A uniform piece of wire, 20 cm long, is bent in a right angle in the center to give it an L-shape. How far from the bend is the center of mass of the bent wire?
A) 2.5 cm
B) 3.5 cm
C) 4.5 cm
D) 5.0 cm
E) 7.1 cm
B
Physics & Space Science
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Which of the following aluminum alloys is not suitable for welding?
(a) 1100 (b) 3003 (c) 5052 (d) 7075-T6
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The major impact in the Yucatan wiped out the dinosaurs:
A) about 450 million years ago. B) about 200 million years ago. C) about 65 million years ago. D) about 36 million years ago. E) less than 2 million years ago.
Physics & Space Science
You ride a motor scooter 8 km in 15 minutes. Your [average] speed is
A) 16 km/hr. B) 2 km/hr. C) 4 km/hr. D) 32 km/hr. E) 48 km/hr.
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The problem with visual observations of our Galaxy is the luminous gas haze
Indicate whether the statement is true or false
Physics & Space Science