A person's near point is 25 cm, and her eye lens is 2.7 cm away from the retina. What must be the focal length of this lens for an object at the near point of the eye to focus on the retina?
A) -2.4 cm B) 3.4 cm C) 2.6 cm D) -3.4 cm E) 2.4 cm
E
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The density wave theory explains spurs and branches along the spiral arms
a. True b. False Indicate whether the statement is true or false
Which of these stars lies closest to the north celestial pole on the celestial sphere?
A) Deneb B) Alpha Centauri C) Spica D) Sirius
At liftoff, the engines of the Saturn V rocket consumed 12 500 kg/s of fuel and exhausted the combustion products at 2 700 m/s. What was the total upward force (thrust) provided by the engines?
a. 3.38E+7 N b. 4.63E+6 N c. 2.16E+5 N d. 3.48E+7 N e. 3.28E+7 N
An astronaut who weighs 800 N on the surface of the Earth lifts off from planet Zuton in a space ship. The free-fall acceleration on Zuton is 3.0 m/s2 (down). At the moment of liftoff the acceleration of the space ship is 0.50 m/s2 (up). What is the magnitude of the force of the space ship on the astronaut?
a. 41 N b. 0.29 kN c. 0.24 kN d. 0.20 kN e. 0.37 kN