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At very high temperatures (as in the very early universe), the proton and the neutron can be thought of as two different states of the same particle, called the "nucleon." (The reactions that convert a proton to a neutron or vice require versa the absorption of an electron or a positron or a neutrino, but all of these particles tend to be very abundant at sufficiently high temperatures.) Since the neutron's mass is higher than the proton's by 2.3 x1030 kg its energy is higher by this amount times c2. Suppose, then, that at some very early time, the nucleons were in thermal equilibrium with the rest of the universe at 1011 K. What fraction of the nucleons at that time were protons, and what fraction were neutrons?
A particle with a charge of -60.0 nC is placed at the center of anonconducting spherical shell of inner radius 20.0 cm and outerradius 28.0 cm. The sphericalshell carries charge with a uniform density of -3.46 µC/m3.
Determine the heat transfer and work for each of the processes. What is the internal energy change for Process 1-2? What is the internal energy change for Process 2-3? (There is an answer posted for the same question, but the answer does not appea..
Bowling balls can be made from a variety of substances and are required to have a circumference of roughly 27.2 inches. calculate the thickness of the shell
The power supply for a pulsed nitrogen laser has a 0.060micro-F capacitor with a max voltage rating of 25 kV. what is the power of the laser pulse
A car goes around a curve on a road that is banked at an angle of 31.5 degrees. What is the radius of the curve
A cannon tilted up at a 26 degree angle fires a cannon ball at 71m/s from atop a 12m -high fortress wall
Two equally charged insulating balls each weigh 0.44 g and hang from a common point by identical threads 40 cm long. The balls repel each other so that the separation among their centers is 6.4 cm. What is the magnitude of the charge on each ball?
A gamma-ray telescope intercepts a pulse of gamma radiation from a magnetar, a kind of star with a spectacularly large magnetic field. The pulse lasts 0.16 s and delivers 9.5 x10 -6 J of energy vertically to the 59-m 2 surface area of the telescope..
A turbine blade rotates with angular velocity w(t)= 2.00 rad/s - 2.100 rad/s^3 t^2. What is the angular acceleration of the blade at t = 9.1 s
during a 5.45 s interval a particles coordinates change from x 10.4 m y 4.95 m to x 28.8 m y -4.95 m. assuming the
What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 570 nm? The index of refraction of the film is 1.35, and there is air on both sides of the film.
A battery charger is connected to a dead battery and delivers a current of 3.7 A for 2.1 hours, How much energy is delivered to the battery
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