Voyager 2 should reach the nearest stars (besides the Sun) in about 500 years
Indicate whether the statement is true or false
FALSE
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If one were told the object's initial velocity then one could calculate the work done by using the equations for constant acceleration to find the distance traveled. When we say work is done by a force, we mean the force does
a. all the work c. negative work b. positive work d. zero work
Hot gas created during the big bang should be detectable becausethe ____
a. gas has traveled with galaxies as they formed and is spread through the Universe of the present day b. big bang occurred everywhere at once, and should be visible in any direction at long look-back times c. big bang occurred in a certain location, and the radiation from the gas is concentrated there d. gas has travelled to the edges of the Universe and will be visible at negative redshifts e. radiation emitted by the gas has travelled at the same speed as the expanding Universe and is visible all around us
Oxygen has atomic number 8. How many times must an oxygen atom be ionized to create an O+5 ion, and how many electrons will the ion have?
A) It must be ionized three times; it now has five electrons. B) It must be ionized five times; it now has five electrons. C) It must be ionized five times; it now has three electrons. D) It doesn't have to be ionized; it just needs to gain five protons. E) It doesn't have to be ionized; it already has only three electrons.
The intensity level of an orchestra is 85 dB. A single violin achieves a level of 70 dB. How does the intensity of the sound of the full orchestra compare with that of the violin?