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A telescope is constructed from two lenses with focal lengths of 90.0cm and 20.0cm , the 90.0?cm lens being used as the objective. Both the object being viewed and the final image are at infinity.
Find the angular magnification for the telescope.
Find the height of the image formed by the objective of a building 60.0 m tall, 3.50km away.
What is the angular size of the final image as viewed by an eye very close to the eyepiece?
When a guitar string is sounded along with a 441-Hz tuning fork, a beat frequency of 4.00 Hz is heard. When the same string is sounded along with a 437-Hz tuning fork, beat frequency is 8.00 Hz. What is the frequency of the string.
About once every 30 minutes, a geyser known as Old Faceful projects water 18.0 m straight up into the air. Use g = 9.80 m/s2, find the speed of the water when it emerges from the ground
Your 300 ml cup of coffee is too hot to drink when served at 92C.What is the mass of an ice cube, taken from a -19C freezer, that will cool your coffee to a pleasant 61C.
A 40ton rail car and a 80ton rail car, initially at rest, are connected together with a giant but massless compressed spring between them. When released, What is the speed of the 40ton car relative to the ground
Medical labs often use centrifuges to separate the different components of blood or tissue. Find the acceleration of a blood sample 0.14 m from the center of a centrifuge rotating at 230 revs/min
I lift a 3 kg rock up and place it on a table 2 meters above the ground. How much gravitational potential energy does the rock have
Suppose you are listening to the WKAR FM radio station on a car radio. The carrier frequency of the transmission is 90.5 MHz. Calculate the wavelength of the carrier wave
A 36-kg skier coasts up a snow-covered hill thats makes anangle of 25o with the horizontal. what is the magnitude of the kinetic frictional force
Converting sunlight to electricity with solar cells has an efficiency of 15%. It's possible to achieve a higher efficiency (though currently at higher cost) by using concentrated sunlight as the hot reservoir of a heat engine. What is the theoreti..
A moving particle encounters an external electric field that decreases its kinetic energy from 9910 eV to 6840 eV as the particle moves from position A to position B.
A circular-motion addict of mass 85 kg rides a Ferris wheel around in a vertical circle of radius 10 m at a constant speed of 6.0 m/s. (a) What is the period of the motion
A string with a length of 0.7 m is fixed at both ends. What is the longest possible wavelength for the traveling waves that can interfere to form a standing wave on this string
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