Slanting Surfaces Without Friction: A slanted roof rises at 35° above the horizontal, and the straight-line distance from the top of the roof to the bottom edge is 4.5 m. The roof is covered with ice, so it offers no friction to objects sliding on it. A piece of ice at the top suddenly breaks loose and begins to slide down from rest.(a) How long will it take for the ice to reach the bottom edge of the roof?(b) How fast will the ice be traveling just as it reaches the bottom edge?
What will be an ideal response?
(a) 1.3 s (b) 7.1 m/s
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One end of a rope is pulled with 100 N, while the opposite end also is pulled with 100 N. The tension in the rope is
A) 0 N. B) 50 N. C) 100 N. D) 200 N.
Most of the matter in the universe is in the
A) solid phase. B) liquid phase. C) gaseous phase. D) plasma phase. E) none of the above
Some people wish that we lived in a recollapsing universe that would eventually stop expanding and start contracting. For this to be the case, which of the following would have to be true (based on current understanding)?
A) Dark energy is the dominant form of energy in the cosmos. B) Dark energy does not exist and there is much more dark matter than we are aware of to date. C) Neither dark energy nor dark matter really exist. D) Dark energy exists but dark matter does not.
What will happen in the Sun immediately after it has exhausted its supply of hydrogen in its core?
A) The core will collapse and a supernova will result. B) The Sun will turn into a white dwarf and cool off forever. C) The helium core will shrink, heat, and start fusing helium to carbon. D) The helium core will shrink and heat; a shell of hydrogen will start fusing.