Science & Mathematics - 20 November 2007

could u tell me how i can round these numbers to the nearest 25cents?

$43.89

$28.46

$7.33

$149.60

tnx

2007-11-20 11:16:44 · 8 answers · asked by RoxyGurl98 1 in Mathematics

my boyfriend and I are debating it

2007-11-20 11:10:55 · 2 answers · asked by Stephanie R 5 in Weather

52 playing cards. They give me 3 cards. What is the probability for me to obtain the 6 and the 7 of hearts? The other card I obtain doesn't matter, it can be whatever card. I've thought of the problem, but couldn't solve it. Please explain your calculous... and thank you SO much! Is it 2/52+2/52+2/52? I guess no, but close.

2007-11-20 11:07:40 · 3 answers · asked by Anonymous in Mathematics

2007-11-20 11:05:47 · 4 answers · asked by Anonymous in Astronomy & Space

2007-11-20 11:05:44 · 8 answers · asked by ccipriano91 2 in Weather

in your chair at work

2007-11-20 11:03:52 · 14 answers · asked by Anonymous in Astronomy & Space

abcd is a square
a) find the distance from H to each side of the square.
b) find BF, FC, CG, DE, EA, EH and HF.

could somebody help? u dotn needa find all of them for me juts a few w work so i have an understanding of how to find it . ty ;]



[IMG]http://i228.photobucket.com/albums/ee97/krakhead546/lala.jpg[/IMG]

http://i228.photobucket.com/albums/ee97/krakhead546/lala.jpg

http://s228.photobucket.com/albums/ee97/krakhead546/?action=view¤t=lala.jpg


one of these links will show you the picture of the square thansk all

2007-11-20 11:03:51 · 3 answers · asked by Anonymous in Mathematics

If I get a - under the radical what do I do?
x = 3 +/- sqrt -11 over 2
what do I do with the -11 under the radical?

2007-11-20 10:58:42 · 2 answers · asked by net_phantom16 2 in Mathematics

2007-11-20 10:58:29 · 20 answers · asked by NYGIRL 2 in Zoology

2007-11-20 10:58:19 · 3 answers · asked by smilez 2 in Earth Sciences & Geology

Hopping into your Porsche, you floor it and accelerate at 9.1 m/s^2 without spinning the tires. Determine the minimum coefficient of static friction between the tires and the road needed to make this possible.

Please show/explain all work clearly please.

2007-11-20 10:57:44 · 1 answers · asked by Anonymous in Physics

I know it is sci-fi but on armageddon too, things blow up in space. - I thought one needs oxygen for combustion?

2007-11-20 10:56:48 · 12 answers · asked by Anonymous in Astronomy & Space

If they all have the same DNA, how do they figure out what to become

2007-11-20 10:55:39 · 2 answers · asked by Jason 2 in Biology

A box is pulled at an angle of 37 degrees above the horizontal with a force of 50 N. The mass of the box is 40 kg and the coefficient of kinetic friction is 0.4. Calculate the quantities for the blanks below.

weight ________
F(subscript x) __________
Normal force (W-Fsubscript y) _________
F (force of friction) __________
F(subscript net) ____________
Acceleration __________

Please show/explain all work clearly please.

2007-11-20 10:55:21 · 1 answers · asked by nirmal 1 in Physics

Last week, for the first time ever, I noticed that the moon, while in a crescent stage , was very, very royal blue on the inside of the crescent. I found it very odd and watched it off and on foe over three hours as it moved across the sky. It did not change. Has anyone else ever seen this?

2007-11-20 10:55:06 · 7 answers · asked by yoohoo64 2 in Astronomy & Space

I can't find where to subscribe . I heard you can

2007-11-20 10:51:37 · 6 answers · asked by Planet22 2 in Astronomy & Space

im algebra today we were joking around and my teacher said no one has died from doing math but later said that someone had exculy died from doing math and that who ever could tell her first would get extra credit that I need. I know most people dont just say what they want in a best answer but I like telling people. What im looking for is not only an answer but also the most sorces that says so.

2007-11-20 10:45:49 · 6 answers · asked by Anonymous in Mathematics

I know it is compressed gas but where do people find it?

2007-11-20 10:42:30 · 4 answers · asked by Anonymous in Other - Science

how do you broadcast your own radio station? how would you go about this using short wave/long wave radios

2007-11-20 10:34:53 · 6 answers · asked by i am me 1 in Engineering

2007-11-20 10:34:42 · 11 answers · asked by Anonymous in Astronomy & Space

the legs black and brown stripes. body looks like a tranchlas body inverted like and camoe. body brown, black and tan. and is about2.5 to 3 inches round.

2007-11-20 10:33:28 · 3 answers · asked by anthony k 1 in Zoology

The question asks "The X-intercepts of a porabola are 5 and -7. What is the equation of the axis of symmetry? Explain."

I already know the answer is 12 by using simple + and - but is there a way to do it algebraically?

Thanks

2007-11-20 10:31:52 · 3 answers · asked by Anonymous in Mathematics

40 pieces are blue
35 are red
30 are green
50 are yellow
45 are white

If two pieces of bubble gum are purchased, what is theprobability that both will be yellow? Show all work and explain it in detail best answer 10 points!! thanks

2007-11-20 10:27:59 · 5 answers · asked by hockeyman25158 2 in Mathematics

Pb3(PO4)2
PbSO4
Pb(SO4)2
Cu(NO3)2
BaCO3
KNO3
Zr(NO3)2
NH4NO3

Manganese(VI)Phosphate
Manganese(IV)Sulfate
nickel(II)Carbonate
Nickel(III)Carbonate
Copper(I)Phosphate

Please help....I am struggling in Chemistry

2007-11-20 10:25:59 · 3 answers · asked by Anonymous in Chemistry

What happens to the atoms of the reactants in a chemical reaction?

2007-11-20 10:25:50 · 3 answers · asked by Zayka 1 in Chemistry

1: The vertical and horizontal motions of a projectile are:
The same
Inversely proportional to one another
Directly proportional to one another
Independent of one another


2: The range of a projectile depends upon the acceleration due to gravity and upon both components of the initial:
Force
Position
Velocity
Acceleration


3: The angle that results in the maximum range of a projectile is:
180 deg.
30 deg.
45 deg.
60 deg


4: An arrow is shot at 30.0 degrees above the horizontal. Its initial velocity is 49 m/s and it hits the target. What is the maximum height the arrow will attain?
49 m
25 m
75 m
30 m


5: In question # 4, if the target is at the same height from which the arrow was shot, how far away is the target?
1.1 x 104m
2.1 x 104m
1.1 x 102m
2.1 x 102m


6: A dart player throws a dart horizontally at a speed of 12.4 m/s. The dart hits the board 0.32m below the height from which it was thrown. How much time does it take for the dart to hit the board?
2.6 s
3.2 s
4.5 s
0.8 s


7: A basketball player tries to make a half court jump shot, releasing the ball at the height of the basket. Assuming that the ball is launched at 51 degrees, 14.0m from the basket, what speed must the player give the ball?
140 m/s
9.4 m/s
11.8 m/s
13.3 m/s


8: The range of a projectile launched at an angle is the same for which two angles?
15 degrees and 75 degrees
45 degrees and 30 degrees
45 degrees and 60 degrees
Answers b and c only


9: A ball is thrown at an angle of 66.0 degrees above the horizontal with an initial velocity of 4.47 m/s. What is the maximum height the ball attains?
1.532 m
1.698 m
0.849 m
2.55 m


10: In question # 9, what is the range of the ball thrown. (hint: use x = R; so x = vx0t)
1.51 m
3.02 m
1.36 m
1.70 m


11: In which of the following examples is a net force of zero acting on the object in question? I. A car drives around a circular racetrack at a constant speed. II. A person pushes on a door to hold it shut. III. A ball, rolling across a grassy field, comes to a stop.
I only
II only
III only
I and II


12: In figure 1 above a block is suspended from two ropes, so that it hangs motionless in the air. If the magnitude of T2 is 10.0 N, what is the magnitude of T1?
.500 N
0.866 N
10.0 N
17.3 N


13: A 50 kg crate rests on the floor. The coefficient of static friction is 0.5. The force parallel to the floor needed to move the crates is most nearly:
50 N
125 N
250 N
500 N


14: A person is pushing an object of mass m along the ground with a force F. The coefficient of kinetic friction between the object and the ground is (mu)k. The object is accelerating, but then the person stops pushing and the object slides to a halt. The person then starts pushing again with a force F, but the object doesn't budge. The maximum coefficient of static friction between the object and ground is ms. Which of the following statements is true?
F>(mu)k/(mu)s
(mu)kmgsmg
(mu)smg=F
The scenario described is physically impossible.


15: A 1 kg mass on a frictionless inclined plane is connected by a pulley to a hanging 5.0 kg mass, as in figure 2 above. At what angle will the system be in equilibrium? (in degrees)
-45
-30
30
45


16: A man of mass 80 kg sits in a chair. What it the magnitude of the normal force exerted on the man by the chair?
70.2 N
80 N
89.8 N
784 N


17: A force F acts on object A of mass m1. An identical force acts on object B of mass m2. A experiences acceleration a1 and B experiences acceleration a2. If a2 = 2a1, what is m2 in terms of m1?
1/2 m1
m1
2m1
4m1


18: Which is a vector quantity?
distance
speed
power
force


19: A granite block is being slid at a constant speed across a horizontal concrete floor by a force parallel to the floor. Which pair of quantities could be used to determine the coefficient of friction for the granite on the concrete?
mass and speed of the block
mass and normal force on the block
frictional force and speed of the block
frictional force and normal force on the block


20: After a model rocket reached its maximum height, it then took 5.0 seconds to return to the launch site. Neglecting air resistancce, what is the approximate maximum height reached by the rocket?
49m
98m
120m
250m


21: What term describes how well the results of an experiment agree with the standard value?
Accuracy
Precision
Uncertainty
Reproducibility


22: Which of the following is the largest number?
1.23 E+4
1.23 x 10^4
12300
all of the above


23: The measurement 0.001234 g has how many significant digits?
4
2
3
1


24: According to graphing convention, the values of the dependent variable are plotted
vertically (on the x-axis).
vertically (on the y-axis).
horizontally (on the x-axis).
horizontally (on the y-axis).


25: Which of the following, is a place where you mightfind a physicist working?
high schools
hospitals
Wall Street
all of the above

2007-11-20 10:24:40 · 4 answers · asked by Anonymous in Physics

2007-11-20 10:24:04 · 15 answers · asked by julie q 1 in Mathematics

what is x=?

2007-11-20 10:22:05 · 14 answers · asked by julie q 1 in Mathematics

sqrt = squareroot
^2 = to the 2nd power.
Ok heres the problem:

x^2 - 10x + 21 = 0
a=1 b= -10 c= 21 Right?

x= -b +/- sqrt b^2 - 4(a)(c) over 2(a)
Thats the formula

Now does b go in the formula as -10? or 10 because the formula says -b not b so would that make it 10?

2007-11-20 10:21:51 · 4 answers · asked by net_phantom16 2 in Mathematics

Please give the answer to four decimal places.

2007-11-20 10:19:56 · 1 answers · asked by dave h 1 in Mathematics