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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 helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 123 kilogram laser sensor that measures the thickness of the ice. evaluate the tension in the cable towing the sensor
A window washer with a mass of 79.0 kg stands a distance, D = 0.800 m, from the left end of a plank of length, L= 1.90 m, Find T2, the tension in the right cable
If the electric field has a magnitude of 1.5 N/C, what is the speed of each fragment in the gel? How long will it take the smaller fragment to move a distance 1 cm (a typical distance used in DNA fingerprinting)?
A motor boat haeds due east at 5 m/s acorss a river that flows toward the south at 5 m/s. If the river is 125m wide, how longs does it take the boat to cross the river.
a car battery has a rating of 170 ampere-hours. this rating is one indication of the total charge that the battery can
a banked circular highway curve is designed for traffic moving at 56 kmh. the radius of the curve is 201 m. traffic is
a flash unit for a camera has a capacitance of 1155 microf. what resistance is needed in this rc circuit if the flash
two circuits are constructed using identical ideal batteries emf e and identical lightbulbs resistance r. if each
A child sits in a wagon with a pile of 0.403 kg rocks. If she canthrow each rock with a speed of 11.7 m/s relative to the ground, how many rocks must she throw
a diffraction grating that has 2000 slits per centimeter is used to analyze the spectrum of mercury.a find the angular
A uniform cylinder of radius 10 cm and mass 13 kg is mounted so asto rotate freely about a horizontal axis that is parallel to and3.2 cm from the central longitudinal axis of the cylinder.
A circular coil with an area A=.4400m^2 is rotating in a magnetic field B=2.70T at a frequency f=60Hz. what is the peak Emf induced in the coil
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