Physics - March 2007

Another one that stumped me......please help

John was at the top of a ladder. He threw a ball straight up in the air with an initial speed of 10.0 m/s and the neighbours below heard it strike the ground 3.0 seconds later, how far above the ground was John when he threw the brush?

2007-03-07 10:06:46 · 8 answers · asked by Anonymous

2007-03-07 10:00:03 · 8 answers · asked by Anonymous

why an air plane stays in the air?

2007-03-07 09:56:40 · 8 answers · asked by beauty mirna 3

at standard atmosphere pressure, temp. 85 degrees F, and air inside of large balloon is heated to 150 degrees F . how much weight will this large balloon be able to life if it is a sphere w/ radius of 25 meters? show WORK i couldnt figure it out thank you

2007-03-07 09:53:35 · 2 answers · asked by blackbeltcc4 2

I am just curious and I want to Know! It is a striking difference than other categories. Any reasons? Too Busy? Seems stupid? No Insults Please!

2007-03-07 09:47:26 · 3 answers · asked by Dovey 7

The value of g at the Earth's surface is about 9.8 m/s2. What is the value of g at a distance of twice the Earth's radius?

2007-03-07 09:43:37 · 3 answers · asked by Dirck G 1

A cart of mass 380 grams is temporarily held stationary on an incline at 3.7 degrees to horizontal.
•A mass of 75.00001 grams is attached to the cart by a string over a pulley located at the bottom of the incline; the mass hangs freely from the string.
•When the cart is released, what will be its acceleration in the direction down the incline?
•Sketch and label a reasonable facsimile of a scaled diagram showing the forces acting on the cart.

2007-03-07 09:24:32 · 1 answers · asked by tanie 1

which of the situations can be explained b Bernoulli's principle??
if Bernoulli's principle can explain the situation, write B before number. I fnot, write N.

1. a flat tire
2. the flight of a glider
3.flying a kite
4.floating in salt water
5.drinking through a straw
6.smoke rising in a chimney
7.roof pushed off from inside during high winds
8.pitching a curveball
9.floating a hot-air baloon
10.stopping a care with hydraulic brakes.

2007-03-07 09:14:35 · 1 answers · asked by Anonymous

If a trapeze artist rotates once each second while sailing through the air, and contracts to reduce her rotational inertia to one fifth of what it was, how many rotations per second will result?

2007-03-07 09:12:18 · 2 answers · asked by Dirck G 1

what is teh volume of one kg of air in standard atmospheric pressure and at 20 degrees Celsius? what formula do you use i cant think of anything
i used Pv=nrt but cant get it to work
please show work
i am realy stumped and need help

2007-03-07 09:08:13 · 3 answers · asked by blackbeltcc4 2

2007-03-07 09:07:59 · 3 answers · asked by Jirmiah 1

I have always been completely fascinated by sound. How do I go about majoring in this?

2007-03-07 08:38:39 · 3 answers · asked by treetop1138 1

A. What is the tension force on its cables when it is stationary?

B. What force is needed to accelerate it upward at a rate of 2m/sec/sec?

C.What force is needed to accelerate it downward at a rate of 2m/sec/sec?

2007-03-07 08:38:35 · 3 answers · asked by victoria r 1

what is teh volume of one kg of air in standard atmospheric pressure and at 20 degrees Celsius? what formula do you use i cant think of anything

2007-03-07 08:23:53 · 3 answers · asked by blackbeltcc4 2

Scenario: A car is going along a banked curved road.

Given:
The radius of that curved corner is 50 m
The car's velocity is 30 m/s
The angle of the curved road is 20 degrees

I'm asked to find:
-The normal force acting on the car
-The force of gravity on the car
-The coefficient of friction needed to keep the car from skidding

Here's a picture of the original question.
http://img158.imageshack.us/img158/1486/untitled1ld4.jpg

2007-03-07 08:18:48 · 1 answers · asked by fye 1

2007-03-07 08:16:44 · 9 answers · asked by Anonymous

a motor wiht an operating resistance of 32 Ohm is connected to a votage source. the current in the circuit is 3.8 A. what is the coltage of the source?

show work and get voted as the best answer!

2007-03-07 08:11:23 · 3 answers · asked by Anonymous

Sue and Jenny kick a soccer ball at exactly
the same time. Sue's foot exerts a force of
41.7 N to the north. Jenny's foot exerts a
force of 116.3 N to the east.
a) What is the magnitude of the resultant
force on the ball? Answer in units of N.
b.)What is the direction of the resultant force
(measured from East)? Answer in units of in degree

2007-03-07 07:52:32 · 1 answers · asked by p.b 1

Beth, a construction worker, attempts to pull
a stake out of the ground by pulling on a rope
that is attached to the stake. The rope makes
an angle of 41.3degree with the horizontal.
If Beth exerts a force of 164.4 N on the
rope, what is the magnitude of the upward
component of the force acting on the stake?
Answer in units of N.

2007-03-07 07:51:03 · 2 answers · asked by p.b 1

Is it the cold? If it is...I hate WINTER because of this... I can't flip a light on, restart my computer, turn on the TV or anything without getting ZAPPED...

Is there anyway to like discharge myself without getting zapped? :(

Thanks in advance!

2007-03-07 07:51:00 · 4 answers · asked by DizzyThermal 1

help !!!!!!

2007-03-07 07:45:10 · 4 answers · asked by DANiBBY"] 1

2007-03-07 07:40:54 · 4 answers · asked by leroy.gomery@btinternet.com 1

easy question

2007-03-07 07:05:37 · 2 answers · asked by *nice gurl* 1

What makes it so? This is not homework. Thanks.

2007-03-07 06:56:48 · 3 answers · asked by Dovey 7

I can't fiqure out between two answers.

The energy of a photon
a. is proportional to the wavelength of the light
b. is inversly proportional to the wavelength of the light

2007-03-07 06:56:37 · 6 answers · asked by nicky 1

We cannot tell the difference between water and ice
if there are only few molecules, say 3 or 4, can we?

2007-03-07 06:56:05 · 6 answers · asked by Alexander 6

when you squeeze the empty beer bottle(or any glass bottle) the quarter will jump. Why?

2007-03-07 06:20:55 · 1 answers · asked by RDubs 2

with the cap tightened, why does the test tube sink to the bottom when you squeeze the bottle, and float back up when you let go?

2007-03-07 06:14:02 · 1 answers · asked by RDubs 2

2007-03-07 06:11:40 · 8 answers · asked by shawnp089 2

2007-03-07 06:11:12 · 5 answers · asked by Adina C 1