Critical thinking is the process of:
a. finding fault in yourself
b. unconditionally accepting information from a trusted source
c. designing a scientific experiment
d. making a hypothesis
e. judging the quality of information before accepting it
e
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Sunspots often appear in pairs
Indicate whether the statement is true or false
Two people are balanced on a seesaw. If one person leans inward toward the center of the seesaw, that person's end of the seesaw tends to
A) rise. B) fall. C) stay at the same level. D) need more information
Three identical 50-kg balls are held at the corners of an equilateral triangle, 30 cm on each side
If one of the balls is released, what is the magnitude of its initial acceleration if the only forces acting on it are the gravitational forces due to the other two masses? (G = 6.67 × 10-11 N ? m2/kg2 ) A) 4.2 × 10-8 m/s2 B) 3.7 × 10-8 m/s2 C) 1.9 × 10-8 m/s2 D) 6.4 × 10-8 m/s2 E) 2.5 × 10-8 m/s2
A 20-m long steel wire (cross-section 1.0 cm2, Young's modulus 2.0 × 10^11 N/m2), is subjected to a load of 25 000 N. How much will the wire stretch under the load?
a. 0.25 cm b. 2.5 cm c. 12.5 cm d. 25 cm e. 1.25 cm