Physics - September 2007

and is that a different time than the time you travel back in?

2007-09-21 14:08:20 · 10 answers · asked by ixat02 2

what is the physics

2007-09-21 13:06:43 · 2 answers · asked by blackheart 1

im doing a science project and i would like to know wut the study of gravity is

if u cud help plz do


plz and ty , Dezz

2007-09-21 12:54:17 · 4 answers · asked by Anonymous

2007-09-21 12:43:17 · 9 answers · asked by Anonymous

2007-09-21 12:00:28 · 1 answers · asked by shall_i 1

Vector A, which is directed along an x axis, is to be added to vector b, which has a magnitude of 8.0 m. The sum is a third vector that is directed along the y axis, with a magnitude that is 7 times that of A. What is the magnitude of A? (Enter your answer to 4 significant figures.)

2007-09-21 12:00:19 · 1 answers · asked by Anonymous

An explorer is caught in a whiteout (in which the snowfall is so thick that the ground cannot be distinguished from the sky) while returning to base camp. He was supposed to travel due north for 5.3 km, but when the snow clears, he discovers that he actually traveled 7.8 km at 46° north of due east.

(a) How far must he now travel to reach base camp?

(b) In what direction must he travel?(counterclockwise from due east)

2007-09-21 11:58:13 · 1 answers · asked by Anonymous

The two vectors and in the figure below have equal magnitudes of 7.0 m and their angles are θ1 = 30° and θ2 = 95°.

a) Find the x and y components of their vector sum r.

(b) Find the magnitude of vector r.

(c) Find the angle vector r makes with the positive x axis

2007-09-21 11:57:04 · 2 answers · asked by Anonymous

In the sum + = , vector has a magnitude of 15.0 m and is angled 48.0° counterclockwise from the +x direction, and vector has a magnitude of 15.0 m and is angled 25.5° counterclockwise from the -x direction. What are the magnitude and the angle (relative to +x) of ?

__________m at _________° counterclockwise from the +x direction

2007-09-21 11:55:16 · 2 answers · asked by Anonymous

An airplane flies at airspeed (speed relative to air) 145km/h. THe pilot wishes to fly due West but there is a 29.9 km/h wind blowing in from North to South.
a) In what direction should the pilot head the plane?
b) What would be the ground speed of the plane (its speed relative to the ground)?

Please explain..mas confusion :( Thanks everyone!

2007-09-21 11:51:25 · 2 answers · asked by Anonymous

For the vectors a = (3.0 m) + (3.8 m), and b = (4.0 m) - (2.8 m), give the x and y components, magnitudes, and directions of the following vector operations.

(a) a + b

(b) b - a


**please give the x and y components, magnitudes, and directions of each

2007-09-21 11:48:09 · 2 answers · asked by sugardaddy8815 1

Am i simplifying this equation correctly?
d= vt + 1/2gt^2 for v = 0 m/s

g= 2d/t^2

can this formula then be used to calculate g?

2007-09-21 11:44:12 · 2 answers · asked by darling_15_15 1

I have no idea what the answer to this would be. Inertia is restistence to change in motion, but I don't understand how my small car made out of index cards and film caps for wheels would exhibit this.

2007-09-21 11:38:23 · 2 answers · asked by Anonymous

2007-09-21 11:33:08 · 3 answers · asked by Anonymous

im building a corner cupboard and thats why i need to know the answer. the traingle is a right triangle and the angle is 90 degrees. the bottom side is 11 1/4 as said before. can you use either sin or cos to find the other two sides or pythagoram therom? some working would help? if not is there any other way the 2 remaining sides can be found?

2007-09-21 11:22:39 · 8 answers · asked by Anonymous

http://en.wikipedia.org/wiki/Image:CarnotCycle1.png

Amount of heat supplied to the body in A->B phase of the cycle is 373.16J
What amount of heat is removed from the body in C->D phase, if Tc is temperature of triple point of water?

2007-09-21 11:10:30 · 2 answers · asked by Alexander 6

If you had 1 speaker (for e.g.) playing music at a certain volume level, what would happen of you had a 1000 speakers all playing at the same volume level...would the volume level stay the same or be increased? Does it depend on the size of the room that the speakers are in...if this is confusing...then compare to 1 person talking to 1000 talking...the sound is louder but is that because everyone is speaking louder to be heard? Would the volume level increse by the amount of speakers (e.g. x1000 if there are a 1000 more speakers) OR is there a mathematical equation to work it out?

2007-09-21 11:06:56 · 10 answers · asked by jenfleur 1

I know water spins around the plughole the other way in the southern hemisphere due to the Cornetto effect but does the poop shoot voofoo valve also twist in the opposite direction for Antipodean dwellers. I always like to try for a nice even right hand thread before I nip one off.

2007-09-21 09:51:15 · 4 answers · asked by Anonymous

highway. a) How many seconds should elapse between two consecutive mile markers if the car's avg. speed is 65 mi/h? b) What is the car's avg. speed if it takes 65 seconds to travel between the mile markers? I'd appreciate any help, thank you

2007-09-21 09:29:13 · 5 answers · asked by Anonymous

A person jumps and reaches a height of 0.8 m. What is their initial velocity?

I have
gravity = -9.8m/s^2
height = 0.8m
final velocity (mid air) = 0
I don't have:
time or intial velocity.

I'm not sure which equation to use?

(this is a theoretical question from a physics text)

2007-09-21 09:28:20 · 7 answers · asked by RogerDodger 1

The atmosphere of this planet is pure helium He4, and its pressure is so low, that each atom of helium almost always unable to collide with another atom of heluim between two bounces off the surface of the planet. In other words, the mean free path significantly exceeds the height of the atmoshpere. The atoms of heluim therefore follow parabolic trajectories between bouncing off the surface.

Temperature of the surface of the planet is To = 128.5 K.
What temperature will be measured by thermometer placed at height H = 1000 above the surface?

(Assume that thermometer 'absolutely reflects' all radiation,
and its temperature is entilery determined by collisions with atmosperic helium atoms)

2007-09-21 09:02:09 · 4 answers · asked by Alexander 6

What will the current be?

2007-09-21 09:01:26 · 2 answers · asked by Anonymous

2007-09-21 08:53:02 · 2 answers · asked by khorshid 1

if a force F acts on an object such that its lever arm is zero, does it have any effect on the object's motion? explain

2007-09-21 08:07:28 · 2 answers · asked by DiMaHaZiaF 1

2007-09-21 07:54:17 · 7 answers · asked by honeyroastedeggroll 1

A hole is drilled through the center of Earth and very long L=100km sealed cylindrical pipe is inserted vertically into the hole. The pipe contains thermally insulated nitrogen gas, which is in equilibrium, has temperature T=400K, and pressure 1atm at the bottom.

Under these conditions the gas can be considered ideal, and pressure of the gas at the top of the pipe is negligible.
Its specific heat Cv = 5/2 R.

The pipe is initially at the surface, and then is very slowly (adiabatically) lowered downward the center of the earth. As gravity decreases, the gas is able to expand and reach higher levels inside the pipe.

What is temperature of the gas when the pipe is half-way down to the center of the earth?

2007-09-21 07:50:50 · 3 answers · asked by Alexander 6

Two mirrors are placed opposite to each other with an object in between Mirror A reflects its reflection into mirror B, an mirror B likewise, and so on. Why do the reflections get smaller and smaller and seem to disappear into infinity (or do they) and not cover the surface of the mirrors? And why do mirrors reverse our appearence?

2007-09-21 07:45:23 · 6 answers · asked by donjamste 1

Time dimension properties
Trying to imagine that there’s a dimension which is elastic & moving with velocity but it changes according to your velocity (but its velocity changes according to your velocity but very high velocity otherwise it can be neglected) imagine that balloon which is moving velocity taking it’s shape of your moving with as your moving through it & it can be rewind again to take all the shapes u made as an evidence for what u did, this is my opinion for time as a body,(EX: try to get any elastic thing & try to move your finger through it then start to return back again u will notice that the elastic body will take all the shapes u did )
But the question is why if you are standing beside a rock for 100 year you will die while rock won’t effect (neglecting external effect like pressure & temperature)?
May be because we r such complicated machine with some chemical reaction which destroy it self by it self
I think that time is only an evidence for what we did & its end is rewinding again like an elastic uncut able balloon to regain again to its beginning point, like an elastic point u start to stretch it from all direction till it became unable to be bigger so it start to regain its original shape a point & all things happened can be regain again, that’s my opinion about time as a body dimension but what if it’s an energy?, I think if time dimension is an unknown energy when its energy lost it starts to regain its shape again but may be faster or slower or same speed ,but its speed is too high as u need huge speed to feel the time changes in your frame relative to other ,but does time dimension has a relation with mass ??
Still no answer for that

2007-09-21 07:06:20 · 1 answers · asked by sherif m 1

2007-09-21 07:05:19 · 3 answers · asked by Doyin 1

The car departs from the surface (1km above sea level), and after quick initial acceleration continues to move towards the center of the earth at constant velocity 100 m/s.

Few seconds into constant velocity phase of the trip, when elevator just crosses sea level, a passneger drops elactic ball on the floor, which continues to bounce elastically from the floor with initial period 1s.

As the car approaches the center of the earth, period of bouncing gradually increases.

What is the period of bouncing half-way towards the center of earth?

2007-09-21 06:57:56 · 2 answers · asked by Alexander 6