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a) Describe two applications where lenses are used. What does the lens do in each of these cases?
b) Draw a diagram showing how a camera lens forms an image of a distant object on the film. Explain what is done to obtain clear pictures of far and near objects using a camera.
c) How is an eye similar to a camera? What mechanism in the eye helps us to see far and near objects clearly? Draw diagrams to illustrate.
the propeller of a light plane has a length of 1.752 m and a mass of 19.96 kg. the rotational energy of the propeller
You have a grindstone ( a disk) that is 80.0 kg, has a .349-m radius, and is turning at 104.0 rpm, Calculate the angular acceleration of the grindstone
Car B, of mass m, is initially heading east at unknown speed. The cars slide together after colliding at an angle ? away from north.
As your bus rounds a flat curve at constant speed, a package with mass 0.900kg, suspended from the luggage compartment of the bus by a string 50.0cm long, What is the speed of the bus
king arthurs knights fire a cannon from the top of the castle wall. the cannonball is fired at a speed of 54 ms and an
As part of a carnival game, a 0.503-kg ball is thrown at a stack of 15.8-cm tall, 0.383-kg objects and hits with a perfectly horizontal velocity of 10.8 m/s. what is the moment of inertia of the object
question 1for a blackbody the frequency at which maximum energy is emitted is 3 x 1013 hz a. give a wavenumber for
find the coefficient of kinetic friction between the crates and the table.
A bubble is held at a radius of 250 m. The transmural pressure difference is 2 mmHg. What is the tension in the wall
A playground merry-go-round has a disk-shaped platform that rotateswith negligible friction about a vertical axis. The disk has a massof 200 kg and a radius of 1.9 m. A 34- kg child rides at the centerof the merry-go-round while a playmate sets it..
Determine what is the instantaneous power, at a time of 0.00550 seconds, dissipated by a 200 Ω resistor in a resonant AC circuit powered by a generator
What is the total energy of a 15-kg mass attached to a spring oscillating horizontally with an amplitude of 20 cm and an angular frequency of 32 rad/s
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