The spectral classification of stars started with the amount of hydrogen present in their spectra, but a better method now uses the amount of oxygen in the star's spectra
a. True
b. False
Indicate whether the statement is true or false
False
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Glycerin, with a viscosity of 1.50 N • s/m2, is flowing with an average speed of 1.20 m/s through a tube that has a radius of 5.00 mm and is 25.0 cm long. What is the drop in pressure between the ends of the tube?
A) 144 kPa B) 45.8 kPa C) 72.0 kPa D) 76.3 kPa E) 129 kPa
In a cooling magma, which minerals are the last to crystallize?
What will be an ideal response?
The ________ cycle of the phases of the Moon is due to the Moon's spherical shape and the ______ shining on it from different directions
a. monthly; Earth b. yearly; Earth c. monthly; Sun d. yearly; Sun
A 0.14-km wide river flows with a uniform speed of 4.0 m/s toward the east. It takes 20 s for a boat to cross the river to a point directly north of its departure point on the south bank. What is the speed of the boat relative to the water?
a. 5.7 m/s b. 8.5 m/s c. 8.1 m/s d. 7.0 m/s e. 6.4 m/s