Physics - September 2006

Over the weekend I went on a saltwater fishing trip,and had a thought or two,but couldn't figure it all out.
Here's the thought: If I could get the fishing line with the heavy sinker to stop just before it hit bottom,I wouldn't have to wait for all the silt that washed up from it hitting bottom to clear up.How long would it take for a 10oz sinker to free-fall through 250feet of water(assuming no drag).
The physics formula for calculating air drop would be ...
D = ((1/2 AT^)V1T))
where D is distance
A is acceleration
T is time
V is Velocity
I remember A being 10meters/sec.,but that is for air test as it is acceleration to the ground.
250ft is just under 77 meters

2006-09-26 18:07:44 · 2 answers · asked by frith25 4

2006-09-26 17:46:33 · 13 answers · asked by annie 2

2006-09-26 17:02:18 · 6 answers · asked by sunil n 2

A wedge of mass m = 35.5 kg is located on a plane that is inclined by an angle θ = 21.7 with respect to the horizontal. A force F = 349.3 N in horizontal direction pushes on the wedge, as shown. The coefficient of friction between the wedge and the plane is 0.143.

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.

I've tried so many different approaches, and I just can't get it... Please help, and try to explain how you got it, if possible. Because I'm lost. Thanks!

2006-09-26 16:49:02 · 3 answers · asked by Cando 3

If you drive 65km east and then turn around and go 45km west, what is your total displacement? Would it be 110km or just 20km?

2006-09-26 16:26:23 · 8 answers · asked by Caravan M 1

satelites in a circular, low Earth-orbit move at 8 km/s. Convert this speed to miles per hour. ( there are about 1.6 km in 1 mile and 3600 s in 1 hour)



thank you

2006-09-26 16:20:24 · 15 answers · asked by ♥ 3

2006-09-26 15:32:11 · 3 answers · asked by Anonymous

2006-09-26 15:19:49 · 6 answers · asked by Anonymous

two masses, m1 and m2, connected by a massless string, are accelerated uniformly on a frictionless surface. What is the ration of the tensions T1/T2.
I get an answer of m1/(m1+m2), but i am not sure if this is correct. Can you show me why this is correct?

Two masses, m1=12 kg and m2=35kg, are held connected by a massless rope hung over a frictionless light pulley. If the masses are released, what is the magnitude of the tension in the string.
My instructor says that the answer is 175N, but i don't get this answer. I get 225N. Why is this wrong. What i am doing is subtracting 12 from 35 and multpilying by 9.8. What is wrong with this?

Three blocks are connected by massless cords and rest on a frictionless horizontal surface. The blocks are pulled to the right. Mass m1=2, m2=3m3, with m1 on the left, and m3 on the right. IF the pulling force is equal to 90N, what is the tension in the cord between m1 and m2.

Why is the answer 49N?

2006-09-26 14:46:44 · 2 answers · asked by Anonymous

Acceleration = final velocity – initial velocity / elapsed time between two measurements

So: 91.5 – 0 / ????

What times do I subtract?

Data table for ball rolling down 10 degree incline lab:
Distance Time
91.50 1.16
76.25 1.12
61.00 .99
45.75 .83
30.50 .72
15.25 .53

I know velocity is d/t. Which numbers do I plug in where, to find acceleration? I tried and the numbers I got don’t match the scale for the graph at all. *See previous questions for more.
I don't know what to plug in where.
The lab was an inclined plane at 10 degrees with six sections marked off. We rolled the ball from each section until the end, timing it (from 15.25 cm, to the end, 0). Help...

2006-09-26 14:21:13 · 4 answers · asked by vintagex50s 2

2006-09-26 14:12:03 · 6 answers · asked by Anonymous

If the speed of light is equal to "c" and you are traveling in the same direction as the beam of light at speed "x" then shouldn't the speed of light you're observing be equal to "c-x"? I know it's not and that "c" is constant regardles of the speed of the observer but why?

2006-09-26 14:06:45 · 5 answers · asked by rubenff2000 1

If a current of one or two-tenths of an ampere were to flow into one of your hands and out the other, you would most likely be electrocuted right? But, if the same current were to flow into your hand and out the elbow above the same hand, you could survive, even though the current might be large enough to burn your flesh. Why is this??

2006-09-26 13:51:30 · 5 answers · asked by MegN 1

Which would do LESS damage...plugging a 110-V appliance into a 220-V circuit or plugging a 220-V appliance into a 110-V circuit?

2006-09-26 13:46:24 · 7 answers · asked by MegN 1

2006-09-26 13:27:40 · 9 answers · asked by Anonymous

If electrons were positive and protons were negative, would Coulomb's law be written the same or differently?

2006-09-26 13:22:24 · 12 answers · asked by MegN 1

When you rub one material against another, eletrons jump readily from one to the other right? So why don't protons do the same? (in atomic terms)

2006-09-26 13:20:05 · 5 answers · asked by MegN 1

2006-09-26 13:15:09 · 1 answers · asked by Rena Sweet 2

2006-09-26 13:07:47 · 4 answers · asked by Rena Sweet 2

2006-09-26 12:56:31 · 14 answers · asked by ♪ ♫ ☮ NYbron ☮ ♪ ♫ 6

With respect to forces, how are electric charge and mass alike? How are they different?

Does it have to do with Coulomb's Law? Or am I way out of the ballpark?

2006-09-26 12:56:23 · 3 answers · asked by MegN 1

police investigators, examining the scene of an accident involving two cars, measures 72m long skid marks of one of the cars, which nearly came to a stop before colliding. the coeeficient of kinetic friction between rubber and the pavement=.80. estimate the initial speed of that car assuming a level road.

2006-09-26 12:55:40 · 1 answers · asked by Anonymous

2006-09-26 12:42:24 · 5 answers · asked by yeday 2

I woke up and the only thing touching my bed was my head. My feet, legs and body were in the air about 2 feet. When I woke up, I crashed to the bed. Do you think this has the potiential to become a serious problem? I mean I would hate to wake up over the stairs or something one night. Should I tie a rope around one of my legs and anchor myself to the bed? Or is this a one time thing?

2006-09-26 12:16:39 · 9 answers · asked by DallasGuy 3

2006-09-26 12:04:21 · 9 answers · asked by S S 1

2006-09-26 11:20:47 · 12 answers · asked by Anonymous

2006-09-26 11:19:19 · 13 answers · asked by hayzman22 1

If a wave vibrates up and down twice each second and travels a distance of 20m each second. What is its frequency? What is its wave speed? Please give details. Thanks

2006-09-26 11:05:24 · 2 answers · asked by hayzman22 1

2006-09-26 10:31:46 · 4 answers · asked by hayzman22 1

What causes the normal force in physics?

2006-09-26 09:51:30 · 9 answers · asked by Anonymous