Science & Mathematics - 31 October 2007

The Mars Pathfinder is designed to drop the vehicle's instrument package from a height of 20 meters above the Martian surface, after the speed of the probe has been brought to zero by a combination parachute-rocket system at that height. To cushion the landing, giant air bags surround the package. The mass of mars is 0.1074 times that of earth and the radius of mars is 0.5282 that of earth. FInd a) the accerleration due to gravity at the surface of Mars, b) and how long it takes for the instrument package to fall the last 20 meters.

help please!

2007-10-31 11:36:29 · 2 answers · asked by sccrsweetie 2 in Physics

Would not it be cool to have multiplicative money.
You pay 4 ten dollar bills and buy a car for
10x10x10x10 = $10,000

2007-10-31 11:36:23 · 4 answers · asked by Alexander 6 in Mathematics

2007-10-31 11:36:00 · 6 answers · asked by irien 1 in Biology

Scandium
Titanium
Vanadium
Chromium
Manganese
Iron
Cobalt
Nickel
Copper
Zinc
These elements are transition metals in groups 3 to 12, so I dont know how much valence electrons they each have.

2007-10-31 11:35:07 · 1 answers · asked by Brandon 1 in Chemistry

2007-10-31 11:34:05 · 1 answers · asked by Anonymous in Mathematics

Unknown compound:
solubility: high
solution color: colorless
flame color: orange
acidity: neutral
conduct electricity?: yes

which compound is it from the following?
barium nitrate
calcium nitrate
potassium nitrate
sodium nitrate

2007-10-31 11:24:28 · 2 answers · asked by Tod T 2 in Chemistry

We learned in class today and I just cant understand it when Im on my own but he still collects it before showing us how to do it so I guess I just need to ask on here...

1)... he did this by lifting and holding above his head a barbell whose mass was 253 kg. His mass at the time was roughly 113kg. Draw a free-body diagram and the forces in the problem. *Calculate the normal force exerted on each of his feet during the time he was holding the barbell.*

2)A gorillas mass is about 3.10x10^2 kg. Suppose it hangs from two vines, each of which makes an angle of 30 with vertical. Draw the diagram with forces and *find the magnitude of the force of tension in each vine. What would happen to the tensions if the upper ends of the vines were farther apart?*

2007-10-31 11:23:14 · 1 answers · asked by shepey11 2 in Physics

HELP!!!!!

2007-10-31 11:22:42 · 6 answers · asked by Anonymous in Mathematics

Betty weighs 436N and she is sitting on a playground swing seat that hangs 0.46 m above the ground. Tom pulls the swing back and releases it when the seat is 1 m above the ground. the acceleration of gravity is 9.8 m/s/s.

how fast is Betty moving when the swing passes through its lowest position? answer in units of m/s.

if Betty moves through the lowest point at 1.4 m/s, what is the magnitude of the work done on the swing by friction? answer in units of J

2007-10-31 11:22:00 · 1 answers · asked by lilprincess_2good4u 1 in Physics

2007-10-31 11:20:04 · 18 answers · asked by Deenie 6 in Paranormal Phenomena

a bead slides without friction around a loop-the-loop. the bead is released from a height of 24.7 m fromt he bottom of the loop-the-loop which has a radius 9m. the acceleration of gravity is 9.8m/s/s.

what is its speed at the top of the loop-the-loop? answer in units of m/s.

2007-10-31 11:17:02 · 2 answers · asked by lilprincess_2good4u 1 in Physics

Is the alcohol that we drink lipophilic? Namely, does alcohol we consume enter the brain through the blood-brain-barrier because it is lipophilic? Or, does it require a co-transporter of some sort in order to enter the brain and administer its effects?

2007-10-31 11:16:45 · 2 answers · asked by experimental9582 1 in Biology

Hi, I'm just wondering if chlorophyll b is an accessory pigment and does not transfer the energy of light to the carbon fixation reactions of photosynthesis, what is its functions?

And I know it's different from carotenoids which protect the plants from high energy radiation.

Thx for the help.

2007-10-31 11:14:41 · 3 answers · asked by Anonymous in Botany

how those that organelle work on a analogy as a restaurant.
help please

2007-10-31 11:06:09 · 2 answers · asked by Domingo/Janet 1 in Biology

A car traveling on a flat (unbanked) circular track accelerates uniformly from rest with a tangential acceleration of 2.10 m/s^2. The car makes it .25 of the way around the circle before it skids off the track. What is the coefficient of static friction between the car and track?

The tires of a 1475 kg car are 0.591 m in diameter and the coefficients of friction with the road surface are µs = 0.8 and µk = 0.6. Assuming that the weight is evenly distributed on the four wheels, whats the maximum torque that can be exerted by the engine on driving wheel such that the wheel does not spin. Suppose that the car is at rest.

A bus is designed to draw its power from a rotating flywheel that is brought up to its maximum rate of rotation (3060 rev/min) by an electric motor. The flywheel is a solid cylinder with a mass of 1100 kg and diameter 1.03 m. If the bus requires an average power of 9.1 kW, how long does the flywheel rotate?

2007-10-31 11:04:36 · 2 answers · asked by niceguy0789 2 in Physics

If both genders are equally likely at birth, what is the probability that exactly 4 of the 6 children will be girls?

2007-10-31 11:04:20 · 2 answers · asked by Anonymous in Mathematics

HELP ME PLEASE!

2007-10-31 11:02:19 · 3 answers · asked by Anonymous in Biology

can you help me find the points on the ellipsoid x^2 + 2y^2 + 3z^2 = 1 where the tangent plane is parallel to the plane 3x - y + 3z = 1?

2007-10-31 11:01:46 · 2 answers · asked by Anonymous in Mathematics

Please Help Automatic 10 pts!!

2007-10-31 11:01:05 · 9 answers · asked by Anonymous in Astronomy & Space

x(squared)-6=0

thank you.

2007-10-31 10:59:40 · 6 answers · asked by a_aramirez 1 in Mathematics

2007-10-31 10:58:27 · 5 answers · asked by Anonymous in Weather

I'd heard (whether true or not) that fluorescent lighting, with it's intermitent flickering, causes your eyes to involuntarily adjust to the fluctuations of this light; thereby causing the eyes to work harder; thereby causing fatigue. Any truth?

2007-10-31 10:53:21 · 5 answers · asked by bgsimsrvp 1 in Other - Science

Ever think about that? I just saw a guy do a "trick" on Ellen's Show that looked really really impossible to be a trick. (Yes, I know it was a trick)
How would you feel if it really was magic?? Would you be glad or scared??

2007-10-31 10:51:53 · 3 answers · asked by Deenie 6 in Paranormal Phenomena

The value of a car after t years is a depreciation can be found by the formula V=m(1-r)^t. If the intitial value, m=$32.620, and the depreciation , r=17%, how long will it take for the value of the car to be less than $9240.

2007-10-31 10:51:34 · 3 answers · asked by Azumi 2 in Mathematics

2007-10-31 10:50:41 · 3 answers · asked by tsugamoto 2 in Weather

How does it affect our lives

2007-10-31 10:50:17 · 4 answers · asked by Anonymous in Physics

2007-10-31 10:49:01 · 4 answers · asked by Keg D 1 in Zoology

find the y intercept for both of these problems

2007-10-31 10:48:02 · 7 answers · asked by abqskater 1 in Mathematics

Give me an example of 2 numbers that are not integers and tell me why dey are not integers.... Happy Halloween.

2007-10-31 10:47:50 · 3 answers · asked by Hello (: 3 in Mathematics

to adopt a chimpanzee? i know that you can do it like where you just get a photo and stuff like that, but i mean actually adopt one. thank you!!!!

2007-10-31 10:46:35 · 2 answers · asked by ♥ G 3 in Zoology