Physics - March 2007

In a vacuum, two particles have charges of q1 and q2, where q1 = +3.5 µC. They are separated by a distance of 0.26 m, and particle 1 experiences an attractive force of 3.4 N. What is q2 (magnitude and sign)?

2007-03-12 16:14:42 · 1 answers · asked by Cameron 2

The force of repulsion that two like charges exert on each other is 3.0 N. What will the force be if the distance between the charges is increased to 6 times its original value?

2007-03-12 16:12:31 · 1 answers · asked by Cameron 2

A 70.0 -cm-diameter cyclotron uses a 460 oscillating potential difference between the dees.

What is the maximum kinetic energy of a proton if the magnetic field strength is 0.740 ?

How many revolutions does the proton make before leaving the cyclotron?

The worked solutions would be nice, but even a formula would be soo helpful. I dont know which ones to use?? Please help!

2007-03-12 16:05:24 · 2 answers · asked by melissa j 1

its so gay

2007-03-12 16:01:08 · 13 answers · asked by Release Anwar Al-Awlaki NOW 1

ok, someone sent me this question and I cant for the life of me figure it out!!! Any help would be greatly appreciated!

The Black Box Dilemma
Imagine that a strange black box suddenly appears hanging from the ceiling in your livingroom. You cannot see inside the box nor can you open it.

Experiment #1
Your first experiment determines that the object inside the box rolls.

Exp #2
Your second experiment determines that the object inside the box has wheels.

Exp #3
Determines that the object inside the box has mechanical gears.

Exp #4
determines that the object inside the box is motorized.

Exp #5
determines that the object can hold over 10 individuals.

Exp #6
indicates the the object inside the box travels over set routes.

Exp #7
indicates that at certain times the box is empty and at other times it contains something, even though it has never been opened.

What is the answer.

2007-03-12 15:58:32 · 1 answers · asked by Anonymous

A 2.05 meter tall basketball player takes a shot when he is 6.02m from the basket (at the 3 point line). If the launch angle is 25 degrees and the ball was launched at the level of the players head, what much be the release speed of the ball for the player to make the shot? the basket is 3.05m above the floor.

2007-03-12 15:57:36 · 1 answers · asked by Anonymous

A car is parked on a cliff overlooking the ocean
on an incline that makes an angle of 17.0 degrees
below the horizontal. The negligent driver
leaves the car in neutral, and the emergency
brakes are defective. The car rolls from rest
down the incline with a constant acceleration
of 2.50 m/s^2 and travels 46.0 m to the edge of
the cliff. The cliff is 26.0 m above the ocean.
The acceleration of gravity is 9.81 m/s^2 :
a) How long is the car in the air? Answer
in units of s.
b) What is the car's position relative to the
base of the cliff when the car lands in the
ocean? Answer in units of m.

2007-03-12 15:54:37 · 2 answers · asked by Betty 1

A stone thrown off a bridge 20 m above the river has a initial velocity of 12 m /s at an angle of 45 degrees above the horizontal line.a) what is the rane of the stone? b) at what velocity does the stone strike the water?

2007-03-12 15:54:37 · 4 answers · asked by Anonymous

In lab situations, a projectile range can be used to determine its speed. To see how high this is done, supose a ball rolls off a horizontal tabke and lands 1.5 m out from the edge of the tabke. If the table top is 90cm above the floor, determine a) the time the ball is in the air,and b) the balls speed as it left the table top.
What????? please help!

2007-03-12 15:52:09 · 2 answers · asked by Anonymous

I have a lot of problems that need answering:

1. Calculate the energy needed to raise the temperature of 185 g of copper from 151 degree C to 201 C. Copper's specific heat is 385J/kg C.


2. 75 g of water at 81 C are mixed with 45g of water at 21 C. CAlculate the equilibium temperature of the mixture. Assume no heat is lost or gained by the surroundings.


3. A 50.0g piece of aluminum is heated in boiling water, then transferred into 150.0g of water at 19.5C. After several minutes, the temperature of the water reaches equilibium at 25 C. Assuming no heat is lost or gained by the surroindings, what is the specific heat of aluminum expressed in J/kg C?

5. Howmany joules of thermal energy must be applied to a 2.00-kg block of ice, initially at 0.0C, to melt it and raise its temperature to 20C? (Hf= 3.34 x 10 to the 5 J/kg; C = 4.18 x 10 to the 3 J/kg K)

2007-03-12 15:44:13 · 1 answers · asked by brandon2802 2

Protons having a kinetic energy of 4.50 MeV are moving in the positive x-direction and enter a magnetic field of 0.0510 T in the z-direction, out of the plane of the page, and extending from x = 0 to x = 1.00 m as in Figure P19.65.

Figure P19.65
http://www.webassign.net/sf5/p19_67.gif

(a) Calculate the y-component of the protons' momentum as they leave the magnetic field.
kgm/s
(b) Find the angle between the initial velocity vector of the proton beam and the velocity vector after the beam emerges from the field. (Hint: Neglect relativistic effects and note that 1 eV = 1.60 10-19 J.)
°

2007-03-12 15:40:12 · 1 answers · asked by guitarx313 1

Two long, straight wires cross each other at right angles, as shown in Figure P19.53.

Figure P19.53
http://www.webassign.net/sf5/p19_49.gif

(a) Find the direction and magnitude of the magnetic field at point P, which is in the same plane as the two wires.

(b) Find the magnetic field at a point 29.5 cm above the point of intersection (29.5 cm out of the page, toward you).

2007-03-12 15:39:26 · 1 answers · asked by guitarx313 1

x is in meters
a) calculate the potential energy U(x) associated with this force taking U=0 at x=0
b)find the change in the potential energy and the change in kinetic energy as the particle moves from cx=2m to x=3m


thanks alot !

2007-03-12 15:38:57 · 2 answers · asked by Anonymous

A plane has an airspeed of 400 mph. The pilot wishes to reach a destination 900 mi due east, but a wind is blowing at 50.0 mph in the direction 60.0 degrees north of east. In what direction must the pilot head the plane in order to reach her destination? How long will the trip take?

2007-03-12 15:38:43 · 4 answers · asked by RelientKayers 4

The top end of the fishline is held stationary . The ball is released from rest with the line taut and horizantal. At what angle @ will the fish line break !?!!

2007-03-12 15:22:21 · 2 answers · asked by Anonymous

while sliding it contacts an unstressed spring of negligible mass . The object slides an additional distance x as it is brought momentarily to rest by compression of spring .....FIND THE INITIAL SEPARATION D BETWEEN OBJECT AND SPRING ...............THANKS FOR UR HELP!!

2007-03-12 15:19:19 · 1 answers · asked by Anonymous

A stack of identical aluminum blocks of length l = 13.8 cm and thickness d = 2.0 cm are stacked the right ledge of a table. If we use 7 blocks, how far to the right of the edge of the table can the right edge of the top block maximally reach?

I tried using the equation x(n-1) = x(n) + L/(2n-2) where n is the number of blocks, and L is the length, and then I added 1/2 the length of a block since that equation gives the distance to the middle of the last block. However, that did not work.

What is the minimum height of a stack of blocks for which the left edge of the top block can be located to the right of the right edge of the table?

Since the density is given, couldn't I relate this answer somehow to the first one?

Thanks.

2007-03-12 15:18:07 · 1 answers · asked by Defcon6 2

The only light to reach very far beneath the surface of the ocean is greenish blue. Objects at these depth either reflect greenish blue or reflect no color at all. If a ship that is painted red, green, and white sinks to the bottom of the ocean, how will these colors appear?

2007-03-12 15:01:14 · 3 answers · asked by Jessica456 1

Two long, straight wires cross each other at right angles, as shown in Figure P19.53.

Figure P19.53
http://www.webassign.net/sf5/p19_49.gif

(a) Find the direction and magnitude of the magnetic field at point P, which is in the same plane as the two wires.
Magnitude
T
Direction
into the page
59.0° counterclockwise from the -x direction
59.0° counterclockwise from the +x direction
out of the page
59.0° clockwise from the +x direction
31.0° clockwise from the +x direction


(b) Find the magnetic field at a point 29.5 cm above the point of intersection (29.5 cm out of the page, toward you).
Magnitude
T
Direction
into the page
59.0° counterclockwise from the +x direction
31.0° clockwise from the +x direction
59.0° clockwise from the +x direction
59.0° counterclockwise from the -x direction
out of the page

2007-03-12 14:54:53 · 1 answers · asked by Anonymous

2007-03-12 14:48:04 · 2 answers · asked by Shidel 1

Suppose two beams of white light are shone on a white screen with one beam being shone through a red pane of glass and the other being shone through a blue pane of glass. What color appears on the screen when the two beams overlap? What will happen if the two panes of glass are placed in the path of a single beam?

2007-03-12 14:45:10 · 2 answers · asked by Jackie3421 2

A turtle crawls along a straight line, which we call the x-axis with the positive direction to the right. The equation for the turtle's position as a function of time is x(t)= 50.0 cm + (2.00 cm/s)t- (0.0625 cm/s squared)t squared.
a) Find the turtle's initial velocity, initial position and initial acceleration.
b) At what time t is the velocity of the turtle zero.

Thanks.

2007-03-12 14:43:33 · 1 answers · asked by Anonymous

A convex lens of focal length 15 cm is used as a magnifying glass. At what distance from a postage stamp should you hold this lens to get a magnification of +2

2007-03-12 14:39:06 · 1 answers · asked by Kitana 2

2007-03-12 14:36:00 · 2 answers · asked by Jackie3421 2

A uniform beam of length L is hanging from a point a distance x to the right of its center. The beam weighs W and makes an angle of theta1 with the vertical. At the right-hand end of the beam a concrete block weighing w1 is hung; an unknown weight w hangs at the other end.

1.] If the system is in equilibrium, what is w? You can ignore the thickness of the beam.


2.] If the beam makes, instead, an angle of theta2 with the vertical, what is w?


THANKS in advance

2007-03-12 14:33:58 · 1 answers · asked by squishy 1

in what direction and at what speed does the wreckage move a) if one car is driving north and the other south? b) if one car was driving nirth and the other east?

Now i have the first answer to A but i dont know how to get the second answer because i dont know what the triangle effect is. so if anyone could explain the second answer to me without mentioning the triangle effect please do so, so i can understand this problem.

Thanx!

2007-03-12 14:30:44 · 1 answers · asked by kimberly b 1

1. when passing an oncoming truck on the highway, your car tends to sway toward the truck?
2. the canvas roof of a convertible automobile bulges upward when the car is traveling at high speeds.
3. the windows of older trains sometimes break when a high-speed train passes by on the next track.

2007-03-12 14:05:48 · 9 answers · asked by questionhere 2

lets say you slide down 100, 200, 500 feet

2007-03-12 14:04:44 · 1 answers · asked by jay 2

2007-03-12 13:57:58 · 6 answers · asked by cyclops 1

2007-03-12 13:45:00 · 2 answers · asked by Anonymous