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1. Consider heat loss through the two walls of a house on a winter night. The walls are identical, except that one of them has a tightly fit glass window. Through which wall will the house lose more heat? Explain.
2. Which is a better heat conductor, diamond or silver?
aluminum has a density of 2700 kgm3. what is the resistance of an aluminum wire 0.12 cm in diameter and 80 m long? what
A member of an aircraft maintenance crew wears protective earplugsthat reduce the sound intensity by a factor of 380. When a jetaircraft is taking off, the sound intensity level experienced bythe crew member is 84 dB.
A bungee cord is stretched between two poles with a force of 357 N. What is the velocity of a wave on this bungee cord
According to Kepler's harmonic law, how are the period and semimajor axis of a planet related? What's the difference between inferior and superior planets? What is the difference between an inferior conjunction and a superior conjunction?
A layer of oil (n = 1.45) floats on an unknown liquid. A ray of light originates in the oil and passes into the unknown liquid. What is the index of refraction of the unknown liquid
a 3.3t magnetic field makes a 45 degree angle with a square loop 32cm on a side. whats the magnetic flux through the
A 64.0-kg runner has a speed of 5.50 m/s at one instant during a long-distance event. What is the runner's kinetic energy at this instant
From the Bohr model of the Hydrogen atom, calculate the minimum amount of energy (in eV) an electron in the lowest orbital would need to free it from its proton (i.e., to ionize the atom).
Suppose a simple pendulum is used to measure the acceleration due to gravity at various points on the Earth. find the corresponding variation in the period of the pendulum
A star rotates about its axis through a diameter once in 50 days. At the end of its life the star collapses to one hundredth of its orginal diameter. What will the rate of rotation of the collapsed star be?
A ball of clay of mass m travels with velocity v in a path tangent to a disk of Radius R and mass M. What is the final angular speed of the clay and disk
An oscillator consists of a block attached to a spring (k = 475 N/m). At some time t, the position (measured from the system's equilibrium location), velocity, and acceleration of the block are x = 0.420 m, v = -11.9 m/s, and a = -139 m/s2. a)Calcula..
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