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A stargazer has an astronomical telescope with an objective whose focal length is 185 cm and an eyepiece whose focal length is 1.20 cm. He wants to increase the angular magnification of a galaxy under view by replacing the telescope's eyepiece. Once the eyepiece is replaced, the barrel of the telescope must be adjusted to bring the galaxy back into focus. If the barrel can only be shortened by 0.40 cm from its current length, what is the best angular magnification the stargazer will be able to achieve?
An electron orbiting a hydrogen atom has an initial energy of -0.544 eV. The atom emits a photon, then absorbs a photon, What was the wavelength of the emitted photon
On a nice winter day at the South Pole, the temperature rises to ?63°F. What is the approximate temperature in degrees Celsius
A proton with an initial velocity of (1.0x + 2.0y + 3.0z) x 10^5 m/s enters a megnetic field of 0.50z T. Find the magnitude of the force on the proton. The mass of the proton is 1.67 x 10^-27 kg.
A hydraulic system uses a large piston with a 1-m radius and a small piston with a 0.10-m radius. If the smaller piston is displaced two meters then how far is the larger one displaced
A crate of mass 10.6 kg is pulled up a rough incline with an initial speed of 1.52 m/s. What is the change in kinetic energy of the crate
a block is at rest on the incline shown in the figure. the coefficients of static and kinetic friction are mus 0.75
Three electrons are aligned on a straight line and separations between them are 1.0mm. What is the electric potential energy of the center electron
if the current through a loop radius 50 cm is 2A, what is the magnetic field produced by the loop wire
The energy momentum relationship for the conduction band of a 3D semiconductor is: E= (h bar)^2/2m*[k(x)^2/2+k(y)^2+k(z)^2]
describe why pluto was demoted from the planet status. be sure to describe what class of planetoid it is considered now
A gymnast with mass m1 = 49 kg is on the balance beam that sits on (but is not attached to) two supports. The beam has a mass m2 = 126 kg and length L = 5 m. Each support is 1/3 of the way from each end. Initially the gymnast stands at the left en..
An elderly sailor is shipwrecked on a desert island, but manages to save his eyeglasses. What is the magnifying power of the telescope he can construct with these lenses
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