Physics - February 2007

Two children are playing a game in which they try to hit a small box on the floor with a marble fired from a spring loaded gun that is mounted on a table. The target box is 2.20 m horizontally from the edge of the table. Bob compresses the spring 1.10Cm, but the center of the marble falls 27.0cm short of the center of the box. How far should rob compress the spring to score a direct hit? assume neither the spring nor the ball encounters friction from the gun.

2007-02-25 09:12:46 · 1 answers · asked by Anonymous

I had this question in college, and I remember the prof solving it using vectors, but it has been so long ago, I cannot remember anymore. All I remember for certain is that one of them is easier than the other. I have to say, it was one of the better questions I've been asked in science.

2007-02-25 09:12:14 · 9 answers · asked by MrZ 6

Does anyone know the formulas for velocity and displacement and how to calculate each? With examples if possible

2007-02-25 09:07:00 · 3 answers · asked by Anonymous

I had this question in college, and I know it has something to do with vectors, but I can't remember how to solve this problem.

2007-02-25 09:06:57 · 4 answers · asked by MrZ 6

A solid disk rotating at 33rpm is slowed by friction, stopping after 10 seconds. Find the angular aceleration in rad/s²

2007-02-25 08:57:02 · 1 answers · asked by dqmiddleman 2

please help me by answering the questions below and explain the steps so i can make sure i did these right.
thnk you.!!

A.) maria consumes 75 kijoules of energy froma candy bar. if only 30 percent is lost as waste heat, how much energy can be used for actual work.?

B.) a 5000kg truck travels north in I-95 at a velocity of 108 kilometers per hour. whats the momentum at that velocity?

2007-02-25 08:53:15 · 4 answers · asked by Anonymous

Motion in 2-D question?
A small pane takes off at a constant velocity of 150 km/hour at an angle of 37 degrees. At 3.00 s a)how high is the plane above ground and b) what horizontal distance has the plane traveled from the liftoff point?

2007-02-25 08:43:16 · 2 answers · asked by Anonymous

Heat of fusion of ice from 3.55 KJ/kg to joules per mole
Density of ice from 0.917 g/ cm^3 turned to kg per m^3
Conductivity of ice from 2.00 w/ m/ K to m kg / s^3
4.5 cm to m

2007-02-25 08:42:22 · 2 answers · asked by nassafellow 2

2007-02-25 08:40:32 · 1 answers · asked by goring 6

A ball is thrown straight up into the air with an initial velocity, travels up, then comes back down into the person's hand. How does the velocity-time graph change: if the ball lands lower than the position it started from? if the ball lands above its starting point?

2007-02-25 08:15:28 · 2 answers · asked by Anonymous

2007-02-25 08:08:48 · 2 answers · asked by unknown 1

2007-02-25 08:03:07 · 8 answers · asked by Carmen S 1

and can you also tell me a simple way to find out the termanil velocity of things

2007-02-25 07:51:33 · 3 answers · asked by Anonymous

And how we are going to feel their presence if at all they are there?
Because, we have 'eyes', through that we are "seeing". Suppose, the astral-beings have some 'X', through that they are "Xing" means, how we ever could know or feel that feelings?
Not only that, if they too don't have the sense of 'eyes & seeing", how come they could communicate with us?
We human have five senses to percieve this world. For example we see things by external eyes, and it is being percieved by the inner-mind-eye! This seeing experience can never be explained or transferred to a man who is born-blind!! If it is the case with our-worldly-same-wave-length people, what is the case with other wordly people?If some one has some other senses than our normal 5 senses, how could we understand or feel "that particular sense" through our other senses? ( in this case shall we also be not a blind?) And, even if some other creatures do live in this cosmos contemporarily, HOW COULD WE FEEL THAT, BY WHICH SENSE?

2007-02-25 07:40:42 · 8 answers · asked by yozenbalki 2

2007-02-25 07:32:12 · 9 answers · asked by ucla06bruins 1

I have always been puzzled by this....assuming that two objects are being taken into consideration, and that both objects are moving in the opposite directions <-----> . How would one judge the velocity of each of the objects (again only considering these 2 objects). For instance, if both object's velocity where just under the speed of light...couldn't we consider one of the objects to be stopped (0 velocity) and the other to be moving well over the speed of light?

2007-02-25 07:27:29 · 6 answers · asked by ucla06bruins 1

Two pool balls of equal mass move toward each other. One travels at 1.5 m/s while the other travels at .5 m/s. If the collision is elastic, what are the velocities of each pool ball after the collision?
For the ball traveling at 1.5 m/s I got a final velocity of 0 m/s
The other ball I have traveling at 1 m/s
Is that right? thanks

2007-02-25 07:25:21 · 3 answers · asked by dqmiddleman 2

i wanna know why is the space dark???????
i want a scientific answer

2007-02-25 07:22:27 · 9 answers · asked by Anonymous

Two long straight parallel wires separated horizontally by 4.0 cm carry currents of equal magnitude but heading in opposite directions. The wires are perpendicular to the plane of this page. Point P is between the wires, 1.0 cm from wire 1 and 3.0 cm from wire 2, and the magnetic field at point P is 1.0 × 10-2 T directed downward. Calculate the current in wire 1 and its direction.

2007-02-25 07:13:34 · 1 answers · asked by David S 2

A 100 story steel frame building had a very intense fire on the 80th floor. That fire caused the complete and instantaneous collapse of the steel support on floors 79, 80, and 81. After those three floor collapsed, the weight of floors above caused the 78th floor to collapse, and then the 77th floor, and so on.

Ignore friction and the energy required to break the steel frame. Assume that the mass of each floor is the same. Please take into account the inertia of each floor.

How long does it take for the building to collapse?

How would friction, the pulverization of concrete, and the breaking of the steel frame affect the speed of the collapse?

2007-02-25 07:13:32 · 3 answers · asked by Skeptic 7

2007-02-25 07:11:12 · 11 answers · asked by 007 1

the physicists can't be popular, like Einstien. I'm not a science major and I'm really not into physics...so does anyone know of a not so popular physicist that would be interesting to research? They need to have enough information about themsleves for me to write a couple pages. Any suggestions?

2007-02-25 07:10:51 · 6 answers · asked by mysterious_qt 2

A current I = 58 A flows through a strip of metal of width 6.5 cm and thickness of 0.55 mm (the figure below ). An electromagnet is switched on so that there is a uniform magnetic field of magnitude 0.61 T directed into the page, and the Hall voltage is measured to be 3.4 µV. What is the density of carriers (number of carriers per unit volume) in the strip?

2007-02-25 07:10:05 · 1 answers · asked by David S 2

the earth revolves about its axis every 24 hours.find the magnitude
of the average acceleration of a point on the equator over 6-hour time interval.(the radius of the earth is 6.38*10^6M)

can someone explain it to me?

2007-02-25 06:56:38 · 1 answers · asked by Anonymous

A plane flies a square route, with each side 1500m in length (north, west, south, then east). If there is a wind blowing from the east at 20km/h during the whole trip, find the total time it will take the plane to complee the journey, given that the plane is flying at 80km/h.

The answer is about 280s.

2007-02-25 06:39:49 · 3 answers · asked by Anonymous

tell me more about the below in relation to the question;
1.maximum height
2..projectile motion

2007-02-25 06:28:27 · 1 answers · asked by Nim E 1

2007-02-25 06:17:53 · 16 answers · asked by love_fool 3

2007-02-25 06:17:38 · 1 answers · asked by Matthew H 1

2007-02-25 06:13:07 · 1 answers · asked by boss 1

2007-02-25 06:06:20 · 2 answers · asked by venky 1