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19 Cards in this Set
- Front
- Back
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Centripetal force
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center-seeking force, Earth's gravitional force supplies this force for a satellite
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What formula relates voltage, current, and power?
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P=IV
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What formula relates voltage, current, and resistance?
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V=IR
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KINEMATIC EQUATIONS
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1) d= 1/2 (V0 + Vf) t
2) Vf= V0 + at 3) d= V0t + 1/2 a t^2 5) Vf^2= V0^2 + 2ad |
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How would one determine the beat frequency between two sinusoidal waves?
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By taking the difference of the two wave frequencies.
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Newton's 1st Law
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aka Law of Inertia
An object's state of motion-its velocity-will not change unless a force acts on the object. -if the object is at rest, it will remain at rest -if the object is moving, then it will continue to move with constant velocity (constant speed in a straight line) |
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Newton's 2nd Law
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F=ma
-object can be accelerating in the direction of Fnet, but not moving in direction of (velocity in direction of) Fnet |
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Fgrav=?
and when w=mg=Fgrav |
Fgrav= (GMm)/r^2
g=(GM)/r^2 |
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Newton's Third Law
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Forces in opposite directions, acting on different objects
-form an action-rxn pair -if different masses, accelerations will be different, but this is the EFFECT of the forces and 3rd law only concerns itself w/the rxn, not the effects |
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DOES Fnet=0 mean that v=0?
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Not necessarily. Fnet=0 means that an object won't accelerate--can still be moving, but velocity is NOT changing
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Does the weight or mass of an object differ on another planet?
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It's mass is ALWAYS constant. It's weight, however, changes.
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F gravitational=
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GMm/ r^2
-remember: this is a pulling force (not pushing!) |
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Kinetic vs. Static Friction
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Kinetic friction- when there is relative movement between the surfaces
Static friction- greater than coefficient of kinetic friction b/c capable of being stronger, when there is no relative movement between the surfaces in contact (no sliding) |
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Acceleration on an inclined plane=
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g sin (theta)
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PURINES VS. PYRIMIDINES
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purine- guanine & adenine
pyrimidine- cytosine, uracil, & thyamine |
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What is a nucleoside?
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A ribose with purine or pyrimidine linked to the 1' C in a B-N glycosidic linkage
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In dilute solution, adenine and thymine will H bond to each other or water?
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water, to each other in the double helix
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Nucleotides
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are phosphate esters of nucleosides with 1, 2, or 3 phosphate groups joined to the ribose ring by 5' hydroxy group
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Backbone and variable portion of protein?
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backbone- peptide bonds with a carbon between them
variable portion- R group attached to alpha carbon |
