. They are still here, for the most part. The former can be observed and their density is measured to be about 500 photons/cm^3, thus, there must be about that number density of neutrinos in the universe, too. If neutrinos have a nonzero mass and if the cosmological expansion has reduced their average speed so that their energy is now primarily mass, what would be the individual neutrino mass (in eV/c^2) necessary to account for the missing mass of the universe? Recall that the observed mass of the stars and galaxies, accounts for about 4 percent of the mass of the universe.
A particular horizontal turntable can be modeled as a uniform disk with a mass of 230 g and a radius of 22.0 cm that rotates without friction about a vertical axis passing through its center
a racquetball with a diameter of 5.6 cm and a mass of 42 g is cut in half to make a boat for american pennies made
A candle is placed 16.0 cm in front of a convex mirror. When the convex mirror is replaced with a plane mirror, the image moves 6.5cm farther away from the mirror. Find the focal length of the convex mirror.
A constant torque of 21.4 N•m is applied to a grindstone whose moment of inertia is 0.125 kg•m2. Using energy principles, determine the angular speed (in revolutions per second) after the grindstone has made 19 revolutions. (Avoid friction.) Do no..
A 40 g rifle bullet travelling 260 m/s buries itself in a 4.0 kg pendulum hanging on a 3.0 m long string, which makes the pendulum swing upward in an arc. Find out the vertical and horizontal components of pendulum's displacement.
To throw the discus, the thrower holds it with a fully outstretched arm. Starting from rest, he begins to turn with a constant angular acceleration, what will be the speed of the discus at release
A power station delivers 530 kW of power at 12,000 V to a factory through wires with total resistance 3.5. How much less power is wasted
A nail gun fires a nail into a piece of wood. The nail is going a velocity of 6.8 m/s right before entering the wood. The mass of the nail is .06kg. what is the average force on the nail
A mercury thermometer is constructed as shown below. Find the change in height of the mercury column that occurs with a temperature change of 24.0°C
Biological muscle cells can be thought of as nanomotors that use the chemical energy of ATP to produce mechanical work. How much work is done by such proteins
A particular engine has a power output of 6.00 kW and an efficiency of 28.0%. Assume the engine expels 7000 J of energy in each cycle. Find the time required to complete each cycle
In an elastic head-on collision with a stationary target particle, a moving particle recoils at one third of its incident speed. What is the ratio of the particles' masses
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