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The objective lens of the refracting telescope at the Lick Observatory in California has a focal length of 57 ft.
What is the refractive power of this lens?
A 66 {rm kg} skier speeds down a trail, as shown in the figure . The surface is smooth and inclined at the angle of 22 ^circ with the horizontal. Find the magnitude of the net force acting on the skier.
A 11.0 cm -diameter compressed-air tank is 70.0 cm tall. The pressure at 30.0 degrees C is 130 atm. How many moles of air are in the tank
The lengths of the three telescopes are LA = 434 mm, LB = 653 mm, Find the angular magnification of each telescope
a disk is spinnning at a rate of 10 rad/s. a second disk of the same mass and shape, what is the final angular velocity of the two disks
The current in a 100 watt lightbulb is 0.85 A. The filament inside the bulb is 0.25 mm in diameter. What is the elecron current in the filament
An incompressible fluid flows steadily through a pipe that has a change in diameter. The fluid speed at a location where the pipe diameter is 8 cm is 1.28 m/s. What is the fluid speed at a location where the diameter has narrowed to 4.00 cm.
What is velocity relative to the ice surface
An 800kHz radio signal is detected at a point 6.6 kmdistant from a transmitter tower. The electric field amplitude of the signal at that point is 780mV/m. What is the magnetic field amplitude of the signal at that point
How numerous atoms does each hand contain
find What is the impulse delivered by the bat.
In an ice show a 65.0 kg skater leaps into the air and is caught by an initially stationary 85.0 kg skater. How much kinetic energy is lost?
At what energy does an electron become "relativistic"? Consider electrons with kinetic energies of 50 eV, 50 keV, and 50 MeV. When is it important to use the relativistic formulas
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