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A positive lens of focal length 40 cm is placed 20 cm behind a negative lens of focal length -80 cm. An object is placed 240 cm in front of the negative lens. The final image distance relative to the positive lens is:
What is the maxium power that can be supplied by the outlets without blowing the fuse? How many 1,200 W appliances can be plugged into thesockets without blowing the fuse?
A woman with a mass of 55.0kg is standing on the rim of a large disk that is rotating at an angular velocity of 0.470rev/s, Calculate the magnitude of the total angular momentum of the woman-plus-disk system
A 65 man's arm, including the hand, can be modeled as a 76 -long uniform cylinder with a mass of 3.4. by how much does he raise his center of gravity?
A 1500 ft2 wall has an R-value of 11.0 hr.oF.ft2/Btu, including the effects of the interior and exterior air layers. How many Btus are lost through this wall
Two 32.4-cm metal rods, one made of copper and one made of aluminum, are placed end to end, touching each other. How far does the other end of the system of rods move
A Carnot engine operating with an ideal gas takes heat energy from the hot reservoir at 500 degrees C and exhausts heat energy to the cold reservoir at 250 degrees C. If the engine does 400J of work per cycle, what is its efficiency.
An undamped oscillator has period 0 = 1.000 seconds, but I now add a little damping so that its period changes to 1 = 1.001 seconds. What is the damping factor ? By what factor would the amplitude of oscillation decrease after 10 cycles.
A train is traveling at 30m/s relative to the ground in still air. What frequency, (f.approach), is heard by a passenger on a train moving at a speed of 18m/s relative to the ground
A proton starting from rest is accelerated in a cyclotron to a speed of 3.0•106 m/s. Find the work done on a proton by the electrical force of the cyclotron.
You are standing on a platform and you throw a 5kg ball horizontally with a speed of 10m/s. Find the time it takes the ball to hit the ground
In soccer, a speed record was set for kicking a soccer ball at 43m/s. If the soccer player kicked the ball from ground level at an angle of 30° from the horizontal, what would be the flight time of the soccer ball? Assume that air resistance is ne..
A circular loop carrying a current of 1.0A is oriented in a magnetic field of 0.35 T. What is the torque on the loop when its plane is oriented at a 25 degree angle to the field
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