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In a classroom demonstration, a 79.2-kg physics professor lies on a "bed of nails." The bed consists of a large number of evenly spaced, relatively sharp nails mounted in a board so that the points extend vertically outward from the board. While the professor is lying down, approximately 1950 nails make contact with his body. If the area of contact at the head of each nail is 1.26 × 10 -6 m2, what is the average pressure at each contact?
A 3.0 kg mess kit sliding on a frictionless surface explodes into two 1.5 kg parts, one moving at 2.1 m/s, What is the original speed of the mess kit
Suppose the earth were made entirely of hydrogen and oxygen, with two atoms of hydrogen for each atom of oxygen. how long could the earth produce the same luminosity as the Sun
Two metal balls A and B of negligible radius, connected by a taut nonconducting thread of length 1.30 m, are floating at rest on Space Station Freedom between two metal bulkheads.
The main water line enters a house on the first floor. The line has a gauge pressure of 2.30 105 Pa. What is the gauge pressure at this faucet
q1. an ocean liner leaves new york city and travels 37.0deg north of east for 171 km. how far east and how far north
Suppose that earth was formed as molten rock at some very high temperatures. Estimate the time for the earth to cool to 300 K.
An L-R-C circuit has an inductance of 0.410 , a capacitance of 2.75×10?5 , and a resistance of R. What is the angular frequency of the circuit
A pulley is 1.8 meters away from the wall. A 4 meter string that has a mass of 25 grams has one end attached to the wall and the other end hung over the pulley. What is the mass of the iron
You charge an initially uncharged 62.7-mF capacitor through a 46.9-? resistor by means of a 9.00-V battery having negligible internal resistance. Find the time constant of the circuit. What is the charge of the capacitor 1.45 time constants after the..
An antique phonograph turntable has a kinetic energy of 2.70×10?2J when turning at an angular velocity of 48.0 rev/min, What is the moment of inertia of the turntable about the rotation axis
The unpolarized light of intensity I(not) is passed through two polarizers with axes oriented at 30degrees from each other. What intensity of light emerges
Two particles with masses m and 3m are moving toward each other along the x axis with the same initial speeds Vi. What is the angle theta at which the particle 3m is scattered
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