Physics - March 2007

plz solve it fast

2007-03-05 17:59:48 · 1 answers · asked by **vinny** 2

plz can u solve it

2007-03-05 17:57:10 · 2 answers · asked by **vinny** 2

2007-03-05 17:52:31 · 12 answers · asked by ambili 1

Why is an airplane moving through the air not an example of projectile motion?

2007-03-05 17:07:56 · 1 answers · asked by Anonymous

2007-03-05 16:31:12 · 3 answers · asked by krimpy 1

A particle moving in the x direction is being acted upon by a net force F(x) = C(x^2), for some constant C. The particle moves from x initial=L to x final= 3L . What is (delta K), the change in kinetic energy of the particle during that time?
Express your answer in terms of C and L.

I keep getting this answer wrong and I have no idea why. Thanks for the help in advance guys :D

2007-03-05 16:06:37 · 2 answers · asked by Anonymous

Try this! Hold your right hand out with your palm perpendicular to the ground, as if you were getting ready to shake hands. You can't hold anything in your palm this way because it would fall straight down. Use your left hand to hold a small object, such as a ball or a coin, against your outstretched palm, then let go as you quickly swing your hand to the left across your body, parallel to the ground. You'll find that the object stays against your palm, without slipping or falling, if your hand maintains a certain minimum acceleration a_min."

Suppose the object's mass is 41.0 g, with mu_s = 0.750 and mu_k = 0.400 . Determine a_min.

2007-03-05 16:00:28 · 1 answers · asked by RelientKayers 4

2007-03-05 15:58:03 · 10 answers · asked by jackc396 2

I need help I am doing something wrong here

question:
the moon orbits the earth at a distance of 3.85 X10^8m. assume that this distance is between the centers of the earth and the moon and that the mass of the earth is 5.98 X 10^24 kg.
find the period (in days) for the moon's motion around the earth?
I have:::::
time period of satelite T = 2n squared {(R+h) squared + Gm)
mass of earth m = 5.98 *10^ 24 kg
distance of the moon's orbit = h=3.85 * 10 ^ 8 m
radius of the earth = R = 6.37 * 10 ^ 6 m
gravitational constant = G = 6.67 * 10 ^ -11 N.m ^ 2 / kg squared
by subtracting all the values
T = 2 n squared {(6.67 * 10 ^ 6m + 3.35 * 10 ^ 8 m) ^ 2 / 6.67 * 10 ^ -11 N.m ^ 21 kg ^ 2)(5.98 * 10 ^ 24 kg)} =
12306.5s = (12306.5 / 86400) day = 0.142 days
but....
this is not one of the answers
the answers are:::::
a. 26.9 days
b. 28.1 days
c. 29.2 days
d. 27.5 days
e. 28.7 days
so!!!!!!! what am I doing wrong!!!!!!!
please help I don't understand

2007-03-05 15:50:30 · 2 answers · asked by tico 1

2007-03-05 15:40:43 · 6 answers · asked by Anonymous

I am having problems with this problem can someone tell me what I am doing wrong I can not find what U =
the question
a 1500 kg car is traveling with a speed of 15 m/s.
what is the magnitude of the horizontal net force that is required to bring the car to a halt in a distance of 50.0 m?
this is what I have but it does not add up!
F=ma
a can be obtained from V squared - U squared =
-2as
V = 0 final velocity
a = U squared / 2s
F = m (U squared / 2s)
m = 1500 kg
U = ?
s = distance = 50.0 m

2007-03-05 15:33:32 · 3 answers · asked by tico 1

If everythign in the universe is made of strings and they are all (except for gravitons) attached to "our brane" then what is the brane made of?

2007-03-05 15:31:09 · 1 answers · asked by Anonymous

Fred is on a cliff 27m above the ocean w. a acceleration of 80kg. what is his velocity when he hits the water

2007-03-05 15:30:32 · 4 answers · asked by Anonymous

Auniform horizontal disk of mass M and radius R is rotating about the vertical axis through its center with an angular velocity ώ. when it is placed on a horizontal surface, the coefficient of kinetic friction between the disk and the surface is μk . (a) Find the torque dτ exerted by the force of friction on a circular element of raduis r and width dr. (b) Find the total torque exerted by friction on the disk. (c) Find the time required for the disk to stop rotating.

2007-03-05 15:28:07 · 2 answers · asked by cute b 1

2007-03-05 15:27:37 · 2 answers · asked by marissa p 1

2007-03-05 15:22:19 · 4 answers · asked by Anonymous

This is for a sceince experiment at school. I can't find anything for this subject. Please help!!! Or you could just try it! :o)

2007-03-05 15:14:56 · 6 answers · asked by Anonymous

is tackled by a 95 kg opponent running north at 3.0 m/s. If the collision is perfectly inelastic, calculate each of the following.

(a) the velocity of the players just after the tackle_____m/s

(b) the kinetic energy lost as a result of the collision_____J

and why is there energy missing?

stuk one this one guys- need help. Thanks ;)

2007-03-05 15:09:08 · 1 answers · asked by cosmo 1

2007-03-05 14:56:40 · 5 answers · asked by Julie 2

Heres a crappy diagram of what the problem looks like:
<---[12kg]----[20kg]----[16kg]

Three boxes are tied together and are pulled forward on a frictionless surface by a rope with a tension of Ft=12N.

a) Write Newtons 2nd law equation for the horizontal forces on each box individually. (No numbers allowed)


If someone could write one of these, or all of them so I can see what to do, a few people have written them for me but they keep putting numbers in them and I dont know how to take them out.

2007-03-05 14:56:25 · 4 answers · asked by Ruphert J 1

Explain how a shirt can look green even though the light falling on it contains red, blue, and green. The other one is: Describe a way to use two prisms to remove the colour yellow from a beam of sunlight.

2007-03-05 14:51:51 · 3 answers · asked by ? 3

A sharp image is located 76.0 mm behind a 64.0 mm focal-length converging lens.
* Find the object distance by calculation.
.................................cm.

2007-03-05 14:49:10 · 4 answers · asked by Anonymous

A test charge of +9 x 10-6 C experiences a downward electrostatic force of 15 N when placed at a certain point in space. What are the magnitude and direction of the electric field at this point?

2007-03-05 14:25:39 · 1 answers · asked by bibun 2

I ALWAYS TRY TO ASTRAL PROJECT I NEVER GET ANYWHERE CUZ OF NOICES AND STUFF AROUND ME DONT LET ME CONCENTRATE IS THERE ANY FAST WAY TO CONCENTRATE

2007-03-05 14:25:32 · 6 answers · asked by angellokito 2

I am defining words for my science class... I have defined the term speed but average speed is also one of my words... I am not quite sure what average speed is... or what the difference between speed or average speed is...

2007-03-05 14:14:48 · 5 answers · asked by Julie 2

does anyone think that time is an illusion? The point of power is always in the present moment? there is no beginning, there is no end, everything is NOW?

2007-03-05 14:12:28 · 2 answers · asked by Ash4ElishaCuthbert 4

A team of dogs drags a 73.1 kg sled 3.08 km over a horizontal surface at a constant speed. The coefficient of friction between the sled and the snow is 0.235. Find the work done by the dogs and the energy lost due to friction.

2007-03-05 14:11:36 · 1 answers · asked by guardchic05 2

A canoe of mass 70kg with a paddler of mass 55 kg are in a river. If the river's current exerts a force of 15N [E] while the paddler is paddling with an average force of 22N [N38W], find the acceleration of the canoe and paddler. Use both component and trignometric method.

2007-03-05 14:10:32 · 1 answers · asked by Anonymous

A gymnast is performing a floor routine. In a tumbling run she spins through the air, increasing her angular velocity from 3.00 to 4.45 rev/s while rotating through one-half of a revolution. How much time does this maneuver take?

2007-03-05 14:08:20 · 2 answers · asked by dawgs1918 1

the cylinder and pulley turn without friction about stationary horizontal axles that pass through their centers. A light rope is wrapped around the cylinder, passes over the pulley, and has a 3.00-kg box suspended from its free end. There is no slipping between the rope and the pulley surface. The uniform cylinder has mass 5.00 kg and radius 40.0 cm. The pulley is a uniform disk with mass 2.00 kg and radius 20.0 cm. The box is released from rest and descends as the rope unwraps from the cylinder.

Find the speed of the box when it has fallen 1.50

2007-03-05 14:07:30 · 1 answers · asked by missincredible 1