Which of the following is an example of a physical change but not a chemical change?
a) the...
Which of the following is an example of a physical change but not a chemical change?
a) the log gives off heat and light as it burns
b) a tree stores energy from the sun in its fruit
c) a penny lost in the grass slowly changes color
d) a water pipe freezes and cracks on a cold night
Answers: 3
Physics, 22.06.2019 02:10, lolsmaster3951
Which statement correctly describes the relationship between frequency and wavelength?
Answers: 2
Physics, 22.06.2019 11:20, cjd1214812148
The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)
Answers: 3
Physics, 22.06.2019 19:50, aliami0306oyaj0n
State the below theories and give the name of the writer of the theory 1. wave theory 2. quantum theory 3. corpuscular theory 4. electromagnetic theory
Answers: 1
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