An astronaut in a space suit has a total mass of 143.5 kg and is standing on a scale that reads in newtons inside an elevator. If the elevator accelerates upward at the rate of 1.8 m/s2, what does the scale read?
a. 703.2 N b. 1,406.3 N
c. 882.3 N d. 1,664.6 N
[Ques. 2] Two identical airplanes are executing identical turns around a pylon. One of them is moving at 200 mph, and the other is moving at 100 mph. The centripetal force acting on the airplane moving at 200 mph is __________ the value of the centripetal force acting on the airplane moving at 100 mph.
a. one quarter b. one half
c. the same as d. twice
e. four times
[Ques. 3] An aircraft weighs 1,500 N, its mass is
a. 1,500 kg. b. 750 kg.
c. 153 kg. d. mass cannot be determined
[Ques. 4] Starting from rest, a 20,000-kg aircraft being launched from an aircraft carrier goes from 0 to 90 m/s in 2 seconds. The net force acting on the aircraft is
a. 3,600,000 N. b. 1,800,000 N.
c. 900,000 N. d. 450,000 N.
e. 275,000 N.
[Ques. 5] Isaac Newton's contributions to physics include
a. the laws of motion.
b. the law of universal gravitation.
c. invention of the calculus.
d. the invention of the reflecting telescope.
e. all of the above.
[Ques. 6] The sensitive dependence upon initial conditions of the evolution of some physical systems is a feature of
a. gravitation.
b. fractals.
c. air resistance.
d. dynamical chaos.
e. quantum mechanics.
[Ques. 7] Tides are influenced by
a. the Moon.
b. the Sun.
c. the uneven surface of the Earth.
d. all of the above.
e. none of the above.
[Ques. 8] During the period of one day, the number of high tides at a given point is about
a. one.
b. two.
c. three.
d. four.
e. none of the above.
[Ques. 9] If a body were in orbit very near the surface of the Earth, its centripetal acceleration would be
a. equal to g.
b. smaller than g.
c. larger than g.
d. dependent on its mass.
e. none of the above.
[Ques. 10] How was the value of G first determined?
a. by Cavendish, using a torsion balance
b. by Etvs, using a torsion balance
c. via a gedanken experiment
d. by Newton, watching an apple fall
e. none of the above
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