Which of the following best describes the development of astronomical telescopes over the past 60 years?
A) Over the 60-year period, telescopes have gradually gotten bigger and more powerful.
B) Although there have been advances in cameras and computing power, telescopes themselves have not changed much in the last 60 years.
C) The world's most powerful telescope remained the same for most of this period, but in the past 20 years many new and more powerful telescopes have been built.
D) The only major change in telescope power has occurred because of our ability to launch telescopes into space rather than operating them only from the ground.
C
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The highest frequency of visible light is
A) red. B) green. C) blue. D) violet. E) all the same
How many joules of energy are required to accelerate one kilogram of mass from rest to a velocity of 0.866 c?
A) 1.8 × 1017 J B) 9.0 × 1016 J C) 4.5 × 109 J D) 3.0 × 103 J E) none of the given answers
A homogeneous cylinder is released from rest and rolls without slipping down an inclined plane inclined at 18° to the horizontal. How fast is it moving after it has rolled 2.2 m down the plane?
A) 4.3 m/s B) 5.2 m/s C) 3.0 m/s D) 3.7 m/s E) 2.6 m/s
How were the heavier elements that we have on earth produced?
a) They have always been here so they were never produced b) all elements were produced in the Big Bang c) all the heavy elements on earth were produced by our Sun at the center of our solar system and some elements are also produced by plants d)By nuclear fusion and nuclear synthesis processes in stars that predated our Sun and nuclear processes that occur when the stars undergo a supernova