An observer in the Southern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
D
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The sun will eventually become a supernova
Indicate whether the statement is true or false
Refracting Telescope: A person is designing a telescope with a magnification of 10. If the telescope is limited to a length of 0.20 m, what is the approximate focal length of the objective?
A. 16 cm B. 17 cm C. 18 cm D. 19 cm
Force on a Moving Charge: An electron moves with a speed of 8.0 × 106 m/s along the +x-axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x-axis and lying in the xy-plane. Calculate the magnitude of the acceleration of the electron. (e = 1.60 × 10-19 C, me1 = 9.11 × 10-31 kg)
A. 1.3 × 1018 m/s2 B. 3.0 × 1018 m/s2 C. 1.3 × 10-18 m/s2 D. 3.0 × 10-18 m/s2 E. 0 m/s2
Research suggests that lead exposure leads to irremediable results, so that the best way to reduce lead levels is to remove lead-based materials. How realistic is such a tactic? Explain
What will be an ideal response?