Physics - September 2007

A point on rotating turntable 21.5 cm from the center accelerates from rest to a final speed of .640 m/s in 1.70s. At t=1.28 s, find the magnitude and direction of each of the following:
(a) the radial acceleration
(b) the tangential acceleration

I'm not sure how to figure out the radial acceleration since this in not uniform circular motion. Thanks!

2007-09-18 06:26:58 · 3 answers · asked by Anonymous

2007-09-18 06:14:26 · 3 answers · asked by Anonymous

well, I'm sure the formula for finding the gravitational force is correct, if the radius is 0 the weight would ofcourse be undefined, then why is it 0 in all sources which I've read???

2007-09-18 06:04:46 · 2 answers · asked by Ice S 2

A set of crash tests consists of running a test car moving at a speed of 12.2 m/s (26.84 m/h) into a solid wall. Strapped securely in an advanced seat belt system, a 73 kg (160.6 lbs) dummy is found to move a distance of 0.69 m from the moment the car touches the wall to the time the car is stopped. Calculate the size of the average force which acts on the dummy during that time.

2007-09-18 05:51:27 · 2 answers · asked by Anonymous

A chain consisting of five links, each of mass 0.125 kg, is lifted vertically with a constant acceleration of a = 2.2 m/s2. Find the magnitude of the force that link 3 exerts on link 2.

I know the formula is F= M A

so F= 2.2 * 0.125 but what does it matter what link it is in the chain? and whats the magnitude?

2007-09-18 05:43:52 · 2 answers · asked by Anonymous

A particle of charge +13.2 µC and mass 7.64 x 10^-5 kg is released from rest in a region where there is a constant electric field of +397 N/C. What is the displacement of the particle after a time of 3.14 x 10^-2 s?

Please explain the solution, thanks!

2007-09-18 05:40:32 · 4 answers · asked by free f 1

Two charges, -13 and +4.8 µC, are fixed in place and separated by 2.3 m. (a) At what spot along a line through the charges is the net electric field zero? Give the distance of the spot to the positive charge in meters (m). (Hint: The spot does not necessarily lie between the two charges.) (b) What would be the force on a charge of +14 µC placed at this spot?

2007-09-18 05:38:16 · 2 answers · asked by free f 1

A ship sets out to sail to a point 210 km due north. An unexpected storm blows the ship to a point 110 km due east of its starting point. In what direction must it now sail to reach its original destination? ____________º (counterclockwise from east)

2007-09-18 05:23:46 · 2 answers · asked by sydkannon 1

i know one side of the triangle is 84.05

2007-09-18 05:05:40 · 3 answers · asked by mike d 1

2007-09-18 05:03:48 · 9 answers · asked by JAMES 4

Two football players start 37m apart. One football player goes from rest (0m/s) and accelerates at 5m/s^2 towards the other player. The other player maintains a constant velocity of 3.1m/s towards the first player.

How long will it take for both players to meet each other and how far will have each player travelled?

Please explain in detail and show the steps.

2007-09-18 04:57:58 · 1 answers · asked by khoa n 1

wat is root mean square velocity explain it

2007-09-18 04:34:58 · 3 answers · asked by karthikeyan v 2

A tractor sits on a bridge supported by two posts A and B. THe back wheel exerts a force of 14.000N and the front 6,000N. Calculate the force on each support.

distance from A to back= 5m
distance from BAck to Front= 3m
Distance between A and B= 15m

2007-09-18 04:32:42 · 1 answers · asked by Anonymous

how could we go about doing this and providing it for free?

2007-09-18 04:05:49 · 4 answers · asked by Anonymous

would it really be that astronomical? couldn't people be retrained and keep their jobs??? wouldn't this be better for the enviornment AND the economy, and SAVE money buy not building new plants?

2007-09-18 04:02:30 · 10 answers · asked by Anonymous

A thick insulating cylindrical shell with inner radius a, and outer radius b has
charge distributed throughout its volume with a uniform charge density ρ. Find the
electric field in three regions, (a) rb. (Ignore the ends of the
cylinder)

2007-09-18 03:57:50 · 1 answers · asked by Anonymous

and is a bbq one of them?

2007-09-18 03:36:32 · 6 answers · asked by Leah B 2

what will happen to the earth's angular velocity if all the ice from the polar caps are to be transported to equitorial regions to dampen deserts?

2007-09-18 03:23:49 · 3 answers · asked by Anonymous

Is it voltage or current? Or is it something else? Could you further explain? Thanks

2007-09-18 03:18:51 · 4 answers · asked by coolesteugene 2

The above question is related to electrostatic

2007-09-18 02:36:51 · 7 answers · asked by vivash 1

A juggler throws a ball from height of 0.950 m with a vertical velocity of +4.25 m/s and misses it on the way down. What is its velocity when it hits the ground? Show work.

2007-09-18 02:35:48 · 2 answers · asked by Josh S 2

Yesterday I saw not one but two rainbows in the sky. They did not overlap but they seemed to be close.if you know about Venn diagrams, i would say they were like an intersecting set but they did not intersect.To an artist, they may have seemed like a clone or shadow as one was foremost and distinct; the other was in the background. is this just a natural display or is it significant?

2007-09-18 02:02:16 · 4 answers · asked by Aoiffe337 3

Like skipping a stone, except with a bullet. On glass. What angle would you have to shoot it at so that it wouldn't break the glass?

2007-09-18 01:46:52 · 4 answers · asked by mash4t 2

An object of mass 1.7 kg starts from rest and slides down an inclined plane 80 cm long in 0.51 s. What net force is acting on the mass along the incline?

2007-09-18 00:42:43 · 2 answers · asked by mmcnb1987 1

a gyroscope consists of a metal disc of moment of inertia
I = 4.5 x 10^-5 kg m^2, mounted on a light axle of radius 2 mm
which rotates freely within a frame

I set the gyroscope in motion by pulling a 30 cm length of string, which I wound around the axle. I now apply a force of
10 N (in a direction perpendicular to the axle) to the string as it unwinds. Friction / air resistance negligible.

1. Calculate final angular speed & magnitude of angular momentum of the gyroscope

2. How long would it take me to pull out the 30 cm of string.

I calculated the work done ( 3 Nm) and torque (0.02 Nm)

2007-09-18 00:16:58 · 1 answers · asked by   4

Let the elevator have a mass of 1700 kg and an upward acceleration of 2.5 m/s2. Find T.

If the formula is T=ma then multiplying 1700 with 2.5 should give me the value for T but for some reason I'm not getting the right answer. Is it supposed to be 4250 or am I missing something? Thanks!

2007-09-18 00:15:59 · 6 answers · asked by me 1

2007-09-17 23:43:20 · 18 answers · asked by Rahul 1

2007-09-17 23:41:18 · 7 answers · asked by Rahul 1

The muzzle velocity of an armor-piercing round fired from an M1A1 tank is 1770 m/s (nearly 4000 mph or mach 5.2). A tank is at the top of a cliff and fires a shell horizontally. If the shell lands 6520 m (horizontally away) from the base of the cliff, how high is the cliff? Show work.

2007-09-17 22:37:35 · 4 answers · asked by Josh S 2

Okay, i've been trying to solve this equation for an hour already.. And my answer is different from others.. I don't know which is the right one.. So maybe you guys can help? Please?:)

V1 = 20 m; 10° East of North
V2 = 30 m; 10° South of East
_______________________
Vr = ????

2007-09-17 20:48:06 · 3 answers · asked by mariaastrud 1