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Question: An achromatic lens is made of two very thin lenses, with focal lengths f1 = -28.7 cm and f2 = +20.4 cm, that are placed in contact.
What is the focal length of the achromatic lens?
A drinking straw 20 cm long and 3 mm in diameter stands vertically in a cup of juice 8.0cm in diameter. A section of straw 6.5cm long extends above the juice. A child sucks on the straw, and the level of juice in the glass begins dropping at 0.23c..
A gold prospector finds a solid rock that is composed solely of quartz and gold. Find the mass of the gold in the rock
Consider two spheres of radius a with their centers separated by a distance d>>a. Find the capacitance of the system of the two spheres
A generator with an rms voltage of 150V is connected in series to a resistor 3.25 kilo-ohm and a capacitor 3.50 microfarad. find the average power consumed by this circuit
Your beighbor has a cute Bichon-Frise puppy. assume air is 80% Nitrogen and 20% Oxygen, how many grams of air does the tire contain
A cat is trying to jump onto a countertop that is 1m tall from 0.3m away. The cat's initial jump speed (magnitude of the total initial velocity) is 10m/s
The positively charged plate of a parallel-plate capacitor has a charge equal to Q. When the space between the plates is evacuated of air, What is the dielectric constant of the material
A cart of mass 2m has a velocity of vo before itstrikes another cart of mass 3m at rest. What is the new velocity if the two carts couple and move together
A very long cylinder with radius a carries uniformly distributed volume charge density rho. the electric potential at its center is 0. Find the potential at all points outside the cylinder
q1. a 430g block slides along a frictionless surface at a speed of 0.35 ms. it runs into a horizontal massless spring
The inner and outer surfaces of a cell membrane carry a negativeand positive charge, respectively. evaluate the magnitude of the electric field in the membrane
In a student experiment, a constant-volume gas thermometer is calibrated in liquid nitrogen (?196°C ) and in boiling pentane (36.1°C). The separate pressures are 0.349 atm and 1.442 atm.
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