Alexander Mentes

I'm studying for a biology final right now and I have been having a hard time with the zooids of both of these phylums. My questions are

How are zooids and colonies organized? How do these animals feed? Is there zooid polymorphism and what kind? Do zooids coordinate/collaborate in certain structures and functions?

Also what are the major differences between both of these zooids. Are they anything like the sponge zooids?

Any help would be greatly appreciated.

The measure of the total concentration of dissolved solids in water is called what?

A. Alkalinity

B. Salinity

C. Turbidity

D. Hardness

I know it's not either of the first two. I am torn between C and D. Any help would be greatly appreciated.

You collected a stratified random sample of oyster density (per m2) in a creek off of Cedar Key. You strata were broken into sub-tidal to mean low tide (low), mean low tide to mean tidal (mid), and mean tidal to mean high tide (high). In the area you surveyed low=1000m2, mid=200m2, high=300m2. You use the following number of 1m2 quadrats in each area low=10, mid=20, high=15. You calculate mean density in each area to be low=12.3, mid=35.6, high= 16.7 with variances of low=36, mid=30, high= 24. What is the overall mean density of oysters. Report your answer to 1 decimal place.

I have to write a three page paper on a device or piece of technology that relates to Laws of Relativity or Quantum Mechanics. I am having a difficult time really coming up with a device that would make a great topic. Does anybody have any good ideas and if so how does it relate to Quantum Mechanics or the Laws of Relativity.

A starship moving toward Earth with a speed of 0.70 c launches a shuttle craft in the forward direction. The shuttle, which has a proper length of 12.8m , is only 6.28m long as viewed from Earth.

Q) What is the speed of the shuttle relative to the starship?

Any help would be greatly appreciated. I honestly have no clue how to do this one. Please help! :(

So I have to write a Physics paper on this topic:

Pick a device and describe how it works using the laws of electricity and magnetism.

I have an idea in mind but I would like to see if anybody has any ideas on what I can write this paper about and how the device actually uses Physics?

A convex lens with f1= 20.2cm is mounted 39.2cm to the left of a concave lens. When an object is placed 30.1cm to the left of the convex lens, a real image is formed 59.9cm to the right of the concave lens.

Q) What is the focal length f2 of the concave lens?

Q) White light is incident on a soap film (n = 1.33, thickness = 807.0nm ) suspended in air.

A) If the incident light makes a 45∘ angle with the normal to the film, what visible wavelength(s) will be constructively reflected?

How do you solve this one??

My lab is asking me to write the balanced equation showing acidity or basicity for the following.

0.010 M HCL

0.010 M CH3COOH

0.010 M NaOH

0.010 M NH3

I'm not quite sure what they mean by this. Any help would be greatly appreciated.

When the potential difference between the plates of a capacitor is increased by 3.30V , the magnitude of the charge on each plate increases by 12.0μC .

What is the capacitance of this capacitor?

Q) The electric potential a distance r from a point charge q is 170V , and the magnitude of the electric field is 2100N/C .

A) Find the value of r.

B) Find the value of q.

For safety reasons, electrical codes have been established that limit the amount of current a wire of a given size can carry. For example, an 18-gauge (cross-sectional area = 1.17 mm2 ), rubber-insulated extension cord with copper wires can carry a maximum current of 5.0 A.

Q) Find the voltage drop in a 12−ft , 18-gauge extension cord carrying a current of 5.0 A. (Note: In an extension cord, the current must flow through two lengths-down and back.)

How on earth do you solve this??

A portable CD player uses a current of 7.5 mA at a potential difference of 3.5 V.

A) How much energy does the player use in 30s ?

B) Suppose the player has a mass of 0.65kg . For what length of time could the player operate on the energy required to lift it through a height of 1.2m ?

Any help would be greatly appreciated.

When a nerve impulse propagates along a nerve cell, the electric field within the cell membrane changes from 7.2×105N/C in one direction to 3.2×105N/C in the other direction.

Approximating the cell membrane as a parallel-plate capacitor, find the magnitude of the change in charge density on the walls on the cell membrane.

Express your answer using two significant figures.

A container holds a gas consisting of 5.75 moles of oxygen molecules. One in a million of these molecules has lost a single electron.

Q=

What is the resistance of 6.1mi of copper wire with a diameter of 0.57mm ?

Express your answer using two significant figures.

R = kΩ

What is the resistance of 5.9mi of copper wire with a diameter of 0.57mm ?

Powering a Pigeon A pigeon in flight experiences a force of air resistance given approximately by F=bv2, where v is the flight speed and b is a constant.

1) What are the units of the constant b?

2) What is the largest possible speed of the pigeon if its maximum power output is P?

3) By what factor does the largest possible speed increase if the maximum power is doubled?