Chinese astronomers observed supernovae, and called them _______________ stars

Fill in the blank(s) with correct word


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Physics & Space Science

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Raindrops are falling straight downward. When observed from a car traveling at 55.0 mi/h, the drops streak the side window at an angle of 60.0° with the vertical. Find the speed with which the drops are falling

Physics & Space Science

The critical angle for glass in air if the glass has index of refraction 1.50 is

A) 41.8°. B) 85.9°. C) 56.3°. D) 90°. E) 48.1°.

Physics & Space Science

Which of the following is an example of the type of force that acts at a distance?

a. gravitational b. magnetic c. electrical d. all of the above

Physics & Space Science

What is the wavelength of a photon emitted when an electron in hydrogen goes from the n = 4 state to the n = 1 state?

A. 323 nm B. 156 nm C. 121 nm D. 103 nm E. 97.3 nm

Physics & Space Science