Physics - May 2007

true or false :
__ friction reduces the efficiency of a machine?
___an ax is an example of a wheel and axle.


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what happens to energy when work is done?

how are work, time, and power related?

name 6 types of simple machines and give examples of each.

2007-05-19 06:33:36 · 5 answers · asked by taylorakatata2007 1

Initially a small block of wood is at a point O on a rough plane inclined at15 degrees to the horizontal. The block is projected upwars with initial speed 4ms-1. The coefficient of riction between the block and the plane is 0.1. The block comes instantaneously to rest at A. Find the distance OA and the speed of the block as it passes through O on the way back down.

I have had some real trouble with this question. I know that you have to find the acceleration yet if the mass is not given how is this possible. Thanks a lot.

2007-05-19 06:14:25 · 1 answers · asked by Anonymous

2007-05-19 06:09:43 · 6 answers · asked by JT78 1

Because they're not in constant motion by the earth rotating aroung itself? (per Einstein)

2007-05-19 05:52:47 · 7 answers · asked by Travis Huynh 3

A. the acceleration finally reaches g.
B. the total force is zero
C. gravity no longer acts upon it
D. all of the upward forces add up to zero
E. the accerleration of gravity becomes 0

2007-05-19 05:46:01 · 9 answers · asked by izzymo 5

ok here is the situation, I have two 3000PSI pressure washer pumps, and a gas engine, If I took both and connected them to the motor, supplied enough water flow and used a coupler to join the output on both, will I get 6000psi of water pressure or will I end up creating back pressure and possibly damaging the pums, or will I get killed in the process.

I hope someone with an engeniering degree reads this, maybe I can get a valid answer. oh and forgive me for my spelling disaster here....he he he

2007-05-19 05:22:33 · 2 answers · asked by wehaulmove.com 1

2007-05-19 05:16:24 · 9 answers · asked by Lobster 4

i need a very gud definition .. not the normal one that it is the reflection of sound from some rigid surface

2007-05-19 05:10:56 · 13 answers · asked by akshita g 1

2007-05-19 04:32:03 · 5 answers · asked by Anonymous

Ok say a car rolled down a hill that was at an angle of 30 degrees and reached a final velocity of 40mps, the same car repeated this at 40 degrees and reached 49mps, what formula/ math functions, can be used to show the relation between the angle and the speed

2007-05-19 04:07:00 · 3 answers · asked by lllllll 2

Down the lowest level, a chemical reaction is just the way atoms bump into each other and the way they transfer energy and electrons. That's all we are. We are a bunch of chemical reactions. Yet somehow that has created thought. Somehow that has created cognitive free will and the ability to judge situations. I feel like more than a chemical reaction, or atoms just bumping into each other. Here's another question. If the laws of physics is correct, and if all anything that happens is atoms bumping into each other, than isnt everything set in place? Wasn't everything planned by what could only happen when the Big Bang went off?

2007-05-19 03:47:31 · 4 answers · asked by Anonymous

2007-05-19 03:42:54 · 5 answers · asked by marybeth 2

a force is applied to a block, causing it to accelerate along a horizontal, frictionless surface. the energy gained by the block is equal to the

impulse applied to the block
momentum given to the block
work done on the block
power applied to the block






which particle would generate the greatest amount of energy ifs it entire mass were converted into energy
electron
alpha particle
neutron
proton

2007-05-19 03:31:38 · 8 answers · asked by Anonymous

2007-05-19 03:06:23 · 14 answers · asked by i am the guy!! 1

2007-05-19 02:20:38 · 9 answers · asked by Matt 1

2007-05-19 01:38:57 · 7 answers · asked by Anonymous

are there any new discoveries with the use of projectile motion?

2007-05-19 01:07:51 · 3 answers · asked by kairrizordick 1

2007-05-19 00:26:32 · 3 answers · asked by Anonymous

2007-05-18 21:47:42 · 11 answers · asked by Jesus loves you 1

2007-05-18 21:16:16 · 5 answers · asked by jack 1

1} A body is dropped from a baloon which is moving upwards with aspeed of 10m/s.the body is drooed when the baloon is at height =390m from earth surface.find time for the body to reach the surface of the earth??
PLEASE GIVE ME A DETAILED ANS!!

2] what will area under dis-time graph give?

2007-05-18 20:54:37 · 5 answers · asked by genius 1

is it that tan# = 1/150 or that sin# =1/150

2007-05-18 20:32:15 · 4 answers · asked by kishore r 1

astronomy

2007-05-18 20:21:54 · 1 answers · asked by Anonymous

2007-05-18 19:15:42 · 19 answers · asked by Anonymous

I want to do some research on this but don't know the best method for microgravity simulation. need some help

2007-05-18 18:43:04 · 2 answers · asked by avery 1

2007-05-18 18:38:44 · 6 answers · asked by Alex P 1

2007-05-18 18:37:21 · 3 answers · asked by Alex P 1

And What Could Be The Reason

2007-05-18 18:25:20 · 2 answers · asked by Anonymous

ok theoretacally you can make anything that has hydrogen deuterated with heavy hydrogen. now the question is that for example alkaloids would they behave differenly in the body or would they be the same old thing just heavyer? or would they just last longer?

2007-05-18 17:43:34 · 2 answers · asked by Goldfish 2

a body is said to be charged when it looses or gain electron. When a body gains electron then it is said to be positively charged and when a body looses electron then it is said to be negatively charged, which implies that electrons are charge.
i want to know what charge really are? Are electrons charge?

2007-05-18 17:30:11 · 4 answers · asked by mind master 3