If you shout across a canyon and the echo returns in four seconds, how far away is the other side? (Velocity of sound in air is 300 m/s)
a. 150 b. 300 c. 600 d. 1200 e. 2400 meters
c
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Slanting Surfaces With Friction: A 6.0-kg box slides down an inclined plane that makes an angle of 39° with the horizontal. If the coefficient of kinetic friction is 0.40, at what rate does the box accelerate down the slope?
A. 3.1 m/s2 B. 3.4 m/s2 C. 3.7 m/s2 D. 4.1 m/s2
The symbols Z, A, and N respectively stand for
A) neutron number, atomic mass number, atomic number. B) atomic number, atomic mass number, neutron number. C) atomic number, neutron number, atomic mass number. D) atomic mass number, atomic number, neutron number. E) atomic mass number, proton number, nucleon number.
An atom has more protons than electrons. The atom is
A) a negative ion. B) a positive ion. C) an insulator. D) a conductor. E) a semiconductor.
Which of the following characteristics are held in common by both gravitational and electrostatic forces when dealing with either point masses or charges?
a. potential energy is a function of distance of separation b. forces are conservative c. inverse square distance law applies d. all of the above choices are valid