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The Milky Way galaxy rotates once in 200 million years, and our sun is located about 30,000 light years from the galactic center. As a result, the Earth is moving through space relative to the other galaxies. What is the observed Doppler shift in Å of the hydrogen line of 6563 Å for light coming from other galaxies? Consider two cases:
a. The line of observation is in the direction of the Earth's motion;
b. The line of observation is perpendicular to the direction of the Earth's motion.
Ignore other causes of observed Doppler effects.
During a lightning flash, there exists a potential difference of V(Cloud)-V(Ground)=1.2 x10^9V between a cloud and the ground. As a result, a charge of -25 C is transferred from the ground to the cloud.
If the piston has a cross sectional area of 0.0100 m^2 and negligible mass, how high would it rise when the temperature is raised to 250°C.
You sing into a well and find that the well resonates at frequencies of 198 Hz and 234 Hz with no resonances between these two frequencies. What is the frequency of the fundamental mode
A small block with a mass of 0.120kg is attached to a cord passing through a hole in a frictionless, horizontal surface. The block is originally revolving at a distance of 0.50 m from the hole with a speed of 0.70m/s. The cord is then pulled from ..
An insect sit's on the edge of a spinning record that has aradius of .15m. What is the insect's acceleration
Lawn spheres placed on a pedestals are convex mirrors. Onesphere has the diameter of 37 cm. What is the height of the bird's image
A wooden cube of side .3 m has a density of 700kg/m3 and floats partiall submerged in the seawater (density =1025 kg/m3) What distance from the bottom of the cube to the surface of the water? How much extra mass must be added so that the top of the c..
It is desired to construct a solenoid that will have a resistance of 6.00 (at 20°C) and produce a magnetic field of 4.00 10-2 T at its center when it carries a current of 4.80 A. estimate the length the solenoid should have
Suppose an old flashlight battery shows a voltage of 1.45 V when the probes of a voltmeter are placed across it. What is the current when the resistor is hooked up
A cart with mass 380 g moving on a frictionless linear air track at an initial speed of 0.9 m/s undergoes an elastic collision with an initially stationary cart of unknown mass. After the collision, the first cart continues in its original direction ..
Light with a photon energy of 4.5 eV impinges on the surface of a material with work function 0.4 eV to eject electrons
A harpsichord string of length 1.65 m and linear mass density 24.4 mg/m vibrates at a (fundamental) frequency of 445 Hz. What is the speed of the transverse string waves
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