Physics - June 2007

2007-06-14 17:44:23 · 10 answers · asked by karan 1

The height h in feet of an object after t seconds is given by the function h=-16t^2+60t+9 How long will it take the object to hit the ground? Round your answer to the nearest thousandth.

2007-06-14 17:39:23 · 6 answers · asked by Jamie 2

the second image down on the right..quoting it says (Subatomic structures are visible within single tungsten atoms) so is this neutrons & protons??..heres the link....>>
http://www.physik.uni-augsburg.de/exp6/index/index_e.shtml

2007-06-14 17:27:19 · 2 answers · asked by Anonymous

Physics...anyone?

2007-06-14 17:10:07 · 3 answers · asked by wilboo_bitty924 1

2007-06-14 16:43:36 · 4 answers · asked by karan 1

2007-06-14 16:39:57 · 8 answers · asked by Anonymous

2007-06-14 16:36:51 · 5 answers · asked by Anonymous

2007-06-14 16:29:29 · 17 answers · asked by Anonymous

2007-06-14 16:27:37 · 3 answers · asked by Anonymous

2007-06-14 16:11:32 · 3 answers · asked by physicsmom 1

2007-06-14 15:58:07 · 14 answers · asked by jaabair2003 1

How do you calculate your buoyancy in sea water if you weigh 40kgs and the density of sea water is 1020kg

2007-06-14 15:52:06 · 3 answers · asked by Anonymous

Suppose a stone is thrown at an angle of 30.0 degrees below the horizontal. If it strikes the ground 57.0 m away, find (a) the time of flight. (b) the initial speed, (c) the speed and the angle of the velocity vector with respect to the horizontal at impact.

I know the answers are: (a) 1.57s, (b) 41.9m/s, (c) 51.3m/s, -45.0 degrees.

I just don't know how to start the problem b/c of the fact that the stone was thrown below the horizontal.

2007-06-14 15:43:45 · 3 answers · asked by Anonymous

(in physics terms) Is mechanical work done when the weightlifter lowers the bar to the floor or just when he lifts it?

2007-06-14 15:42:04 · 9 answers · asked by Melissa G 2

given: spools 1 (left) & 2 (right) are free to rotate about their centers A & B; constant spool radii: r1 & r2; cassette tape of constant thickness e and constant total length S is wound around spool 1; end of tape from spool 1 is pulled & attached to spool 2; tape leaves spool1 tangent at pt. of departure C above A, making angle gamma from the vertical; tape meets spool2 tangent at pt. of entry D above B, making angle delta from vertical; tape around spool 1 makes total radius R from A to C; distance d (bet. A&B) > R+r2; spool2 unwinds spool1 w/ constant clockwise angular velocity omega2; define angle phi as angle between CD and horizontal w/ vertex at D;
Find: angular velocity vector omega1(t) at any time t, angular acceleration vector alpha1(t), velocity vector v(t) and a(t) at C, phi(t), velocity vector d[phi(t)]/dt, acceleration vector d^{2[phi(t)]/dt2, R(t).
pls. show solution, assumptions, conventions, differential equations or matrix solutions}

2007-06-14 15:35:18 · 1 answers · asked by Anonymous

a larger one?

in my house with 3 box fans sucking out... if we have one window open my roomate says it will cool off faster than having a more than one open...

2007-06-14 15:32:51 · 5 answers · asked by dirtybreaks 1

2007-06-14 15:16:07 · 5 answers · asked by raquel 1

If there's any links out there it would be awesome if you put them here

2007-06-14 14:31:55 · 5 answers · asked by Jerse 3

why a visible condensation forms when a can of soda is opened?

2007-06-14 14:06:23 · 1 answers · asked by poovarasi l 2

2007-06-14 14:02:17 · 3 answers · asked by Anonymous

When the driver of mass 80 kg, steps into the car of mass 920 kg, the vertical height of the car above the road decreases by 2.0 cm. If the car is driven over a series of equally spaced humps, the amplitude of the vibration becomes much larger at one particular speed.
(i) Explain why this occurs.
(ii) Calculate the separation of the humps if it occurs at a speed of 15 ms-1.

2007-06-14 14:00:26 · 1 answers · asked by poovarasi l 2

physics- kinematics

2007-06-14 13:59:28 · 2 answers · asked by u_p_y 1

I know that energy can be defined as "the ability to do work," but it doesn't make sense to me that light and heat are the "ability to do work."

2007-06-14 13:58:03 · 7 answers · asked by Anonymous

2007-06-14 13:54:59 · 5 answers · asked by Mick D 1

Starting from rest, a 5.4 kg block slides 2.8 m down a rough 30.0° incline. The coefficient of kinetic friction between the block and the incline is µk = 0.436.

*the work done by the force of gravity is 74.1636J
*the work done by normal force is 0J

Can you help me determine the work done by the friction force between block and incline?

2007-06-14 13:44:53 · 2 answers · asked by Katie 1

the equation for it

2007-06-14 13:44:01 · 6 answers · asked by marthy 1

2007-06-14 13:38:24 · 12 answers · asked by Anonymous

2007-06-14 13:32:03 · 3 answers · asked by Connie 1

I can understand why Pangea broke up, because it was allowing the land to go to a lower energy state.
But why when Earth formed, was there one giant island on one side and water on the opposite side?
I was thinking that the formation of the moon must have happened not long after the Earth, so that the moons gravitation pull would cause land to bulge on the side closest to earth. But that means at that time, the Earths rotation must have been equal to the moons revolution, which is very possible since the moon is gradually moving away from us, hence changing its period of revolution.

Any Legitimate reasons are greatly appreciated.

And another thing. Is it just a coincidence that the Moons period of rotation is equivalent to its period of revolution?

2007-06-14 13:29:50 · 3 answers · asked by kennyk 4

2007-06-14 13:19:53 · 3 answers · asked by Joe 1