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Two polarizers are oriented at 38 deg to one another. Lightpolarized at a 19 deg angle to each polarizer passes through both. What percent reduction in intensity takes place?
q1.a bat in a cave emits a sound pulse and receives an echo 0.22 second later. assuming that the speed of sound is 339
A doubly charged helium atom whose mass is 6.6 *10^-27 is accelerated by a voltage of 3000 V. What is its period of revolution
A 25 horsepower motor consumes 21 kW of electricity, Calculate the heat loss of the motor (kW) and Calculate the efficiency of the motor
A 300g ball swings in a vertical circle at the end of a 1.3-m-long string. When the ball is at the bottom of the circle, the tension in the string is 12N
A house has a floor area of 104 m2 and an outside wall that has an area of 32 m2. Calculate the magnetic flux that passes through the floor
A lead bullet (? = 11.3 X 103 kg/m3) is placed in a pool of mercury (? = 13.6 X 103 kg/m3). What fractional part of the volume of the bullet is submerged
A bike rider approaches a hill at aspeed of 8.5 m/s. The combined mass of the bike and the rider is85.0Kg. choose a suitable system. find the initial kinetic energyof the system. the rider coasts up the hill. assuming there is nofriction, at what ..
A block is on a plane inclined at 75 degrees with a coefficient of static friction of 0.1. what is the minimum necessary magnitude of the force to keep it stationary
A rectangular loop lies next to a long straight wire, on the same plane. Both wires carry a current of 3A. find the magnitude and the direction of the net force on each loop
A large, flat, horixontal sheet of charge has a charge per unit area of 8.5%u03BCC/m^2. Find the electric field just above the middle of the sheet
Calculate the energy of the electron in the ground state of triple ionized beryllium, which has an atomic number Z = 4
Standing on the surface of planet zork (which has mass M_z and radius R_z) you throw a rock(mass m straight up). At what speed was it thrown
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