Physics - April 2007

What type of lens is it and what is it focal length?

2007-04-26 04:05:25 · 2 answers · asked by Anonymous

2007-04-26 03:55:14 · 3 answers · asked by Anonymous

eye from a point on the tip of your nose if your pupil diameter is 5.5 mm?

2007-04-26 03:29:02 · 1 answers · asked by Anonymous

2007-04-26 03:10:41 · 1 answers · asked by k1ngfischer 3

http://www.collegeboard.com/prod_downloads/ap/students/physics/ap06_frq_physics_c_mech.pdf

2007-04-26 03:05:33 · 1 answers · asked by Anonymous

2007-04-26 02:55:58 · 1 answers · asked by lin 1

if i sit on a stool with my arms outstretched and then i bring my arms together to increase my angular speed...did i increase my kinetic rotational energy? i recognize that while one factor ("I" the moment of inertia) goes down but i'm not sure if this is equivalent to the square of my angular speed

2007-04-26 02:40:57 · 4 answers · asked by mikeo853 1

Ive always been told you would stick to the roof and even seen it in movies. Is it true? It seems like gravity would act the same on both the elevator and you, making you fall at the same rate as the elevator. So you would feel weightless, but your feet would be touching the floor of the elevator on the fall.

2007-04-26 02:32:56 · 5 answers · asked by lol b 1

2007-04-26 00:12:36 · 5 answers · asked by facelessdefacer 1

2007-04-25 22:27:51 · 5 answers · asked by Anonymous

can a body be in rest and motion at the same time. I know it can! but i need a proper justification for the statement above.

2007-04-25 21:03:02 · 8 answers · asked by Anonymous

#1) the gravitational force between two objects (mass1= 10 kg, mass2=6 kg) is measured when the objects are 10 centimeters apart. if the 10 kg is replaced with 20kg mass and the 6kg mass is replaced with 12kg mass, how does the new gravitational attraction compare to the first one measured?

#2)the gravitational force between two objects (mass1= 10 kg, mass2=6 kg) is measured when the objects are 10 centimeters apart. if the distance between then is increased to 40 centimeters, how does the new gravitational attraction compare to the first one measured?

#3)The gravitational force between two objects (mass1=1kg, mass2=2kg) is measured when the objects are 12 centimeters apart. if the 1kg mass is replaced with a 5kg mass, and the 2 kg mass is replaced with a 4 kg mass, and the distance between the objuects is reduced to 4 centimeters, how does the new gravitational attraction cmpare to the first one measured?

2007-04-25 20:54:58 · 3 answers · asked by nootherlikeme 3

the water ill freeze
the water will boil
the water will remain as before
give explanation

2007-04-25 19:59:08 · 5 answers · asked by sidh 1

a certain row boat has the shape of a box: a rectangular bottom and rectangular sides. Its bottom is 1 meter wide and 3 meters long. the sides are 40 cm high. the empty mass of the boat is 50 kg. four men, 100 kg each go for a ride in the boat across a fresh water lake. With all the men in the boat, how many cm of the sides of the boat will remain above the water? convert kg to grams.

2007-04-25 19:49:56 · 1 answers · asked by trust2400 3

Q) a winch is used to raise a 200kg load. the maximum power of the winch is 5kW. calculate the greatest possible acceleration of the load when its speed is 2m/s, and the greatest speed at which the load can be raised.

answers: 0.2m/s^2, 2.55m/s

2007-04-25 19:48:38 · 1 answers · asked by Anonymous

what is the objects density in g/cc?
when placed in water will it float?
how many ml of water will it displace?

2007-04-25 19:47:10 · 2 answers · asked by trust2400 3

If frequency is the unser, than frequency will solve the travel in spaces

2007-04-25 19:25:24 · 1 answers · asked by DOREL 1

If one ages slower while traveling at the speed of light in relation to someone stationary then is that person in essence traveling faster than the speed of light? Take for example: if a light beam was directed at a mirror 1 light year away we would expect to see the return of the light in 2 years (stationary time for us). If a person were to be travelling alongside that lightbeam also at the speed of light then we would expect them to return in 2 years as well (stationary time for us). But according to Einstein the person travelling would not age as much as the stationary person (ie: something less than 2 years) and if that is true then didn't the person travel faster than the speed of light? (he covered 2 light years physical distance in less than 2 years of his life)

2007-04-25 19:04:36 · 10 answers · asked by rlengland4 1

If there is a posibility that multiple universes exist, vibrateing on different cords under diffreent vibrations, and that you exist on each of them then we are in big troble. The laws of what we know, if they are based on vibration, the lows should be complicty different. We might be nothing but a high frickquency life form, in witch case we should learn some more, and see if frickquency is cuasing what at the end of the day we experience.

2007-04-25 18:52:18 · 2 answers · asked by DOREL 1

We have no answer how energy as the primordial existence came to exist .If it is created, is it a continuos process or limited by time.What happens the universal law of biology,chemistry, physics and Mathematics,Who is the founder of these laws?.

2007-04-25 18:35:09 · 4 answers · asked by Anonymous

2007-04-25 18:25:34 · 9 answers · asked by Anonymous

Ok, we know that as you approach the speed of light, your mass increases, and we also know that mass bends space, causing other objects to be "pushed" towards each other.

So my question is, If I am in a spaceship moving very close to the speed of light, and the mass of the ship and all of it's contents are approaching infinity, wouldn't the gravity that these masses produce also approach infinity? If so then wouldn't the ship collapse upon itself and get crushed by it's own gravity? At some point in velocity, your ship may have so much mass that the whole thing becomes a travelling black hole.

Am I even close with these ideas?

2007-04-25 18:02:17 · 5 answers · asked by Anonymous

at any point in the future. is it possible to unfold the mysterious of this universe.

2007-04-25 17:52:20 · 15 answers · asked by ramappa j 2

I'm can't really find anything on it. I know that it is the process by which ice melts under pressure. Why does it?

2007-04-25 17:38:30 · 1 answers · asked by addict for dramatic 4

A. only at low pressures and large volumes.
B. only at high temperatures.
C. only at large volumes and large pressures.
D. at all pressures and volumes.

2007-04-25 17:33:01 · 5 answers · asked by 11111111111111111111111111111111 1

A student wants to determine the coefficients of static friction and kinetic friction between a box and a plank. She places the box on the plank and gradually raises one end of the plank. When the angle of inclination with the horizontal reaches 25°, the box starts to slip, and it slides 2.4 m down the plank in 4.1 s at constant acceleration.

(a) What is the coefficient of static friction?
(b) What is the coefficient of kinetic friction?

2007-04-25 17:28:23 · 2 answers · asked by Anonymous

Ive been working on this physics problem... but i'm stuck.. i've been able to calculate only 2 of all (I wrote them on the line).. but the rest i don't know exactly.. on the second answer i get .6999 but i think it's wrong.. can anyone help me a bit?

The motion of an object is described by the equation below.
x = (0.70 m) cos("pi"t/4)

(a) Find the position of the object at
t = 0 ___.7______
and at
t = 0.60 s. ________

(b) Find the amplitude of the motion.
_____.7_____m
(c) Find the frequency of the motion.
__________Hz
(d) Find the period of the motion.
_________S

2007-04-25 17:27:15 · 2 answers · asked by Emma 1

speed V. The work done by the pull of the string on the stone in one complete revolution is

A. zero.
B. 2πmVsquared
C. 2πmVsquared divided by R
D. 2πmv divided by R

2007-04-25 17:24:19 · 1 answers · asked by Anonymous

resistive force acting on the train is

A. 50 MN.
B. 200 kN.
C. 20 kN.
D. 200 N.

I got B, i pretty certain, if its not please explain your answer, i doubt i made arithmetic mistak,e and explain your unit usage.

2007-04-25 17:22:12 · 0 answers · asked by Anonymous

impulse received by the ball is
A) m(v2+v1)
B. m (v2-v1)
C. m (v2squared + v1squared)
2 1 m(v +v).
D. m (v2 squared minus v1 squared)

2007-04-25 17:20:50 · 2 answers · asked by Anonymous