A plane flying horizontally at a speed of 50 m/s and at an elevation of 160 m drops a package, and 2.0 s later it drops a second package. How far apart will the two packages land on the ground if effects of air resistance are negligible?
A) 100 m
B) 160 m
C) 180 m
D) 320 m
A
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A neutral atom always contains
a. the same number of protons as it does neutrons. b. the same number of electrons as it does neutrons. c. the same number of protons as it does electrons. d. twice as many protons as it does neutrons. e. twice as many neutrons as it does protons.
Which of the following gives the two main assumptions of theoretical models of galaxy evolution?
A) Hydrogen and helium filled all of space, and the entire universe had exactly the same density everywhere. B) The universe has always been expanding, and denser areas contracted to form the first stars. C) Hydrogen and helium filled all of space, and certain regions of the universe were slightly denser than others. D) The beginning of the universe is modeled after a supernova explosion, and all elements were produced by this exploding star. E) The universe was composed originally only of hydrogen, and all the other elements came from stars.
If carbonic acid (H2CO3) were to undergo ionization, what would one of the products be?
A) H- B) CO2 C) H2O D) CO3-1 E) CO3-2
Jane and Jake are looking at what happens to body 1 of mass m and body 2 of mass 2m, initially at rest, when equal forces are applied separately to the two bodies. Jake says that equal forces applied for equal times do equal amounts of work on the two bodies. Jane says that the two forces do equal amounts of work only if the two bodies move equal distances in the direction of the forces. Which
one, if either, is correct? a. Jake, because the speed of body 1 is half the speed of body 2, but m1v1 = m2v2. b. Jane, because work does not depend on mass, only on force times distance. c. Jake, because all bodies travel equal distances when equal forces are applied for equal times. d. Jane, because it takes the same time for all bodies to travel equal distances when equal forces are involved. e. Neither, because we can't compare the amounts of work done on bodies of different mass.