The Mars Rovers found undisputed microfossils, proving life once existed on Mars
Indicate whether the statement is true or false
FALSE
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While most neutron stars are also pulsars, an older "bare" neutron star was captured in rapid motion only 200 lightly years distant by:
A) Arecibo Radio Observatory. B) the Keck Telescopes used as an interferometer. C) the Chandra X-ray observatory. D) the Hubble Space Telescope. E) the Spitzer Infrared Space Telescope.
What electric charge is characteristic for an ion of O?
a. 6+ b. 0 c. 2– d. 2+
A 50-turn circular coil (radius = 15 cm) with a total resistance of 4.0 ? is placed in a uniform magnetic field directed perpendicularly to the plane of the coil. The magnitude of this field varies with time according to B = A sin (?t), where A = 80 ?T and ? = 50? rad/s. What is the magnitude of the current induced in the coil at t = 20 ms?
a. 11 mA b. 18 mA c. 14 mA d. 22 mA e. zero
Alpha rays can penetrate
A) air only. B) a piece of paper. C) several millimeters of aluminum. D) several centimeters of lead. E) several meters of iron.