Physics - March 2007

A pendulum is released from rest at a displacement of .46 meters from its equilibrium position. It is stopped abruptly and uniformly at its equilibrium position and it is observed that a loose bit of metal slides without resistance off the pendulum and falls to the floor .86 meters below.
•If the projectile started off with a velocity in just its horizontal direction, and if travels .5 meters in the horizontal direction during its fall, what was the velocity of the pendulum at equilibrium?
•What is the period of motion of the pendulum?

2007-03-07 02:44:54 · 1 answers · asked by tan 1

Tension equation = m(a+g) I was doing a problem and someone said to leave g out because its frictionless, is this the only circumstance you would leave g out of a tension problem because I was trying to do the problem with g. The problem consisted of some box's on a surface being pulled by a rope.

2007-03-07 02:41:30 · 1 answers · asked by Anonymous

A cart of mass 1.2 kg coasts 75 cm down an incline at 8 degrees with horizontal. Assume that frictional and other nongravitational forces parallel to the incline are negligible.
•What is the component of the cart's weight parallel to the incline?
•How much work does this force do as the cart rolls down the incline?
•Using the definition of kinetic energy determine the velocity of the cart after coasting the 75 cm, assuming its initial velocity to be zero.
•Using the definition of kinetic energy determine the velocity of the cart after coasting the 75 cm, assuming its initial velocity to be .45 m/s.

2007-03-07 02:31:22 · 1 answers · asked by Astalav 1

2007-03-07 02:30:20 · 2 answers · asked by Chris O 1

-H-S---R (8 letters)

2007-03-07 02:23:11 · 7 answers · asked by Anonymous

Is it F(Normal) * friction? Is there any others?

2007-03-07 02:22:06 · 3 answers · asked by farxfromxlonelyx 1

What is the name of that desk toy that has metallic balls hitting each other continuously. In a pendulum motion. Trying to find it on the web, no idea what to call it

2007-03-07 02:19:53 · 4 answers · asked by Archangel 2

A disk of negligible mass and radius 30 cm is constrained to rotate on a frictionless axis about its center. The disk remains in a vertical plane with its axis horizontal. On the disk are mounted masses of 21 grams at a distance of 22.2 cm from the center, 10 grams data distance of 12.9 cm from the center and 41 grams at a distance of 11.4 cm from the center. A force is applied at the rim of the disk by a mass of 4.071 grams attached to by a light string around the rim.
•As the mass descends 53 cm, with the disk originally at rest, by how much does the potential energy of the system change?
•What therefore will be the angular velocity attained by the disk and the velocity attained by the descending mass?

2007-03-07 02:16:32 · 2 answers · asked by Astalav 1

current of unknown magnitude is sent through both wires. The wires are 26.5cm long and have a center-to-center separation of 0.0525cm. Find the current.

2007-03-07 02:16:03 · 1 answers · asked by rkh 1

2007-03-07 02:01:54 · 4 answers · asked by bansalpk03 1

2007-03-07 01:44:07 · 6 answers · asked by Anonymous

2007-03-07 01:41:14 · 8 answers · asked by MICHAEL J 1

I know it has something to do with the speed of light, curved space, weird physics stuff like that, but I'm not entirely sure what it all means. I'm not looking for a lot of detail in the answers, by the way...I know next to nothing about physics.

2007-03-07 01:09:00 · 8 answers · asked by Mr. Saturday 3

2007-03-07 01:08:47 · 6 answers · asked by mohan 1

100 hundred litres of oil would last for how long in a three bedroom house used 4 hours a day just for heating

2007-03-07 01:00:11 · 2 answers · asked by parkstreeter 1

2007-03-07 00:50:28 · 11 answers · asked by ConfusedQ 1

2007-03-07 00:25:48 · 9 answers · asked by veral s 1

2007-03-07 00:25:30 · 8 answers · asked by veral s 1

is time constant varies from capacitors to capacitors =] thx

2007-03-07 00:18:53 · 1 answers · asked by Tommy 1

It has been reported that a normal maximum perspiration rate is about 1.5 liters/hour, but that after 4 to 6 weeks of acclimatization in a tropical climate, it can reach 3.0 liters/hr. What maximum cooling power does this represent?

2007-03-07 00:04:43 · 4 answers · asked by Anonymous

if we are given 2 charges Q and -Q,
equipotential lines are symmetrical above the mid-point between -Q and Q, anybody can explain it plz =]

2007-03-06 23:52:02 · 2 answers · asked by Tommy 1

On many dried bean packets, the instructions are something like:
soak for 8 hours
boil vigourously for 10 minutes
simmer for 30 minutes

Why the boil vigourously for 10 minutes? The water is the same temperature as if you were to simmer it instead

2007-03-06 23:24:24 · 3 answers · asked by amania_r 7

2007-03-06 23:16:25 · 12 answers · asked by bennyrude 2

A person of age 19 years comes in contact with an a.c. supply of 120 volts. How many seconds will he take to die? Give an exact answer. Explain your answer in detail.

What else can happen to him? Under what circumstances can something else happen to him?

Please give a detailed answer. Don't think someone is really going to touch electric current. This is just a question. The most informative answer will get 10 points.

2007-03-06 23:01:23 · 3 answers · asked by Anonymous

2007-03-06 22:52:12 · 7 answers · asked by neologycycles 3

can a spcae shttule gilde from the end of the atmosphere to land, i.e from the moment it has entered atmosphere?

2007-03-06 22:50:27 · 2 answers · asked by Anonymous

I know a body in space seems to have no gravity, but still inertia on a given space being exelled is still present. with that in mind we will never get past 92 percent of the speed of light.So forget about warp drives and worm holes. The holly grail is going to be given to the man or woman who creates a field that shields gravitons in this field from attraction from the surounding enviroment.. The russians and others have been able to observe a reduction in effect on this field by superspining spuperconductors the experiment was able to shield the magnet from a fraction of graviton force. The earth spins at its core with molten metal, hot metal moving fast produces a field, maybe as an experiment we should try moving super hot murcury plasma at 1000s of rmps in space this could produce a more efficient reduction in shielding it and our gravitons, we may be able to gain time dialation by breaking a few rules.

2007-03-06 22:45:42 · 2 answers · asked by chingow 2

A batter of mass 100kg uses a bat of mass 2.0kg to hit a 140g ball. If the impact time is 0.01s and the ball reaches a speed of 60km/h from rest, what was the average force applied to the ball?

2007-03-06 22:44:34 · 2 answers · asked by Anonymous

2007-03-06 22:31:29 · 6 answers · asked by Anonymous

plz gimme some examples

2007-03-06 22:17:52 · 7 answers · asked by Anonymous