Science & Mathematics - 23 July 2007

Moreover on the wings and fuselage of the craft. Need very strong,durable,and also temperature resistance to any radical changes that may occur and effect any structural strength of the wings.(Hot or cold ). Also it shall b constructed for glider use at high alt. May install system for any emg.bail out or eng. failures that may occur. Nd any imput as to what internet address I can contact 4 any further info.

2007-07-23 13:38:28 · 2 answers · asked by Anonymous in Engineering

2007-07-23 13:37:49 · 3 answers · asked by icbobby 1 in Astronomy & Space

23j-33Y_=32jbaw111+{2R*02-H2o carbon} hgh mph 112P
air pressure 65J- y=ma -22.23. how fast does the car have to be going if it was turned in to gas. but no interfernce of joules and r=99+232Pressure./time which is not solved . convert 20 m to kilo and then convert to (K)-(u)
V=d/t v=YF

2007-07-23 13:37:31 · 4 answers · asked by hey2cesar 1 in Mathematics

in the skin than if melanin levels were lower.
i dont know whether this would be vitamin D or folic acid?

2007-07-23 13:37:29 · 1 answers · asked by biomes 1 in Biology

Time is something we usually can rely on. Every once in awhile, time seems to go haywire, gets fouled up in a glitch, moves impossibly fast or impossibly slow. Is it time itself that gets screwed up or is it just our prception of it? Its a fact time is not moving at a steady pace without interruptions. Could it have something to do with the expansion of the universe? I believe time is a companion that accompanies us on our journeys through life. What do you think?

2007-07-23 13:35:56 · 13 answers · asked by ZORRO 3 in Paranormal Phenomena

2007-07-23 13:34:46 · 8 answers · asked by Anonymous in Zoology

The fact that Hb^S allele has remained in African populations even though it is detrimental in the homozygous state is a result of? I cant decide b/t a homozygous or heterozygote advantage, but my best guess is heterozygote advantage.

2007-07-23 13:30:51 · 2 answers · asked by swt16 1 in Biology

I would say a homozygote and a heterozygote for one trait, right?

2007-07-23 13:27:43 · 2 answers · asked by swt16 1 in Biology

Joan originally had twice as many books as Emily. After she gave Emily 5 books, Joan still had 10 more than Emily. How many books did Joan have originally?

2007-07-23 13:27:05 · 7 answers · asked by wu_4533 2 in Mathematics

2007-07-23 13:26:20 · 2 answers · asked by Davidson 1 in Botany

A. Sedimentary formations may be in contact with other sedimentary formations, but not with igneous rocks. TRUE?

B. Two half-lives equals a whole life in radioactive decay. TRUE?

C. A given rock may contain more than one type of radioactive element, permitting independent age estimates to be obtained. TRUE?

D. A formation containing a particular set of index fossils is assumed by geologists to be the same age as any other formation containing the same set of index fossils. FALSE?

E. The rate of radioactive decay of a given element varies with changes in Earth's gravity and magnetic fields. TRUE?

-THANKS

2007-07-23 13:26:11 · 3 answers · asked by noname 3 in Earth Sciences & Geology

2007-07-23 13:23:58 · 5 answers · asked by Judy 1 in Zoology

Will earth look like saturn in years to come, but with rings in all directions, from all the space trash floating around are planet.
how much of a problem is it...

2007-07-23 13:16:18 · 7 answers · asked by g_playa_gent 1 in Astronomy & Space

Im havn trouble with this its for my Stats class...

Suppose that 3 cards are drawn from a deck of cards, each card was replaced and the deck reshuffled. What is the probability of getting one of more hearts?

2007-07-23 13:15:01 · 4 answers · asked by RubiaBonita 2 in Mathematics

express this statement in a diffrent way
1/2=5/10

express 2:5=4:10 as a fraction

solve x in the following problem
3/5=x/25
4:10=x:40

in this problem if y is larger tahn 8 what statement can made about the size of x
y/4=x/3

2007-07-23 13:13:47 · 3 answers · asked by deebeals 1 in Mathematics

1. How should the selector switch be set when checking a resistive element coil for continuity?

A. To the AC volts position
B. To the lowest DC volts range, then to a higher range until an accurate reading is obtained

C. To the OHMS position

D. To the DC amps position




2. When an AC voltage is being measured across a 15 W resistor which is carrying a current of 12 amps, the selector switch should be set to the AC voltage position of

A. 2 volts.
B. 200 volts.

C. 20 volts.

D. 1000 volts.




3. If the function/range switch is set at 200 VAC, what will the multimeter read if a measurement is made directly across both terminals of a good fuse or circuit breaker in a 120 VAC line?

A. 0 VAC
B. 120 VAC

C. 200 VAC

D. 120 VDC




4. If the function/range switch is set at 200 VAC, what will the multimeter read if a measurement is made directly across both terminals of a blown fuse or tripped circuit breaker in a 120 VAC line?

A. 0 VAC
B. 120 VAC

C. 200 VAC

D. 120 VDC




5. Determine the current in a circuit consisting of a 1000 ohm resistor with a voltage of 50 volts DC across it.

A. 50 A
B. 20 A

C. 20 mA

D. 50 mA




6. When measuring an unknown DC voltage with your multimeter, you should first

A. set your selector switch to the lowest DC range and then move to a higher range until you can get an accurate reading.
B. set your selector switch to the highest DC voltage range and then decrease to the range that will give you the most accurate reading.

C. ground the meter.

D. ground the circuit.




7. The multimeter for this manual can measure resistances up to about

A. 2 kilohms.
B. 200 kilohms.

C. 20 kilohms.

D. 2 megohms.




8. The main reason why you should avoid bodily contact with ground while working on live electrical equipment is that such contact will

A. impair the accuracy of the measurement.
B. cause a fuse to blow.

C. damage the measuring instrument.

D. result in an electric shock.




9. Calculate the resistance of a circuit that draws 10 amps at a voltage of 120 volts.

A. 1.2 W
B. 12 W

C. 120 W

D. 1200 W




10. Calculate the power (P) in watts dissipated by a resistor of 1000 ohms with 200 volts across it.

A. .2 watts
B. 20 watts

C. 40 watts

D. 400 watts




11. To measure an unknown line voltage at an electrical outlet,

A. set the function/range switch to 1000 volts DC/V and insert the test leads in the outlet. Observe the polarity.
B. set the function/range switch to the highest ohm range and insert the test leads in the outlet.

C. set the function/range switch to 10A-DC and place the red test lead in the 10 amp jack. Insert the test leads in the outlet.

D. set the function/range switch to 750 volts ACV and insert the test leads in the outlet.




12. Assume that the function/range switch is on the 20 kW position and the multimeter displays "1" when the test leads are across an unknown resistor. What would most likely cause the meter to display "1" ?

A. A weak battery
B. The function/range switch not set on a high enough scale

C. A faulty ON/OFF switch

D. Shorted test leads




13. When measuring current, always place the meter in

A. series with the circuit.
B. the highest AC volts position.

C. the highest DC volts position.

D. parallel with the circuit.




14. Assume a device draws 50 mA of current and 150 VDC across it. What is its resistance?

A. .3 kW
B. 3000 W

C. 7.5 kW

D. 7.5 W




15. What precaution should be observed when the multimeter isn't being used?

A. The selector switch should be placed in the ohms postion.
B. The test leads should be shorted together.

C. The selector switch should be in the hFE postion.

D. The selector switch should be in the OFF position.




16. When working with electricity, the electrician should make a practice of

A. regarding electricity with fear.
B. assuming that the circuit is OFF.

C. working with the left hand in a pocket.

D. working on live equipment only.




17. When is the Common jack on the front panel used?

A. For current measurements only
B. For all functions using test leads

C. For resistance measurements only

D. For line voltage measurements only




18. If an appliance draws 10 amps and the line voltage is 110 volts, the power consumed is

A. 110 watts.
B. 1.1 kW.

C. 11 kW.

D. 1100 kW.




19. A circuit whose resistance is 22 W and has an applied voltage of 440 volts will draw a current of

A. 2 amps.
B. 20 amps.

C. 200 amps.

D. 2000 amps.




20. If an appliance is plugged in but the switch is OFF, the electrician should always consider the appliance as

A. hazardous.
B. ungrounded.

C. safe.

D. de-energized.

2007-07-23 13:12:04 · 3 answers · asked by Nother one 1 in Engineering

2007-07-23 13:11:53 · 2 answers · asked by Danielle 1 in Biology

My kids found the body of a barn owl in the desert behind our house. It's head and a wing had been ripped off the body, but the parts were intact (whole). What would/could do this to an owl?

2007-07-23 13:10:41 · 3 answers · asked by CHEYNA M 2 in Biology

where is the best place to find this information?

2007-07-23 13:10:30 · 2 answers · asked by Anonymous in Geography

2007-07-23 13:02:22 · 3 answers · asked by Curtis W. R 2 in Engineering

1 Two student, Lee and Melanie, each hold a solid object. Lee has solid object A and Melanie has solid object B. The students make the following observations:

Larry: "My object has three times the mass of object B and since density is directly proportional to mass, my object has 3 times the density of object B."

Melanie: "My object takes up 1/3 of the volume of object A, and since density is inversely proportional to mass, my object is 3 times as dense as object A."

a) which student, if either, is correct?

b) If the statements about the mass and the volumes of each object are correct, how do the densities of each object compare?

2007-07-23 12:59:18 · 4 answers · asked by sunshinegirl93534 2 in Physics

2007-07-23 12:58:46 · 2 answers · asked by linifer74 1 in Chemistry

If there are 8 furlongs in a mile, how many miles are there in 30 furlongs?

2007-07-23 12:57:49 · 5 answers · asked by Amber B 1 in Mathematics

So i wanna convert the kinetic energy of a spinning disc (like a motor) to a electrical energy (in electricity).... Please explain me it detailed. Thanks

2007-07-23 12:56:09 · 2 answers · asked by Anonymous in Physics

I live near Marshall, Minnesota and it got up to 99 degrees today.

2007-07-23 12:54:18 · 12 answers · asked by Dawn 2 in Weather

If you think about it, his mythical proportions are all outrageosly sized so why must we concentrate on the size of his feet? Are a community of foot fetishists?

2007-07-23 12:51:49 · 7 answers · asked by Anonymous in Zoology

it was really bright which was seems unusual because it was light out an the meteor was so bright, seemed like it was right in front of me, extremely bright with a blue ball like end....

2007-07-23 12:51:32 · 3 answers · asked by tobecontent 2 in Astronomy & Space

I know a lot depends on color, clarity etc... but what is the high/low rates for rare green fluorite?

2007-07-23 12:47:06 · 4 answers · asked by Anonymous in Earth Sciences & Geology

1. After 2/3 of the marbles are removed from a jar, 5 more than 1/6 of the marbles remain.




2. In a jar, there are 4 more than twice as many blue marbles as red marbles.




thats all, thanks to all who answered!!!

2007-07-23 12:45:31 · 8 answers · asked by Ann 3 in Mathematics

And do you believe each one can actually be used in aiding healings?
I'd like to hear some examples.

2007-07-23 12:41:31 · 15 answers · asked by deirdrefaith 4 in Other - Alternative