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Terms in this set (25)
Acid
Compound that produces hydrogenated ions in water lower ph to below 7
Base
Compound that produces hydroxide ions in the water raises the ph above 7
Cell
Smallest and most basic unit of structure and function in an organism
convection current
Transfer of thermal energy in a fluid (gas or liquid), in which warmer fluid.
dependent variable
In an experiment it is the factor that is measured or responds; data collected on this variable.
epicenter
Point on Earth's surface directly above an earthquake's focus.
fault
Fracture within the Earth's rocky crust, where the rocks slide past each other.
force
Any push or pull, of any size.
independent variable
A factor in an experiment that is being tested, manipulated (I decide to test).
lava
Molten rock flowing onto Earth's surface.
lever
Simple machine in which a bar that pivots on a fixed point.
magma
Hot melted rock material beneath Earth's surface.
meniscus
Curved surface of a liquid, such as water, where it meets the sides of its container.
Newton
SI unit of force. Symbol: N
nucleus
Organelle in a cell that is the control center and contains the cell's DNA
organelle
Structures in the cell's cytoplasm that carry out cell activities.
qualitative data
Data that deals with descriptions; qualities observed with the senses.
quanitative data
Data is measured with numbers such as mass, area, time.
sciendtific law
Statement about how things work in nature that is true consistently.
scienctific theory
Explanation of things or events based on scientific knowledge resulting from observations and experiments.
temperature
Measure of average heat energy.
trade-off
A risk you accept to gain a benefit.
variable
A factor that can change in an experiment.
viscosity
A liquids resistance to flow.
wedge
Simple machine that resembles a moving inclined plane that will split, divide or lift a load.
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Verified questions
engineering
Describe the intersection of the following surfaces: (a) x = 2, y = 5 (b) x = 2, y = - 1, z = 10 (c) r = 10, $\theta=30^{\circ}$ (d) $\rho=5, \quad \phi=40^{\circ}$ (e) $\phi=60^{\circ}$, z = 10 (f) r = 5, $\phi=90^{\circ}$
engineering
Consider the airplane described in previous problem and suppose that the engine under the wing to the pilot's right loses thrust. (a) If you represent the two remaining thrust forces by a force $\mathbf{F}$ acting at the origin $O$ and a couple $\mathbf{M}$, what are $\mathbf{F}$ and $\mathbf{M}$ ? (b) If you represent the two remaining thrust forces by the force $\mathbf{F}$ alone, where does its line of action intersect the $x-y$ plane?
chemistry
Zirconium is one of the few metals that retains its structural integrity upon exposure to radiation. For this reason, the fuel rods in most nuclear reactors are made of zirconium. Answer the following questions about the redox properties of zirconium based on the half-reaction $\mathrm { ZrO } _ { 2 } \cdot \mathrm { H } _ { 2 } \mathrm { O } + \mathrm { H } _ { 2 } \mathrm { O } + 4 \mathrm { e } ^ { - } \longrightarrow \mathrm { Zr } + 4 \mathrm { OH } ^ { - } \quad \mathscr { G } ^ { \circ } = - 2.36\ \mathrm { V }$ Is zirconium metal capable of reducing water to form hydrogen gas at standard conditions?
physics
An object moves so that its position changes in the following way: $x(t)=-100 \mathrm{m}+(30 \mathrm{m} / \mathrm{s}) t+\left(3.0 \mathrm{m} / \mathrm{s}^{2}\right) t^{2}$.(a) What kind of motion is this (constant velocity, constant acceleration, or changing acceleration)? (b) Describe all of the known quantities for this motion. (c) Invent a story for the motion. (d) Draw a velocity-versus-time graph, and use it to determine when the object stops. (e) Use equations to determine when and where it stops. Did you get the same answer using graphs and equations?
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