Physics - November 2006

After landing on an unfamiliar planet, a space explorer constructs a simple pendulum of length 53.0 cm. The explorer finds that the pendulum completes 96.0 full swing cycles in a time of 126 s.

What is the value of the acceleration of gravity on this planet?
Express your answer in meters per second per second.

2006-11-18 13:49:19 · 3 answers · asked by Theresa C 2

Jupiter is 5.2 times farther from the Sun than Earth is. Find Jupiter's orbital period in Earth years.?

I don't even understand how to attempt this problem.
Please help.

2006-11-18 13:43:29 · 3 answers · asked by vicky p 1

Assume that you have a mass of 50.0 kg. Earth has a mass of 5.97 x 10^24 kg and a radius of 6.38 x 10^6 m.

a. What is the force of gravitational attraction between you and Earth.
b. What is your weight.

This seems like a fairly simple problem, but I don't understand how to set it up and work it out.
Please help.

2006-11-18 13:42:03 · 4 answers · asked by vicky p 1

Assume that you have a mass of 50.0 kg. Earth has a mass of 5.97 x 10^24 kg and a radius of 6.38 x 10^6 m.

a. What is the force of gravitational attraction between you and Earth.
b. What is your weight.

This seems like a fairly simple problem, but I don't understand how to set it up and work it out.
Please help.

2006-11-18 13:24:09 · 3 answers · asked by swimmertommy 1

This image (see link below) shoes a Cavendish appartus like the one used to find G. It has a large lead sphere that is 5.9 kg in mass and small one with a mass of 0.047 kg. Their centers are separated by 0.055 m. Find the force of attraction beween them.

*Image link:
http://img227.imageshack.us/my.php?image=scanob6.jpg

Please help me with this problem.
I don't understand the concepts of formulas involved.

2006-11-18 13:21:13 · 1 answers · asked by swimmertommy 1

A solid brass ball of mass 0.280 g will roll smoothly along a loop-the-loop track when released from rest along the straight section. The circular loop has radius R = 14.0 cm, and the ball has radius r << R. (a) What is h if the ball is on the verge of leaving the track when it reaches the top of the loop? (b) If the ball is released at height h = 6.00R, what is the magnitude & direction of the horizontal force component acting on the ball at point Q?

2006-11-18 13:18:51 · 1 answers · asked by afchica101 1

2006-11-18 13:09:49 · 3 answers · asked by Meder 2

2006-11-18 13:08:49 · 2 answers · asked by Meder 2

I don't even understand how to attempt this problem.
Please help.

2006-11-18 13:07:07 · 4 answers · asked by swimmertommy 1

my boyfriend turned on the light this morning and he said and flickered like it was going to blow then it went fine then a couple of minutes later the whole light bulb exploded and shattered all over him. is this normal? why did this happen?. there is no cover over the light it is just dangling from the roof.

2006-11-18 12:53:41 · 5 answers · asked by Anne 2

know that it is part of the eraser and not the metal fastner or the wood or the black ink in the name stamped inthe side?if they are constantly in motion why doesnt the pencil not begin to blur and dissisipate?

2006-11-18 12:34:27 · 7 answers · asked by gary v 1

for instance an ice cube is solid an maintains it shape,water is fluid.

2006-11-18 12:21:50 · 7 answers · asked by gary v 1

About 1500 Watts/m^2 of sunlight energy strikes the Earth. What are the values of the related electric fields?

1 V/m
8 V/m
150 V/m
1100 V/m


PLEASE HELP!! THANKS!!!!!

2006-11-18 12:11:34 · 3 answers · asked by shellz3 2

please tell me everything time

2006-11-18 12:05:01 · 3 answers · asked by g-maniac 2

well the experiment about the ship in Philadelphia any scientists out there?

2006-11-18 11:07:07 · 3 answers · asked by deaftonez 2

2006-11-18 10:49:32 · 5 answers · asked by Cister 7

2006-11-18 10:41:54 · 5 answers · asked by Cister 7

Compute the acceleration of a block sliding down a 30 degree incline, the coefficient of sliding friction being 0.20

...Thanks

2006-11-18 10:15:31 · 3 answers · asked by knicksfan000 1

how do you solve a problem like this

2006-11-18 09:51:08 · 4 answers · asked by jk 1

2006-11-18 09:27:00 · 36 answers · asked by Big Bruv 2

2006-11-18 09:16:30 · 7 answers · asked by Pierre G 1

The suspended 2:1 kg mass on the right is
moving up, the 1:7 kg mass slides down the
ramp (23 degree angle), and the suspended 8:7 kg mass on the
left is moving down. The coeficient of friction
between the block and the ramp is 0:14meu
The acceleration of gravity is 9:8 m/s2 : The
pulleys are massless and frictionless.

What is the acceleration of the three block
system?
ANSWER: acceleration is 5.52340
so how do tension?
What is the tension in the cord connected to the 2:1 kg block? What is the tension in the cord connected to the 8:7 kg block? Answer in units of N.

2006-11-18 09:14:05 · 3 answers · asked by kavita 1

A student stands on a bathroom scale in an elevator AT REST on the 64th floor of a building. The scale reads 836N

As the elevator moves up, the scale reading increases to 936N, then decreases back to 836N.

Find the acceleration of the elevator.

plz help, and explain if you can
thank you!

2006-11-18 09:12:59 · 3 answers · asked by Alex M 1

if so explain

2006-11-18 08:58:26 · 5 answers · asked by :) 2

Well, I tried it a few times-

1- I lit a match
2- Held it horizontal
3- Watched it burn (till the fire reached my finger: not recommended for kids and silly people... (j/k))


I always observed that the stick was bending upwards as the fire moved on.

Any special reason for such observation?

2006-11-18 08:22:40 · 9 answers · asked by Abhyudaya 6

And man presenting himself as dr greg gave entirely wrong answer without any insight - although I explicitely asked for proof.
Other answers are incorrect too. Therefore, I must repeat the question - please find details in my previous question about two identical balloons. I am warning you that although the answer and the proof does not need any knowledge besides elementary physics, I was posting this question in the alt.physics group for years and nobody was able to answer it. So, if you consider it a challenge please think carefully and give the proof.

2006-11-18 08:12:40 · 2 answers · asked by fernando_007 6

(a) A person throws a rubber lacrosse ball (mass 0.250 kg) vertically upwards
with an initial speed of 9.81 m/s. The ball reaches the top of its trajectory and returns to
the person’s hand, travelling at 9.81 m/s in a downward direction. The positive y-direction
is taken to be vertically upward throughout this Exercise.
(i) Calculate the time the ball was in the air (from launch to the time at which it returned
to the person’s hand.)
(ii) Calculate the change of momentum py of the ball for the interval calculated in (i).
(iii) Based on the definition of impulse as a product of force and time interval, calculate the
impulse Jy delivered to the ball by the force of gravity (i.e., by the weight of the ball) in
the interval calculated in (i). Your answer should be the same as the change of momentum
found in part (ii).
(b) Now the person moves into a parking garage. The lacrosse ball is again thrown vertically
upward with the same initial speed. This time, the ball hits the horizontal concrete ceiling
of the garage 2.45 m above the launch point. The impulsive collision between ball and
ceiling lasts 0.0500 s. Immediately before and after the collision, the ball has the same
speed. However, after the collision the velocity of the ball is vertically downward, rather
than upward.
(i) Calculate the speed of the ball when it hit the ceiling, and find the change of momentum
of the ball during the 0.05 s collision.
(ii) Calculate the impulse (Jy)gravity delivered to the ball by the force of gravity during the
0.05 s collision.
(iii) You should find that the impulse due to gravity is almost negligible during the 0.05 s
collision. What is this impulse expressed as a fraction of the total impulse due to all forces
acting on the ball in the collision?
(iv) Use the impulse-momentum theorem to calculate the impulse (Jy)ceiling delivered to the
ball by the contact force exerted on it by the concrete ceiling.
(v) Calculate the average force exerted by the ceiling on the ball during the 0.05 s collision.

2006-11-18 07:21:50 · 2 answers · asked by Anonymous

2006-11-18 07:02:05 · 5 answers · asked by rck_figo 1

2006-11-18 06:44:50 · 15 answers · asked by geoe41 2

What minimum speed does a 100g puck need to make it to the top of a 3.00m -long, 29.0degree frictionless ramp?

2006-11-18 06:28:10 · 1 answers · asked by abbas g 1