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A company is developing a new hard plastic material to replace glass in home windows.
a) For a standard glass window (2 feet wide, 3 feet high, 1/4 " thickness), determine the heat flow rate if the outside temperature is 15°C higher than the inside temperature.
b) Find what conductivity should the plastic material have if it reduces the heat flow to 400 Watt under the same conditions?
A family ice show is held in an enclosed arena. The skaters performto music playing at a level of 76.0 dB. What total sound intensity engulfs you
A charge of -5.29 nC is uniformly distributed on a thin square sheet of non conducting material of edge length 23.3 cm. What is the surface charge density of the sheet?
A battery charger is connected to a dead battery and delivers a current of 7.4 A for 5.3 hours, keeping the voltage across the battery terminals at 12 V in the process. How much energy is delivered to the battery?
An 18-gauge copper wire (diameter 1.02 mm) carries a current with a current density of 1.60×106A/m2. Calculate the drift velocity of electrons in the wire
while trying out for the position of pitcher on your high school baseball team you throw a fastball at 77.5 mih toward
A uniform solid sphere rolls down an incline. (a) What must bethe incline angle if the linear acceleration of the center of the sphere is to have a magnitude of 0.10g?
you have two capacitors one with capacitance 10.5 of and the other of unknown capacitance. you connect the two
Describe "acceptance ratio" as a percentage of accepted trials. Simulation shows that acceptance ratio is higher on higher temperature (behave as increasing function of temperature).
a child swings a mass on a string in a horizontal circle 1.2 meter off the ground. The string has a length of 0.6 meters, how far will the mass travel before it lands
a 100 MeV particle decays into two particles. one of these two particles has a mass of 10 MeV and a speed of 3/5. a) what are the mass and speed (in the initial particle rest frame) of the second particle
A hunter aims directly at a target (on the same level) 150 m away. If the bullet leaves the gun at a speed of 220 m/s, by how much will it miss the target
A 90.6-kg climber is scaling the vertical wall of a mountain. His safety rope is made of a material that, How much is the rope stretched when it breaks his fall and momentarily brings him to rest
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