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Q1. The brick wall (of thermal conductivity 0.91 W/m*degrees C) of a building has dimensions 2.9 m by 6 m and is 18 cm thick. How much heat flows during the wall in a 6.9 hour period when the average inside and outside temperature are, in that order, 25 degrees C and 2 degrees C? respond in units of MJ
Q2. A stone takes 0.28s to travel past a window 2.2m tall. From what height above top of the window did the stone fall?
A 4.0-kg object has a velocity of 4.0 m/s headed east. An explosion causes it to break up into two smaller 2.0-kg objects. what is the velocity of the other object after the explosion
To stop a car, first you require a certain reaction time to begin braking; then the car slows under the constant braking deceleration. determine the magnitude of the deceleration
how much weight must each man support. by how much would the temperature of the air rise over a period of 2.0 h due to the metabolism of the people.
A uniform electric field of magnitude 249 V/m is directed in the negative y direction. A +13.4 ?C charge moves from the origin to the point (x, y) = (15.0 cm, 50.8 cm)
Drawing on Erastothenes' method, if two observers are due north and south of each other and are separated by 490 km, what is the circumference of their spherical world if they see the same star on their meridian at altitudes of 29 degrees and 45 degr..
A pipe open at one end has a fundamental frequency of 256 Hz. A second pipe,identical to first pipe, is shortened by cutting off a portion of the open end. When both pipes vibrate at their fundamental frequencies, a beat frequency of 12 Hz is heard..
A hydrogen atom is in its second excited state (n = 3). calculate angular momentum of the electron
A block of mass 200g, sliding with a speed of 12 cm/sec on a smooth level surface, makes a head-on, elastic collision with a block of unknown mass, Determine the mass of the second block
Two power supplies are connected in series. The maximum voltage of each power supply is8.3V and 15.0V respectively, what is the resulting maximum voltage produced by the supplies
An electron is traveling through a region of space in which the electric field is along the +x direction, What is the acceleration of the electron
An ac generator with a frequency of 1.44kHz and an rms voltage of 24.2V is connected in series with a 2.10 kilo-ohm resistor, What is the average power consumed by this circuit
A research submarine has a 40.0cm -diameter window 8.30cm thick. The manufacturer says the window can withstand forces up to 1.10×106N
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