A jet airplane flies at a constant velocity through the air. Its jet engines exert a constant force forward on the plane that exactly balances the force of air friction exerted backward on the plane. These forces are equal in magnitude and opposite in direction. Do we know this because of Newton’s second law or Newton’s third law?
A. Newton’s second law
B. Newton’s third law
C. Both laws
D. Neither (explain)
A. Newton’s second law
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Venus is located
A) near the outer boundary of the Sun's habitable zone B) in the middle of the Sun's habitable zone C) near the inner boundary of the Sun's habitable zone D) outside the Sun's habitable zone
A bullet is dropped into a river from a very high bridge at the same time as another bullet is fired straight downward from a rifle. Neglecting air resistance, the acceleration just before striking the water is
A) greater for the dropped bullet. B) greater for the fired bullet. C) the same for each bullet. D) none of the above
Quasars are radio sources that look like stars in visible-light photographs
a. True b. False Indicate whether the statement is true or false
What extrasolar planet discoveries were initially surprising?
A) Jupiter-like planets orbiting very close to their stars B) planets with large eccentricities C) systems with only one planet D) A and B E) A and C F) B and C