Physics - September 2007

2007-09-22 03:51:02 · 1 answers · asked by JAI VIGNESH 1

Physics. We did this thing with a motion sensor and see how the speed changes with steeper slopes. The steeper the slope, the faster the car goes. Why?? Gravity?? Plz explain.

2007-09-22 03:42:09 · 12 answers · asked by sαrαн♥mıss ©υяlz 3

Suppose that the horse pulls on the rope with a force of 7900 N at an angle of 18° to the direction of motion of the barge, which is headed straight along the canal. The mass of the barge is 9800 kg, and its acceleration is 0.10 m/s2. What are the magnitude and the direction of the force on the barge from the water?

2007-09-22 02:53:18 · 2 answers · asked by tosinjesu 1

IF you could dig a hole to the center of the Earth and stand there?

2007-09-22 02:05:36 · 11 answers · asked by Ste B 5

Hi guys were making a project for physics class. We are currently discussing about law of inertia. Now our task is to make a kelly doll. To be more precise here's an example: A punching bag which you hit it and will come back to you... Something like that. So how do I make it? Any steps?

2007-09-22 01:51:01 · 2 answers · asked by help 1

2007-09-22 01:03:48 · 2 answers · asked by Anonymous

the height of an object thrown in the air is:

h= -9.8t + 129.8(1- e^(-t))

find:
1) max height in meters (2 decimal pts)
2) time taken to return to the ground in seconds (2 deci pts)

2007-09-22 00:59:46 · 1 answers · asked by Anonymous

does anyone know where there is a video of anything coming up to absolute zero? You know, like the effects and outcome. if not, pictures would be fine

2007-09-22 00:46:57 · 3 answers · asked by Boeing 777 2

2007-09-22 00:25:32 · 7 answers · asked by ry 1

2007-09-22 00:04:50 · 3 answers · asked by JAMES 4

NEED HELP......URGENTLY! xx

2007-09-21 23:53:44 · 6 answers · asked by Anonymous

nuclei is in the center and the electrons revolving around the nuclei

2007-09-21 22:03:45 · 3 answers · asked by Anonymous

Plz give logical and descriptive answers.

2007-09-21 21:11:16 · 4 answers · asked by Anonymous

Derive an expression for the terminal speed vt of a sphere falling in a viscous fluid in terms of the sphere's radius r and density p and the fluid density n, assuming that the flow is laminar so that Stoke's law is valid. Hint: Use FBD

2007-09-21 20:46:09 · 3 answers · asked by Anonymous

or does it act the same way water inside a cup, would, when you rotate the cup?...

give me a good reazon... this aint my homework, i totally randomly came up with this... as i looked at the sky.

think about it. we all know that wind is what mainly drives clowds around... however. Imagine there is not wind...

would the movement of the clowds be due to the rotation of the earth while the clowds stay in a single spot?...

any ideas?...

2007-09-21 20:30:46 · 4 answers · asked by alb_spec 2

How does leaning inwards towards the centre of the circular motion for a cyclist prevent him from slipping?

2007-09-21 20:20:42 · 3 answers · asked by Anonymous

2007-09-21 20:05:12 · 11 answers · asked by Anonymous

Explain why we don't water plants when strong sun light is present

2007-09-21 19:58:33 · 4 answers · asked by harry4 2

It means mass of matter always remain same. what about human beings, animals and plants, they grow from a tiny cell and grow to a mass of 100 kg to many many tonnes. how about that new mass or new matter. For example a whale is created from a tiny cell ( thats the matter, having mass of few ounces) and grows to several tonnes. it is like a new matter created of several tonnes.isn't it.

2007-09-21 19:20:48 · 3 answers · asked by Sir 4

2007-09-21 18:10:43 · 3 answers · asked by krypto'nstreaky 2

You are traveling at 110m/s.
An apple over your head is moving 110m/s.

How fast is the apple traveling relative to you?

2007-09-21 17:34:50 · 3 answers · asked by XzoeyX 2

You are sitting in a bus that is traveling along a straight, level road at 110 m/s. How fast are you traveling relative to the road? Answer in m/s.

2007-09-21 17:09:40 · 4 answers · asked by XzoeyX 2

Cc is centimetres cube.

2007-09-21 17:03:12 · 4 answers · asked by kooldude 1

An object is observed to fall from a bridge, striking the water below 2.9 s later.

(a) With what speed did it strike the water? (m/s)

(b) What was the average speed during the fall? (m/s)

(c) How high is the bridge? (m)

2007-09-21 16:01:34 · 3 answers · asked by ariddlegirl 1

True or False

2007-09-21 15:30:34 · 3 answers · asked by Anonymous

Since the dome of the Van de Graaf carries a positive charge, it has an excess of electrons.
True or False

2007-09-21 15:26:54 · 3 answers · asked by Anonymous

If I divide 1.269 cm, calculated from a micrometer to 4 significant figures, by 2 (an exact value), and get 0.6345 cm (4 sig figs, as far as my teacher's concerned), how many sig figs should I round it to?

Should I round it to:
4 sig figs? [no rounding] (multiplication rule)
3 sig figs? (addition rule)

2007-09-21 15:17:35 · 3 answers · asked by Billy E 1

Here are some questions I need help with: Please show work and explain in the best detail thanks. Please help me determine a direction for each question aswell.

1. Roget "The Rocker" Clemends can throw a baseball at 140 km/h. If Roger were to throw the ball straight up, determine the following:
a) How high will the ball go, remember that the acceleration due to gravity is 9.8 m/s^2.
b)How long will it take for the ball to reach it's highest point?
c)How long will it take for the ball to come back down?
d)How fast will it be going when it hits the ground?

2. Outside of a certain high-rise apartment building you observed a ball strike the ground at 37 m/s exactly 4.2 s after hearing someone yell "Look out Below!" Knowing that the accleration due to gravity was 9.8 m/s^2, and that each floor is 2.5 m high, which floor do you think the ball was thrown from?

2007-09-21 15:13:45 · 5 answers · asked by Anonymous

An object is observed to fall from a bridge, striking the water below 3.09 s later.
(a) With what speed did it strike the water?

(b) What was the average speed during the fall?

(c) How high is the bridge?

2007-09-21 14:58:14 · 3 answers · asked by Anonymous

In an arcade video game, a spot is programmed to move across the screen according to x = 8.00t - 0.800t3, where x is distance in centimeters measured from the left edge of the screen and t is time in seconds. When the spot reaches a screen edge, at either x = 0 or x = 15.0 cm, t is reset to 0 and the spot starts moving again according to x(t).
(f) When does it first reach an edge of the screen after t = 0?

A motorcyclist who is moving along an x axis directed toward the east has an acceleration given by a = (6.1 - 2.0t) m/s2 for 0 t 6.0 s. At t = 0, the velocity and position of the cyclist are 3.2 m/s and 7.3 m.
(a) What is the maximum speed achieved by the cyclist? (m/s)
(b) What total distance does the cyclist travel between t = 0 and 6.0 s? (m)

2007-09-21 14:56:11 · 2 answers · asked by dunnohow 4