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1. To correct hyperopia (far sightedness), convex lenses are prescribed. If a senior citizen can read a newspaper only when he holds it no closer than 50 cm away, what focal length of lens should be prescribed so he can read when he holds the book 25 cm away?
2. To correct myopia (nearsightedness), concave lenses are prescribed. If a student can read her physics book only when she holds it no further than 18 cm away, what focal length of lens should be prescribed so she can read when she holds the book 35 cm away?
Find the rms current, phase angle and rms voltage across R & L, in an RL circuit when a 58 Hertz 123 Volt rms ac voltage is applied, where R=1.80 kΩ and L=350 mH
an undiscovered planet many light-years from earth has one moon which has a nearly circular periodic orbit. if the
How much heat was added to the gas - what is the change in the internal energy of the system is the pressure is again constant at 2.0 atm - Show the intermediate calculation values of a,b,m and a(T))
A large pot is placed on a stove and 1.2 kg of water at 14°C is added to the pot. The temperature of the water is raised evenly to 100°C just before it starts to boil. What amount of heat is absorbed by the water in reaching 100°C
A particular heat engine has a useful power output of 4.80 kW and an efficiency of 25.0%. Find the energy taken in during each cycle
Suppose 1500 J of heat are added to 5.6 mol of argon gas at a constant pressure of 120 kPa. Calculate the change in volume of the gas
In the H atom the radius of orbit B is 16 times greater than the radius of orbit A. What is the total energy of the electron in orbit B
An incandescent lightbulb has a tungsten filament that is heated to a temperature of 4.00 x103 K when an electric current passes through it. If the surface area of the filament is approximately 1.00 x 10-4 m2 and it has an emissivity of 0.42, what is..
An isolated conductor of arbitrary shape has a net charge of +1.10×10-5 C. Inside the conductor is a cavity within which is a point charge q = +4.40×10-6 C. obtain the charge on the outer surface of the conductor
In a house the temperature at the surface of a window is 16°C. The temperature outside at the window surface is 9°C. Heat is lost through the window via conduction, and the heat lost per second has a certain value.
A horizontal force of 109 Newton pushes an 8 kilogram block up a frictionless incline that creates an angle of 23 degree with the horizontal. Find what is the acceleration of the block
Calculate the speed of an electron that is accelerated through the same potential difference
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