Physics - February 2007

so my group is suppose to design an alarm system (very basic one) in science. our group decided to do a cookie jar alarm and i was wondering if anyone had any idea how i would explain how it will be made and how it will electrically work. i also need to include a diagram. only basic materials that are listed below may be used. (besides the cookie jar)

1 or 2 1.5-V dry cells
3 meters of insulated wire
a light bulb
aluminum foil
paper clips
screws
washers
nails
metal cans
electrical tape
basin or bowl
water
salt
alligator clips

2007-02-07 11:46:36 · 1 answers · asked by Anonymous

for example, will a rise in sea level cause larger waves at the coast?

2007-02-07 11:40:29 · 1 answers · asked by just_jules22 1

Im in a physics club at my university and I was wondering if anyone else is and, if so, what kind of things does your club do for fun at regular meetings and what kind of things it does to boost recruitment. My club is pretty small, there aren't many physics majors, but we would like to recruit from all majors people who enjoy physics. Any Ideas???

2007-02-07 11:32:06 · 1 answers · asked by Bettie_T 2

2007-02-07 11:18:40 · 3 answers · asked by Gideon 1

2007-02-07 11:15:32 · 3 answers · asked by hazel 2

An object initially at rest explodes in two fragments of masses 4.8 kg and 1.8 kg that move in diametrically opposite directions.

2007-02-07 11:09:46 · 1 answers · asked by RhondaJo 2

A 1200kg car moving at 20.5 m/s collides with a stationary car of mass 1500 kg.

2007-02-07 11:06:03 · 3 answers · asked by RhondaJo 2

A prankster drops a water balloon from the top of a building on an unsuspecting person on the sidewalk below.If the balloon is traveling at 32.1 m/s when it strikes a person's head(1.5 m above the ground),neglect air resistance.

2007-02-07 11:02:38 · 2 answers · asked by RhondaJo 2

2007-02-07 10:45:45 · 4 answers · asked by natalie c 1

ok we had to create cardboard boats for my science class, and now we have to write a summary and part of it says:

Archimedes Principle states that "The buoyant force on a body immersed in a fluid is equal to the weight of the fluid displaced by that object." An object floats when its weight is equal to the buoyant force. Describe how this principle applies to the flotation of your boat,

Descrube how you would calculate the buayant force exerted on your boat by the water. What measurements would you take and how would you interpret them?

ok i just put exactly what the paper said, so if anyone can help me please!!!

2007-02-07 10:31:29 · 3 answers · asked by Howdy! 5

its the black that reflects no color and the tempurature so cold not even atoms move plz no jokers or people that just want pionts i want ligit answers i really want to know its.

2007-02-07 10:26:55 · 3 answers · asked by Brandon S 1

A wedge of mass m = 36.1 kg is located on a plane that is inclined by an angle θ = 22.1 with respect to the horizontal. A force F = 308.3 N in horizontal direction pushes on the wedge, as shown. The coefficient of friction between the wedge and the plane is 0.193.

What is the acceleration of m along the plane? Negative numbers for motion to the left, and positive numbers for motion to the right, please.

2007-02-07 10:16:45 · 1 answers · asked by Anonymous

Two blocks on ramps, with friction: A marble block of mass m1 = 539.1 kg and a granite block of mass m2 = 134.4 kg are connected to each other via a rope that is directed over a pulley as shown. Both blocks are located on top of inclined planes with angles α = 35.8 degrees and β = 55.2 degrees, as shown. The rope glides over the pulley without friction, but the coefficients of friction of block 1 and the ramp is μ1 = 0.11, and that between block 2 and the ramp is μ2 = 0.25. (For simplicity, let us assume that the static and kinetic friction coefficients are the same in each case.)

What is the acceleration of the marble block? Please note that the positive x-direction is indicated.

2007-02-07 10:15:40 · 2 answers · asked by aks s 1

Two rectangular blocks are stacked on a table. The upper block has a mass of 4.9 kg, the lower block has a mass of 27.1 kg. The coefficient of kinetic friction between the lower block and the table is 0.3. The coefficient of static friction between the upper and the lower blocks is 0.605. A string is attached to the lower block, and an external force is applied in horizontal direction to pull on the string, as shown. What is the maximum force that one can apply without having the upper block slide off?

2007-02-07 10:14:39 · 2 answers · asked by aks s 1

A ladder of mass m = 37.1 kg and length l = 2.91 m is leaning against a wall, at an angle θ. The coefficient of friction between ladder and floor is 0.301, and you can assume that the friction between ladder and wall is 0.

What is the maximum value that θ can have before the ladder starts slipping? Please specify your answer in radians!

2007-02-07 10:13:57 · 1 answers · asked by aks s 1

One is painted red, the other is painted blue.
Which one has higher temperature?
(assume that they perfectly reflect outside of visible spectrum)

2007-02-07 10:00:50 · 7 answers · asked by Alexander 6

the porsch is 186m behind the scion and traveling at the speed of 24.4m/s. and the scion is traveling at the speed of 18.6m/s. both traveling the same direction.

2007-02-07 09:50:38 · 1 answers · asked by Josh B 1

The choices are: (a):900. (b):1000. (c):1100 (d):1200.
Please give real and sensible answers only. Do explain why ?.

2007-02-07 09:48:20 · 8 answers · asked by duskyprince_007 1

2007-02-07 09:41:05 · 9 answers · asked by Anonymous

If a live electric cable was thrown into the sea, would it kill every fish in that sea? If it was thrust into the Atlantic, for instance, how far would the effect of the electric reach?

2007-02-07 09:34:36 · 5 answers · asked by Angelfish 6

1) How many overtones are present within the audible range for a 2.33 m long organ pipe at 12°C if it is open?

2) How many are present if it is closed?

2007-02-07 09:15:49 · 1 answers · asked by Anonymous

A diver springs upward from a board that is three meters above the water. At the instant she contacts the water her speed is 8.70 m/s and her body makes an angle of 85.0° with respect to the horizontal surface of the water. Determine her initial velocity, both magnitude and direction. (please explain how you get answer)

2007-02-07 09:04:37 · 1 answers · asked by butterflyll23 1

2007-02-07 09:02:41 · 6 answers · asked by Anonymous

its a matching thing.

this force acts on the particles of milk at the surface of a glass of milk.

it can either be volume, pressure or surface tension what do you think? i think its volume but im not sure if that is right.

2007-02-07 09:00:40 · 2 answers · asked by jessica :] 5

2007-02-07 08:59:29 · 10 answers · asked by ? 2

A wire has a length of 5.00*10-2 m and is used to make a circular coil of one turn. There is a current of 2.20 A in the wire. In the presence of a 1.70 T magnetic field, what is the maximum torque that this coil can experience?

How am I supposed to solve If I can not find the magnetic moment? The equation is NIA and A = area. And I have no clue how to find r= radius. I know pi r^2 is gonna factor in this somehow. Thanks.

2007-02-07 08:57:11 · 2 answers · asked by scarletandgray07 1

when a electroscope is charged, the leaves rise to a certain angle and remain at that angle. why dont they rise farther?

2007-02-07 08:55:49 · 4 answers · asked by Anonymous

When a charged particle moves at an angle of 17° with respect to a magnetic field, it experiences a magnetic force of magnitude F. At what angle (less than 90°) with respect to this field will this particle, moving at the same speed, experience a magnetic force of magnitude 2.4F?

Simple Problem, but I am not getting the correct answer. I think my trig is rusty, but I set up two equations and solved for X and I keep getting the wrong answer. Any insight will be awesome! Thanks!

2007-02-07 08:53:32 · 1 answers · asked by scarletandgray07 1

When you are doing a problem like this for an example 95 km _____cm ...When its bigger to smaller do you multiply or divide and when its smaller to bigger do you multiply or divide?

2007-02-07 08:47:32 · 3 answers · asked by Anonymous

What happens to the light ray after it enters the tv camera lense? How does it send a whole picture?

2007-02-07 08:35:08 · 1 answers · asked by brandontremain 3