Dimensional Analysis: Newton's second law, F = ma, relates force F, mass m, and acceleration a. Use this equation to deduce the SI units of force.
A. kg ? m/s
B. s2 / (kg ? m)
C. m/s2
D. kg ? m/s2
E. m2/s2
Answer: D
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A nearsighted person has a near point of 12. cm and a far point of 17. cm. If the lens is 2.0 cm from the eye:
(a) what lens power will enable this person to see distant objects clearly? (b) what then will be the new near point?
The following statements refer to man-made, artificial satellites in orbit around Earth. Which is an accurate statement?
A) The velocity required to keep a satellite in a given orbit depends on the mass of the satellite. B) The period of revolution of a satellite moving about the Earth is independent of the size of the orbit it travels. C) A satellite in a large diameter circular orbit will always have a longer period of revolution about the Earth than will a satellite in a smaller circular orbit. D) It is possible to have a satellite traveling at either a high speed or at a low speed in a given circular orbit. E) Only circular orbits are possible for artificial satellites.
The charge carried by one electron is e = -1.6 × 10-19 C. The number of electrons necessary to produce a charge of -1.0 C is
A) 6.3 × 1018. B) 6.3 × 109. C) 1.6 × 1019. D) 1.6 × 109. E) none of the above
If a two–body collision is not head–on, then we may always assume that:
a. momentum is conserved. b. kinetic energy is conserved. c. neither momentum nor kinetic energy are conserved. d. both momentum and kinetic energy are conserved.