Determine the orbital speed, in m/s, of a satellite that circles the earth with a period of 2. 10 104 s. The mass of the earth is 5. 97 1024 kg.

What would the difference of spectral lines emitted by hydrogen gas in distant galaxies which is normally found at a wavelength of 21 cm on earth, be observed at 21.1 centimeters?

3. on your graph, the data points between the black squares are data for elements with atomic numbers 3 through 9. locate these elements on your periodic table. what term or description would you use to identify these elements with respect to the periodic table?

Explain vector addition, triangle method and parallelogram method