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You focus sunlight on a piece of paper and find that the spot is 1 cm in diameter if the paper is placed 20 cm from the lens, and again if the paper is placed 30 cm from the lens. What is the focal length of the lens in cm? The focal length of the lens is ____ cm.
When a potential dissimilarity of 138 V is applied to the plates of an air-filled parallel-plate capacitor, the plates carry a surface charge density of 4.00*10-10 C/c m2. What is the spacing among the plates?
A car is driven 225 km west and then 78 km southwest (45 degrees). What is the displacement of car from the point of origin (magnitude and direction).
A circuit consists of an idealized 191 mH in- ductor and a 25.4 µF capacitor. calculate the maximum energy stored in the inductor
A roller coaster at an amusement park has a dip that bottoms out ina vertical circle of radius r. A passenger feels the seat of thecar pushing upward on her with a force equal to twice her weight asshe goes through the dip. If r = 20.0 m, how fast..
A 800 N box is lowered from rest by a crane. If it travels 12 meters downward in 10 seconds, what is the tension in the cranes cable
a 9.0 microf capacitor is charged by a 11.0 v battery through a resistance r. the capacitor reaches a potential
a roller-coaster car has a mass of 504 kg when fully loaded with passengers point a is the bottom portion of roller
a liquid of unknown specific heat at temperature 20c was mixed with water at 80c in a container.final temperature was
A motor having an efficiency of 88% operates a crane having an efficiency of 42%. With what constant speed does the crane lift a 410-kg crate of machine parts if the power supplied to the motor is 5.5 kW?
What are the bound charge densities inside and outside of a neutralsphere of linear dielectric with radius R with permittivityε1 placed in an infinite neutral linear dielectricfluid with permittivity ε2?
A 100uF capacitor is charged to a potential difference of 50 Volt. Find how much energy is stored
A solenoid 1.3 meter long and 2.6 centimeter in diameter carries a total current of 18 A. Obtain the length of the wire forming the solenoid and show work please
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