Physics - February 2007

2007-02-22 20:55:03 · 12 answers · asked by fer 1

2007-02-22 20:45:41 · 7 answers · asked by Anonymous

2007-02-22 20:27:26 · 9 answers · asked by Melroy D 1

why do fireworks explode symmetrically?

2007-02-22 19:29:23 · 4 answers · asked by rhon v 1

Terminal velocity is somewhere around 125 mph, but how quickly does a skydiver go from 0-60?

2007-02-22 19:13:25 · 5 answers · asked by Drew375 1

2007-02-22 19:07:07 · 5 answers · asked by Anonymous

On the surface of Mars, a Martian launches a 2.5kg object off of a 75m tall cliff with initial velocity of 15 m/s an angle of 36.9 degrees above the horizontal. Assume g on Mars is 3.7

a) What are the horizontal and vertical components of the initial velocity?

I got Vox = 15 m/s and Voy = 9 m/s

b) What are the horizontal and vertical components of the object's acceleration once it leaves the Martians tentacle?

I got Ax = 0 m/s^2 and Ay = -3.7m/s^2

c) What is the vertical component of the displacement from when the object is released to when it hits the ground?

I got Y0 = 70 and Y= 0

d) How long is the object in the air?

I got 9.047s for the time

e) And find the horizontal displacement?

And I got 135.705m for the horizontal displacement.

2007-02-22 19:03:28 · 4 answers · asked by hmmm 2

2007-02-22 19:02:07 · 2 answers · asked by robinbatteau 3

2007-02-22 19:00:08 · 3 answers · asked by Matthew K 2

does anyone know the answer to this. how many atoms are in 7.0 ng of carbon?

2007-02-22 18:57:52 · 4 answers · asked by FotoFan85 3

2007-02-22 18:53:10 · 14 answers · asked by nikita_dhameja 1

2007-02-22 18:44:10 · 4 answers · asked by iza 2

What is the speed of the light being emitted from the headlights of a Stationary car & what is the speed of the light being emitted from a car travelling at 100 miles an hour ?

2007-02-22 18:37:11 · 17 answers · asked by Tim 3

Can we store light inside a special tube just as we can store water?

2007-02-22 18:33:33 · 5 answers · asked by rajesh bhowmick 2

Could you please help me with the following questions: I have labelled the questions 1, 2, 3 etc so it's easier..I am not trying to get you to do homework.

Question 1:
How many significant figures are in the following numbers?
a) i) 0.1030
ii) 312.05

b) Using scientific notation, write the following numbers to three significant figures
i) 1026
ii) 0.04555

Question 2:
Alice was working late. When she left work to catch the 6:30 train she found she was nearly 20 minutes late. Thinking back she remembered that she had looked at the clock in the mirror, and seen the time as 5:50. Why was she 20 minutes late for her train?

Question 3:
Use your graphic calculators to evaluate the following. (Express final answers correct to three significant figures.)
a) e= 27.64*(6.38*10^ -2)^2 / (2.48*10^ -4)^2 * 1.07*10^3

Note: * symbol is the multiply sign, / is divide by (the numbers before the / are the numerator and after / is the denominator.

2007-02-22 18:31:20 · 6 answers · asked by Katie M 1

plox

2007-02-22 18:20:35 · 7 answers · asked by gettheledout55 1

2007-02-22 18:20:24 · 2 answers · asked by Robert W 1

A 5.0g bullet is fired horizontally into a 0.5kg block of wood resting on a frictionless table. The block, which is attached to a horizontal spring, retains the bullet and moves forward, compressing the spring. The block-spring system goes into SHM with a frequency of 9.0Hz and an amplitude of 15cm. Determine the initial speed of the bullet.

2007-02-22 17:15:58 · 3 answers · asked by hpage 3

2007-02-22 17:11:43 · 1 answers · asked by Ron Perea 1

Mars gravitional force problem?

Mars has a mass of 6.422x10^23kg anda r adius of 2111 miles, How much does a 1.0 kg object weigh on the surface of Mars (in Newtons)?

I believe the answer is 3.713

2007-02-22 16:58:24 · 3 answers · asked by Anonymous

seconds - velocity
0-0
1-2.5
2-2.5
3-1.25
4-0
5- -1.25
6- -2.5
7- -3.75
8- -3.75
8.5- 0
9- 0
10- 0

Fist number is time 2nd is velocity at time, what would the positions be at the times?

Thanks

2007-02-22 16:55:56 · 2 answers · asked by Anonymous

2007-02-22 16:31:57 · 4 answers · asked by corel_lyn 1

I have been having a lot of trouble with this problem for Physics. I think that it deals with Latent Heat. Can someone explain to me how I do this? I'm so confused!

The problem:
How much energy is needed to melt .225kg of lead so that it can be used to make a lead sinker for fishing? The sample has an initial temperature of 27.3 degrees celcius. and is poured in the mold immediately after it has melted.

I'm not sure if this has anything to do with the problem, but If it helps I know that the specific head capacity of lead: 1.28X10^2 J/kg(degCelcius). I'm really confused, any help is appreciated!

2007-02-22 16:31:14 · 2 answers · asked by Blue 4

when you blow your horn while driving toward a stationary listener, an increase in frequency of the horn is heard by the listener. would the listener hear an increase in the frequency of the horn is he were also in a car traveling at the same speed in the same direction as you are? explain

2007-02-22 16:21:19 · 5 answers · asked by Bayslappers 1

A cat can hear sound frequencies up to 70,000hz. Bats send and recieve ultrahigh-frequency squeaks up to 120,000hz. which hears sound of shorter wavelegnths, cats or bats?

Is this a trick question?

2007-02-22 16:19:17 · 3 answers · asked by Bayslappers 1

In quantum physics, dark matter is invisible. It is quite different from normal luminous matter such as our galaxies, stars, gas, ad planets, because it doesn't give off light or heat. But how do we know it exists if we can't see it? In astrophysics, dark matter can ony be inferred from its gravitational effect on visible matter.

2007-02-22 16:11:06 · 2 answers · asked by watari777ph 1

i neeed sources and websites and help on this project please !!!!

2007-02-22 16:08:52 · 6 answers · asked by ♥ Vanessa ♥ 2

assuming the radius of the earth is 4,000 miles, and the eath rotates through one complete revolution every 24 hours. since the axis of rotation is perpendicular to the equatior, you can think of a person standing on the equator as standing on the edge of a disc that is rotationg throuhg tone complete revolution every 24 hours. Find the linear velocity of a person standing on the equator?

2007-02-22 16:08:40 · 2 answers · asked by Weather dude 1

with a length of 7.64 m and a negligible mass. Starting from the ends of the pole, the skaters pull themselves along the pole until they meet. How far will the 52.0 kg skater move?

2007-02-22 15:45:40 · 3 answers · asked by m n 1

2007-02-22 15:35:17 · 8 answers · asked by popsi 1