Physics - March 2007

would a reading above the normal 120/80 in Torr(or in 16/11 in kPa) indicate he is suffering from high blood pressure? Explain.

2007-03-12 21:20:18 · 7 answers · asked by sheloni 1

2007-03-12 21:17:15 · 5 answers · asked by stayin alive 2

I know temperature does effect the speed of dound in air but why and how?
=P
Thankyou =)

2007-03-12 21:10:25 · 4 answers · asked by Anonymous

explain why eating salty foods would increase the risk of heart attack to people suffer from high blood pressure

2007-03-12 21:01:13 · 2 answers · asked by sheloni 1

why are bed sores less likely to develop on the body of a hospital patient if the hospital provides the patient with a water bed rather than a regular bed?(hint: what does Pascal's principle indicate about the water in the water bed?)

2007-03-12 20:32:19 · 2 answers · asked by sheloni 1

after achieving top speed he runs the remainder of the race without speeding up or down. if total race is run 12 seconds how far does he run during the acceleration phase

2007-03-12 20:09:54 · 2 answers · asked by Anonymous

Hello experts and everyone!!
I wanna ask 3 questions that confused me alot
Please if anyone would answer my questions :)
Wish you all of best of the best best very best luck!!

1.) How do you think these molecules are arranged in solids? In liquids? In gases?

2.) What happens to their arrangement when a solid is heated and the melting point is reached?

3.) What happens to the arrangement at the boiling point?

2007-03-12 19:48:58 · 6 answers · asked by Anonymous

at the same time a man is running on the ground at a distance of 31m from building. what must be the average speed of the person if he is to catch the ball

2007-03-12 19:41:07 · 6 answers · asked by hope 1

1)A 10 Kg block is placed on a floor (co efficient of friction between the block and floor is 0.25). It is pulled horizontally by a force of 2 kg-wt. What is the frictional force acting at the interface?

2)Can you add 3 unit vectors to get a unit vector?

3)Two vectors 2p and p are inclined to each other at a certain angle. If the first vector be doubled, then the resultant vector is increased three times. Calculate the angle between the two vectors.

2007-03-12 19:38:00 · 3 answers · asked by NS 1

One deterrent to burglary is to leave your porch light on all the time. If your fixture contains a 60-W(watt) bulb at 120 V(volt), and your local power utility sells energy at 8 cents per kilowatt-hour, how much will it cost to leave the bulb on for the whole month?

2007-03-12 19:24:59 · 5 answers · asked by aznboi4et3nity 1

A block, mass 0.75 kg, is "shot" from a spring gun from a table. The table has a height 1.04 m and is frictionless. If the spring has k=28 N/m and is originally compressed 0.23 m, how fast will the block be goign when it hits the ground?


(1/2)*kx^2 = (1/2)mv^2 ?????????????



I got 4.3 m/s but the answer is 4.73 m/s

2007-03-12 19:06:11 · 1 answers · asked by bollocks 2

gun A is fired straight upward with pellet going up and then falling back down eventually hitting ground beneath the cliff. Gun B is fired downwards. in absence of air resistance how long after pellet B hits the ground does pellet A hit the ground?

2007-03-12 19:06:06 · 3 answers · asked by hope 1

I understand there is no absolute present and the age of the twin on earth has to be adjusted when the spacecraft does the turnaround.

But what I want to know is what does the twin in the spacecraft see when looking through the large telescope pointing at earth.

Does he see things in rapid fast forward? Like the earth suddenly heats up for the passage of time to be accounted for?

2007-03-12 19:05:09 · 3 answers · asked by Anonymous

2007-03-12 19:01:07 · 6 answers · asked by fshmaysani 1

an electron enters the lower left side of a set of parallel plates and exits at the upper right side. The intial speed is 7.0 * 10^6 m/s.
The plates are 21 cm long, and are separted by 10 cm.
so basically it starts here
and ends here
start
and the y distance is 10 cm. , while the x distnace is 21 cm. the top plate is postiviely charge,d while bottom plate is negatively charged.

2007-03-12 18:48:39 · 1 answers · asked by Jonathan J 1

a) What is the centripetal acceleration of the child?_____m/s

(b) What force (magnitude and direction) does the seat exert on the child at the lowest point of the ride? _____N

c)What force does the seat exert on the child at the highest point of the ride? magnitude ______N
direction_______

d) What force does the seat exert on the child when the child is halfway between the top and bottom?magnitude______N
direction_______

only need help on this on guys. keep getting the wrong answers, Thanks!

2007-03-12 18:43:53 · 1 answers · asked by cosmo 1

what really is 0 gravity?

2007-03-12 18:11:41 · 8 answers · asked by Anonymous

would you expect to get a more precise g for a longer or shorter pendulum?

why is it important to keep the angle of the string small?

2007-03-12 17:49:27 · 2 answers · asked by Anonymous

My physics class has an assignment to heat room temperature water without using any heaters or fire to raise the temperature.

2007-03-12 17:26:01 · 14 answers · asked by hawkeye2441 2

OK i think im looking for Efc(centriphical force) so i got this info.
MARS
mass: 641850000000000000000000
radius: 3.397000
distance from sun: 227936640 ... is this number equal to 2.2793664x10^11??

and the quesrion is asking me to find the force on a 1-kg object at the planets surface so i dont know if to use V2= G(m2)/r
or just use m(v2)/r

what do you ppl think??

2007-03-12 17:17:29 · 3 answers · asked by Rosa M 1

...that is, measuring 3 sides of a triangle in the lab.

2007-03-12 17:16:16 · 3 answers · asked by Anonymous

A circular coil with a radius 28 cm has 80 turns. An electromagnet produces a uniform magnetic field of strength 1.9 T that is perpendicular to the face of the coil. The current in the electromagnet is turned off, so that the magnetic field decreases to zero in 25 ms.
--------------------------------------------------------------------------------
What is the average emf induced in the coil during this time? (in volts)

2007-03-12 17:12:24 · 1 answers · asked by Jesse 3

2007-03-12 17:06:33 · 3 answers · asked by crazy kitter 1

So heat is the random movement of molecules, and infrared light is part of the electromagnetic field. So why do scientist always refer to heat as infrared as if it is one in the same thing. Also if heat is capable of generating infrared somehow, then why not other wavelengths?

2007-03-12 16:58:35 · 3 answers · asked by justin l 5

Two small spheres in vacuum carrying charges of +6.00 µC and -7.00 µC are 5.00 m apart, center-to-center. What is the magnitude of the electrostatic force each experiences?

_____

2007-03-12 16:54:15 · 1 answers · asked by Khoi 1

A mass spectrometer is used to examine the isotopes of uranium. Ions in the beam emerge from the velocity selector at a speed of 456,000 m/s and enter a uniform magnetic field of .498 T directed perpendicularly to the velocity of the ions. The charge of an electron is 1.602x10^-19 C and the atomic mass unit is 1.66x10^-27 kg. What is the distance between the impact points formed on the photographic plate by singly charged ions of 235-U and 238-U. **Answer in units of cm.
Thanks for your help.

2007-03-12 16:51:25 · 2 answers · asked by Anonymous

My fiance says it's G-Force but I say hell no. I know what the word is but I can't think of it. I think it starts with a C but I need some help here. I have 500 dollars riding on this.

2007-03-12 16:44:30 · 3 answers · asked by blueblondie06 1

The force of repulsion that two like charges exert on each other is 3.0 N. What will the force be if the distance between the charges is increased to 6 times its original value?

2007-03-12 16:41:11 · 1 answers · asked by Cameron 2

how do you calculate the speed of sound from the double slit diffraction experiment if you have plotted distance vs. intensity (v)
thank you!

2007-03-12 16:37:52 · 2 answers · asked by Anonymous

CD has mass of 17 grams and a radius of 6.0 cm. When inserted into a player, the CD starts from rest and accelerates to an angular velocity of 21 rad/s in 0.95 seconds.

2007-03-12 16:18:56 · 1 answers · asked by Akshar P 1