In order to conserve fuel, you modify your car by removing 100 kg of excess weight. How much energy is saved each time you drive up a 3 km high mountain?
a. 
b. 
c. 
d. 
c.
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Aluminum (Group III) and silicon (Group IV) are adjacent to each other in the periodic table. Relative to aluminum silicon is less dense, has a higher melting temperature, is harder, and is very prevalent in the sand and rocks of the Earth’s crust. And yet aluminum has many more mechanical applications, such as in the structure and skin of aircraft, the cylinder heads in automobile engines, small boats, and marine engines. We will cover this later in the book, but from what you know about metals, such as aluminum, what property results in the use of aluminum in these applications rather than silicon?
What will be an ideal response?
What is the observational difference between Types I & II supernovae?
A: Ia's come from white dwarfs in binaries whereas II's come from dying massive stars B: I's are brighter than II's C: I's are fainter than II's D: I's are Hydrogen poor while II's are Hydrogen rich E: I's have no central remnant while II's have neutron stars
The majority of dark matter is probably not protons and neutrons
Indicate whether the statement is true or false
When I stand halfway between two speakers, with one on my left and one on my right, a musical note from the speakers gives me constructive interference. How far to my left should I move to obtain destructive interference? Select one:
a. one-fourth of a wavelength
c. one wavelength
b. half a wavelength
d. one and a half wavelengths