Science & Mathematics - 26 November 2007

A ball player hits a home run and the baseball just clears a wall 8.00 meters high located at 106.2 meters from home plate. The ball is hit at an angle of 36.1 degrees to the horizontal, and air resistance is negligible. Assume the ball is hit at a height of 1.1 meters about the ground. The acceleration of gravity is 9.81m/s/s
1. What is the initial speed of the ball? (m/s)
2. How much time does it take for the ball to reach the wall? (seconds)
3. Find the speed of the ball when it reaches the wall. (m/s)

2007-11-26 13:16:55 · 1 answers · asked by Anonymous in Physics

1. Which law was originally stated in terms of momentum?
2. Which law governs when to skaters push apart in a rink?
3. Which law governs the max. efficiency of a refrigerator?

2007-11-26 13:13:45 · 8 answers · asked by Anonymous in Physics

can you please help me please =D

2007-11-26 13:13:00 · 3 answers · asked by Anonymous in Astronomy & Space

2007-11-26 13:11:24 · 2 answers · asked by clowie2 1 in Medicine

A detective is called to the scene of a crime where a dead body has just been found. She arrives on the scene at 5:00pm and begins her investigation. Immediately, the temperature of the body is taken and is found to be 26.5 C. The detective checks the programmable thermostat and finds that the room has been kept at a constant 18C for the past 3 days.
After evidence from the crime scene is collected, the temperature of the body is taken once more and found to be 24 C. This last temperature reading was taken exactly ONE hour after the first one. The next day the detective is asked by another investigator, “What time did our victim die?” Assuming that the victim’s body temperature was normal (37 C) prior to death, what is her answer to this question? Newton's Law of Cooling can be used to determine a victim's time of death.

How would I solve for the variables to the equation f(x)=ab^x+c using the above information??

2007-11-26 13:11:15 · 1 answers · asked by Anonymous in Mathematics

A heat engine absorbs 1704 J from a hot reservoir and expels 1196 J to a cold reservoir in each cycle.
(a) What is the engine's efficiency?
______%
(b) How much work is done in each cycle?
______J
(c) What is the power output of the engine if each cycle lasts for 0.299 s?
_____W

2007-11-26 13:06:24 · 2 answers · asked by Anonymous in Physics

what are the factors of the followinq numbers !? :

- 75

- 57

- 90

- 102

- 77

- 42

- 81

- 132

2007-11-26 13:05:35 · 12 answers · asked by katie ! (: 1 in Mathematics

2007-11-26 13:05:07 · 4 answers · asked by lope star 1 in Physics

2007-11-26 13:04:58 · 1 answers · asked by Anonymous in Chemistry

I am looking for a technical chemical sounding name for pure unadulterated drinking water.

2007-11-26 13:03:43 · 7 answers · asked by Roland B 1 in Chemistry

Metallic magnesium reacts w/ water to produce magnesium hydroxide and hydrogen gas; if you have 16.2 g of magnesium and 12.0 g of H2O, how many moles of the excess reactant are left?

2007-11-26 13:03:11 · 3 answers · asked by Caramel 2 in Chemistry

Let N denote the smallest positive integer that satisfies the two conditions:
(i) If N is divided by 11 then the remainder is 9
(ii) If N is divided by 7 then the remainder is 5

What are the sum of the digits of N?

And how the heck do you do it?

2007-11-26 13:02:07 · 2 answers · asked by Anonymous in Mathematics

I wanted to plant some seeds for a science experiment in my classroom, but there are no seeds to be found in the stores... Can I use beans (lima, pinto, etc) to plant? I'm doing the experiment where you plant a seed in a ziplock bag, and observe the changes as the seeds tranforms into a plant....
Please help!

2007-11-26 13:01:41 · 3 answers · asked by B 2 in Botany

How would the answer be different if you were asked to find the degrees and minutes for the noon sight at 3:26 am GMT and the noon sight at 3:26 pm GMT? is there a difference?

2007-11-26 13:00:33 · 2 answers · asked by Backoff 2 in Geography

2007-11-26 13:00:22 · 4 answers · asked by skooteric 1 in Physics

1. devise a measure of solute concentration that you would place on the label for the following case: you weigh out 2.56g of zinc iodide. you put the solid zinc iodide in a 500mL flask and fill the flask with water to the 500mL mark. you now have 500mL of a zinc iodide queous solution. on the label of the flask you write (there can be many different possibilities)

2007-11-26 12:59:22 · 1 answers · asked by Neha G 1 in Chemistry

Well, my teacher assigned us homework and I've been gone for 2 weeks sick + Thanksgiving break, and I really have no idea what I'm doing. My grade right now in there is terrible, and it's dragging my GPA down a ton. It's basically a chart:

Angles | 15 | 30 | 45 | 60 | 75 | 90 | 5 | 85 |
______
Velocity | 200 | 200 | 200 | 200 | 200 | 200 | 200 | 200 |
______

V ox
_______

V oy

_______

T hang

_______

X max

_______

Y max

_______


Normally I wouldn't ask for something like this here, but my teacher is going to slaughter me if I don't get this done. I'm completley stumped and have been sitting in front of a blank piece of paper for a half an hour.

If you can't solve them, could someone at least try and explain what this is to me?

2007-11-26 12:59:20 · 2 answers · asked by Anonymous in Physics

A 2.0 kg otter starts from the rest at the top of a muddy incline 85 cm long and slides down to the bottom in 0.50 seconds. What net external force acts on the otter along the inline?? How do find the answer??

PLEASE HELP!!!!! THANKS IN ADVANCE TO THOSE WHO DO!!!

2007-11-26 12:59:09 · 1 answers · asked by Anonymous in Physics

2007-11-26 12:55:34 · 5 answers · asked by Alfonso G 1 in Chemistry

2007-11-26 12:51:53 · 3 answers · asked by Khang 1 in Physics

Steel sliding across steel has a  of .41. 50 N of steel is pushed with a force of 22 N. What would happen to the piece of steel – stay still, move at a constant velocity, or accelerate?

2007-11-26 12:49:36 · 2 answers · asked by Anonymous in Physics

Can u please answer me this question.
Thanks

An earthquake occurred at 9:40 A.M. on Nov. 1 1755 at Lisbon, Portugal, and it started a tsunami ( Often called a tidal wave) . It produced waves that traveled more than 540 ft/sec ( 370mph) and reached a height of 60 ft. If the period of the waves was 30 min or 1800 sec, estimate the length L between the crests.

2007-11-26 12:49:36 · 2 answers · asked by * * 1 in Weather

2007-11-26 12:47:59 · 6 answers · asked by ♥ ☆♫ I LOVE SHOPPING ! ♫ ☆ ♥ 2 in Weather

A baseball (m = 145 g) traveling 30 m/s moves a fielder's glove backward 35 cm when the ball is caught. What was the average force exerted by the ball on the glove?
Magnitude
______N

2007-11-26 12:47:38 · 4 answers · asked by lcbby 1 in Physics

The earth's radius is 6400 km. A 25 kg mass is taken 201 km above the earth's surface. What is the weight of the object at this height? please show work...im really lost -_-

2007-11-26 12:45:31 · 1 answers · asked by cowluver 3 in Physics

1. Why do you think scientists have only recently discovered subatomic particles?
2. What might scientists learn by breaking apart an atomic nuclei?

2007-11-26 12:44:46 · 2 answers · asked by Anonymous in Physics

Two ropes pull on a ring. One exerts a 47 N force at 30.0°, the other a 47 N force at 60.0°
(a) What is the net force on the ring?
Magnitude
____ N
Direction
____ °
(b) What are the magnitude and direction of the force that would cause the ring to be in equilibrium?
____ N
____ °

2007-11-26 12:44:38 · 3 answers · asked by Anonymous in Physics

do you know what is nuclear power plants? can you please type in easy sentences, because my english is not quit good!!!!!! so please help me out!!!!!!

another question are...............
is nuclear power plats use oil for.........?
when there will be run out of oil?
pls pls

2007-11-26 12:44:29 · 2 answers · asked by a2yeasmin 1 in Physics

some people said it was the army, some said it was some smart guy, what do you guys have to say?

2007-11-26 12:44:25 · 6 answers · asked by Anonymous in Other - Science

which prefix indicates each of the following numbers of atoms in a molecular compound formula?
a. 3
b. 1
c. 2
d. 6
e. 5
f. 4

2007-11-26 12:42:28 · 2 answers · asked by Anonymous in Chemistry