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The star-forming portion of our Galaxy consists of a highly flattened circular disk about 30 (30,000 ) in diameter. Interstellar extinction limits our view to within a radius of about 5 kpc of the Sun. If supernovae occur in the Galaxy roughly once every 30 years, on average, and are uniformly spread throughout the disk, calculate how often we should expect to see a supernova. 1-about once every 150 years 2-about once every 270 years 3-about once every 600 years 4-about once every 1100 years
In a hydrogen atom, the electron makes a transition from the n = 7 to the n = 2 state. What is the wavelength of the emitted photon
A generator has a square coil consisting of 265 turns. The coil rotates at 106 rad/s in a 0.174-T magnetic field. What is the length of one side of the coil
A high-pressure gas cylinder contains 40.0 L of toxic gas at a pressure of 1.70 ? 107 N/m2 and a temperature of 18.0°C. What is the final pressure in the tank, assuming a negligible amount of gas leaks while being cooled
a small charged bead has a mass of 3.7 . it is held in a uniform electric field 200000 up. when the bead is released
A 1.65 nC charge with a mass of 1.5 x 10-15 kg experiences an acceleration of 6.33 x 107 m/s2 in an electric field. What is the magnitude of the electric field
The distance to a star is approximately 4.2e18 m. If this star were to burn out today, in how many years would we see it disappear, How long does it take for sunlight to reach Jupiter
If gravity were switched off, the moon would move along a straight line tangent to its orbit, as described by Newton's first law. In its actual orbit in 1.00 s, how far does the moon fall below the tangent line and toward the planet
A 0.45 V potential difference is maintained across a 1.3m length of tungsten wire that has a cross-sectional area of 0.67 mm2 and the resistivity of the tungsten is 5.6 ×10−8 · m. What is the current in the wire?
The radiation pressure exerted by beam of light 1 is half the radiation pressure of beam of light 2. If the rms electric field of beam 1 has the value E_0 , what is the rms electric field in beam 2?
A certain automobile engine delivers 2.24 104 W (30.0 hp) to its wheels when moving at a constant speed of 21.0 m/s ( 47 mi/h). What is the resistive force acting on the automobile at that speed?
Two point charges of equal magnitude are d = 8.0 cm apart. At the midpoint of the line connecting them, their combined electric field has a magnitude of E =45 N/C. Find the magnitude of the charges
a ball is thrown at an angle of 30 degrees with an initial velocity of 20 ms at an elevation of 10 m. how long will it
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