Physics - January 2007

our knowledge and what we know about things is said to double every three years. so what we know now at that rate will have increased by 1,048,567 in 60 years. did anyone see that show on discovery about 2057? they mentioned we could download every book or movie ever made in the blink of an eye... they didnt say how we'd watch those movies that far in the future. i doubt it'll be sitting on the couch with a bowl of popcorn. not only will the medical industry and science industry use the technolgy but so will the entertainment industry. what if we could watch movies by being in them, kind of like virtual reality? or, say, a holodeck type set up like you see in the matrix except we can leave whenever we want. what if we put in "the illusionist" and became a spectator in the crowd? or to take it a step further, what if we could be on of the characters, alternate scenes and endings would have to be put in so the movie we're experiening matches the decisions we make. so could it happen?

2007-01-31 11:15:07 · 4 answers · asked by Boomer 1

four 1.0 g spheres are dropped
(in a square shape, each 1cm from eachother to form the square, 1 sphere at each corner)

What is the speed of each sphere when they are very far apart?

each sphere is 10nC and positively charged

2007-01-31 11:12:00 · 1 answers · asked by Anonymous

Can you intercept nuclear bomb, if so can you stop chain reaction and radiation ?I was inspired by other question I was answering.

2007-01-31 11:02:19 · 6 answers · asked by blazkiar 2

How does fire propagate? Where do the flames tend to go? How can be modelled by a heat source? Radiation blackbody at a constant temperature? Does the heat flow have any preference? Does it follow any rule?

Thenks

2007-01-31 11:02:13 · 4 answers · asked by borjamolera 1

I need to know the applications of 2 different dynamos// plz plz plz help its for tomoz

2007-01-31 10:59:26 · 8 answers · asked by Anonymous

like fire, ice, water... etc.

2007-01-31 10:44:59 · 12 answers · asked by Anonymous

2007-01-31 10:41:54 · 3 answers · asked by jocelyn a 1

2007-01-31 10:34:35 · 5 answers · asked by _MeXiCaN713_ 1

A friend of mine told me that hot water pipes in a house will freeze quicker than cold water pipes. This seems completely counter intuitive to me, and seem to violate laws of physics. It sounds like an urban legend to me. I tried to argue that it must have to do with the relative position of the pipes is some cases. He stated it had to do with an alteration on the property of the water (which I doubt). If it is true, I would like someone to explain to me the science behind it, which is why I am posting it as a science question rather than a plumbing one.

2007-01-31 10:31:26 · 16 answers · asked by Jeffrey P 5

A golf ball is hit with an initial angle of 36.9o with respect to the horizontal and an initial velocity of 83.9 mph. It lands a distance of 89.5 m away from where it was hit. By how much did the wind resistance reduce the range of the golf ball?

2007-01-31 10:30:18 · 3 answers · asked by Anonymous

A football is punted with an initial velocity of 27.3 m/s and an initial angle of 54.1 degrees. What is its "hang time", i.e. the time it takes for the football to hit the ground again.

2007-01-31 10:29:47 · 2 answers · asked by Anonymous

What is the maximum height above ground you can achieve with a projectile of mass 0.65 kg, launched from ground level, if you are able to give it an initial speed of 78.7 m/s?

2007-01-31 10:25:46 · 4 answers · asked by adam s 1

If you want to use a catapult to throw rocks, and the maximum range you need your projectiles to have is 0.99 km, what is the value of the initial speed that you need to give your projectiles as they leave the catapult?

2007-01-31 10:25:14 · 1 answers · asked by adam s 1

A baseball is thrown with a velocity of 23.9 m/s at an angle of θ = 27.4° above horizontal. What is the horizontal component of the ball's velocity at the highest point of the ball's trajectory?

2007-01-31 10:19:00 · 1 answers · asked by aks s 1

You are walking on a moving walkway in the airport. The length of the walkway is 57.1 m. If your velocity relative to the walkway is 2.99 m/s, and the walkway moves with a velocity of 1.71 m/s, how long will it take you to reach the other end of the walkway?

2007-01-31 10:18:18 · 1 answers · asked by aks s 1

An airplane has an air speed of 112.2 m/s and flies due North, but the wind blows from the Northeast to the Southwest at 34.5 m/s. What is its actual ground speed?

2007-01-31 10:17:36 · 1 answers · asked by aks s 1

An ideal projectile of mass 0.890 kg is launched with an initial angle of 45.5 degrees with respect to the horizontal and an initial speed of 27.1 m/s. As the projectile reaches the top its trajectory, what is the magnitude of the acceleration it is experiencing?

2007-01-31 10:16:54 · 2 answers · asked by aks s 1

wheel/axle, lever, pulley, inclined plane, screw
any others are great i need to identify input/output force for each please help i understand what input/output force is but i cant identify it for the simple machines thank you so much

2007-01-31 10:12:36 · 2 answers · asked by anonymous 2

Stacy runs at a speed of 5.0 m/s and dives onto a sled that is initially at rest at the top of a frictionless snow-covered hill. After she and the sled have descended a vertical distance of 5 m, the hill levels out a big and her brother, who is initially at rest, jumps onto the sled and together they continue down the hill. What is their speed at the bottom of the hill if the total vetical drop is 16 m? Stacy's mass is 40kg, the sled is 5 kg, and her brother is 60kg.

2007-01-31 10:11:29 · 2 answers · asked by Patty M 1

Assume that 3.06 x 106 kJ are needed to heat a swimming pool. If this energy is derived from the combustion of liquid ethanol (CH3CH2OH) at standard conditions (25 oC and 1 atm) what volume in liters of ethanol must be burned?




The heat of combustion of ethanol is 1366.818 kJ/mol. The density of ethanol is 0.789 g/cm3

2007-01-31 10:05:25 · 1 answers · asked by Anonymous

A moving object has a kinetic energy of 200 J and a momentum with a magnitude of 33 kg*m/s. Determine the mass and speed of the object.

2007-01-31 09:45:25 · 2 answers · asked by Patty M 1

east to west.
What is her resulting velocity relative to the ground?

2007-01-31 09:37:35 · 4 answers · asked by Anonymous

2007-01-31 09:21:24 · 6 answers · asked by casaouia 2

1. A gun is fired vertically into a 2.00 kg block of wood at rest directly above it. If the bullet has a mass of 0.021 kg and a speed of 250 m/s, how high will the block rise into the air after the bullet becomes embedded in it?
2. A 1700 kg car moving south at 14.5 m/s collides with a 2500 kg car moving north. The cars stick together and move as a unit after the collision at a velocity of 5.46 m/s north. Find velocity of the 2500 kg car before the collision.
3. A moving object has a kinetic energy of 200 J and a momentum with a magnitude of 33 kg*m/s. Determine the mass and speed of the object.
4. A 68.3 kg student stands in the middle of a frozen pond having a radius of 5 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty he throws his 2.8 kg physics book horizontally toward the north shore at a speed of 6 m/s. How long does it take him to reach the south shore in seconds?

2007-01-31 09:01:43 · 2 answers · asked by Patty M 1

would your seatbelt be safe and comfortable in real life? reflect on the importance of seatbelts??

i have this question in my Pisics class??
what do you think??

2007-01-31 08:27:29 · 14 answers · asked by Anonymous

2007-01-31 08:15:47 · 8 answers · asked by Anonymous

I feel flourecent light are responsible for may medical problems including ADD, ADHD, and Eplilepsy. I feel even non epileptics get auras or partial siezures form these light bulbs. I though we should ban the flourecent light while now I am hearing they want ban incadecent. This is ridiculous. How do you feel about this ban or efforst to use more flourecent lights. These lights flicker at a very high speed which you do not see but your brain does and I feel this is what is causing so many people to have problems. I think kids will do better in school if the incedecnt light bulb is used.

2007-01-31 08:13:37 · 6 answers · asked by curthauer 2

what happens when a force is applied to a moving object in the dirction opposite its movement? (think of throwing a baseball at a brick wall)?????

2007-01-31 08:06:51 · 4 answers · asked by Anonymous

You cant invent something that already exists or add something to something that already exists...

2007-01-31 07:38:51 · 5 answers · asked by Hazel-Iris 2

2007-01-31 07:38:33 · 8 answers · asked by Lindsey P 2