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Gravity vs. electricity *
(a) In the domain of elementary particles, a natural unit of mass is the mass of a nucleon, that is, a proton or a neutron, the basic massive building blocks of ordinary matter. Given the nucleon mass as 1.67 · 10-27 kg and the gravitational constant G as 6.67 · 10-11 m3/(kg s2), compare the gravitational attrac- tion of two protons with their electrostatic repulsion. This shows why we call gravitation a very weak force.
(b) The distance between the two protons in the helium nucleus could be at one instant as much as 10-15 m. How large is the force of electrical repulsion between two protons at that dis- tance? Express it in newtons, and in pounds. Even stronger is the nuclear force that acts between any pair of hadrons (includ- ing neutrons and protons) when they are that close together.
A gas expands from I to F. The energy added to the gas by heat is 442 J when the gas goes from I to F along the diagonal path. What is the change in internal energy of the gas.
A 369 g ball moving at -27 m/s is hit by a bat. The ball moves in the opposite direction at 35 m/s. How long did it interact with the bat if the average force was 278 N
Consider an infinite straight wire with a current i. Derive asymbolic expression for the magnetic field at a distance r from thewire, by using either Ampere's law, Biot and Savart law, to showthat this magnetic field is given by B(r)=u0i/2pir
A girl of mass m = 54 kg is pulling a sled up a slippery slope. The coefficient of friction between the boots of the girl and the slope is u_s = 0.157 kg. what is the mass of the sled
A 5 m x 12 m swimming pool slopes linearly from a 1.20 m depth at one end to a 3.40 m depth at the other. What is the mass of water in pool.
A child exerts a tangential 42.2 N force on the rim of a disk shaped merry go round with a radius of 2.40 m. what is its mass
There is evidence that elephants communicate via infrasound, generating rumbling vocalizations as low as 14 Hertz that can travel up to 10 kilometer. Compute the intensity level of the infrasound 10 kilometer from the source
A 35.0 kg person crawls across a 15.0 m long horizontal beam that has a mass of 15.0 kg. The beam has a support line that is at an angle of 65 degrees up from the horizontal.
A small circular hole 6.90 mmdiameter is cut in the side of a large water tank, 19.0 m below the water level in the tank. The topof the tank is open to the air. Find the volume discharged per unit time
For the polarizers in the figure, suppose the incident light is linearly polarized, What is the angle (in degrees) the initial direction of polarization makes with the first polarizer
A 50.0kg stunt pilot who has been diving her airplane vertically pulls out of the dive by changing her course to a circle in a vertical plane. What is the apparent weight of the pilot at the lowest point of the pullout?
Unpolarized light is incident on a series of two Polaroid sheets. The intensity of the light emerging from the second sheet is 18.4 percent of the intensity of the light incident on the first sheet. Find out the angle between the transmissions axe..
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