In the Big Bang, about 75% of the normal matter by mass was hydrogen atoms, and the other 25% almost entirely helium
Indicate whether the statement is true or false
TRUE
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A catapult is tested by Roman legionnaires. They tabulate the results in a papyrus and 2000 years later the archaeological team reads (distances translated into modern units): Range = 0.20 km; angle of launch = ?/4; landing height = launch height
What is the initial velocity of launch of the boulders if air resistance is negligible? A) 44 m/s B) 1.4 m/s C) 22 m/s D) 0.69 m/s
The ____________________ contains a large amount of gas and dust and a great number of stars, and our Sun is one of those stars
Fill in the blank(s) with correct word
What is the focal length of a magnifying glass that produces an angular magnification of 7.0 x when used by a person with a near point at 28 cm?
A) 2.0 cm B) 3.0 cm C) 4.0 cm D) 5.0 cm E) 6.0 cm
What is the power factor of an RLC series circuit with an inductive reactance of 174 ?, a capacitive reactance of 60 ? and a resistance of 100 ??
A) 0.29 B) 0.46 C) 0.56 D) 0.66 E) 0.76