Physics - January 2007

A glass ornament of mass 575g sitting on a table is subjected to a resonant frequency of 440hz. The ornament breaks into three pieces that travel horizontally across the frictionless tabletop. Fragment A has a mass of 168g and fragment B has a mass of 212g. What is the magnitude of the momentum of the third piece of glass fragment c?

2007-01-28 17:51:42 · 3 answers · asked by Anonymous

Here's the entire question:
A +5.2 µC charge is placed at the origin and a -2.7 µC charge is placed at x = 25 cm. At what coordinates can a third charge be placed so that it experiences no net force?

Here's the hint my teacher gave us:
The point HAS to be along a line connecting the two charges. But it doesn't have to be BETWEEN them. Do this one like we did the force = zero on a third mass. But instead of x and r-x for distances, you use x and r+x if it is OUTSIDE.

I have been trying to do this problem for ages, but still can't get the right answer. Can someone help please? Thank you for your time.

2007-01-28 17:48:55 · 3 answers · asked by abc123 1

explain why and also explain a way to prove that EM radiation doesnt need a medium. It could just be an idea not something that you would do physically. Please answer this question as soon as humanly POSSIBLE!!!!!!!!!!!! onegia?

2007-01-28 17:41:26 · 5 answers · asked by Anonymous

The position of a 2.75 x 10^5 N training helicopter under test is given by r = (0.020 m/s^3)(t^3)i + (2.2 m/s)(t)j - (0.060 m/s^2)(t).

Find the net force on the helocopter at t = 5.0 sec.

Express the vector F in the form Fx, Fy, Fz.

2007-01-28 17:16:31 · 2 answers · asked by Amanda 2

When the very top of the domino hit something stationary, the momentum of the domino is the mass times the velocity of the top of the domino, or the momentum is the mass times the velocity of the centre of the mass?

2007-01-28 17:09:44 · 1 answers · asked by 3.141592653589793238462643383279 3

What is the magnitude of the orbital velocity, in , of the earth around the sun?What is the radial acceleration, in , of the earth toward the sun?

2007-01-28 16:40:09 · 2 answers · asked by Anonymous

A hot-air balloonist, rising vertically with a constant velocity of magnitude v= 5.00 m/s, releases a sandbag at an instant when the balloon is a height h= 40.0 m above the ground. After it is released, the sandbag is in free fall. For the questions that follow, take the origin of the coordinate system used for measuring displacements to be at the ground, and upward displacements to be positive.

A: Compute the position of the sandbag at a time 0.400 s after its release.
Take the free fall acceleration to be = 9.80 m/s^2.

B: Compute the velocity of the sandbag at a time 0.400 s after its release.

C: Compute the position of the sandbag at a time 1.35 s after its release.

D: Compute the velocity of the sandbag at a time 1.35 s after its release.

E: How many seconds after its release will the bag strike the ground?

F: With what magnitude of velocity does it strike?

G: What is the greatest height above the ground that the sandbag reaches?

please explain thanks

2007-01-28 16:38:54 · 3 answers · asked by Anonymous

... quadrupled. How far apart are they now?

Please help. Thanks.

2007-01-28 16:34:50 · 3 answers · asked by abc123 1

the unbalanced force that causes objects to move in a circular path is called centrifugal force or centripital force?

2007-01-28 16:26:49 · 2 answers · asked by that one girl from that one band 3

A physics student playing with an air hockey table (a frictionless surface) finds that if she gives the puck a velocity of 3.75 m/s along the length (1.78 m) of the table at one end, by the time it has reached the other end the puck has drifted a distance 2.48 cm to the right but still has a velocity component along the length of 3.7 m/s. She concludes correctly that the table is not level and correctly calculates its inclination from the above information.

What is the angle of inclination? (Take the free fall acceleration to be g = 9.80 m/s^2)

Thanks for the help.

2007-01-28 16:04:48 · 1 answers · asked by Amanda 2

Einstein called quantum entanglement "spooky action at a distance" Hawking tries to explain the nature of reality by experiments in which the outcome probably depends on the observer of the experiment. If the information paradox suggested by Hawking is indeed a paradox then it puts everthing back to spooky action at a distance .......... does it not? I could explain further about the relevance of the information paradox to quantum entanglement but then I would have to rephrase the question.

2007-01-28 16:04:26 · 10 answers · asked by captpcb216 2

its from a worksheet... thanks in advance ♥

the amount of air resistance acting on an object depends on the object's...
a) size and shape
b) mass and weight
c) density and mass
d) none of the above

2007-01-28 16:02:25 · 9 answers · asked by that one girl from that one band 3

Two runners start simultaneously from the same point on a circular track of length 185 m and run in the same direction. One runs at a constant speed of 5.50 m/s and the other at a constant speed of 6.50 m/s .

A: When will the fast one lap the slower one?

B: How far from the starting point will the slower one have run?

C: How far from the starting point will the fast one have run?

Thanks in advance guys :D

2007-01-28 15:44:06 · 3 answers · asked by Anonymous

2007-01-28 15:43:52 · 1 answers · asked by senovi a 1

2007-01-28 15:42:52 · 1 answers · asked by Anonymous

An object was measured with a metre stick. At one end the reading was (1.00+- 0.05) cm. and at the other ( 13.73 +- 0.02) cm. How long is this object?

2007-01-28 15:36:14 · 1 answers · asked by element69ca 1

Where do you hold an axe to generate the most force? Near the axe part, the middle or, at the end?

2007-01-28 15:34:20 · 12 answers · asked by Anonymous

Now calculate the range of a ball in yards hit at this launch angle with an initial speed of 90 miles per hour.

2007-01-28 15:06:38 · 5 answers · asked by RhondaJo 2

2007-01-28 15:05:44 · 8 answers · asked by naveed 1

If we were to play golf at a higher altitude, for exampleDenver,Colorado,the loca; acceleration due to gravity would be less.Explain both how and why this would affect our driving ranges?

2007-01-28 15:01:23 · 4 answers · asked by RhondaJo 2

Two charges q1 and q2 have a total charge of 9uC. When they are separated by 0.5m, the force exerted by one charge on the other has a magnitude of 8mN. Find q1 and q2 for each of the following situations.
a) both are positive so that they repel each other
b)one is positive and the other is negative so that they attract each other

2007-01-28 14:57:43 · 1 answers · asked by Dan L 1

2007-01-28 14:54:45 · 5 answers · asked by Anonymous

The acceleration of a motorcycle is given by a(t) =1.46 t - 0.114t^2 . The motorcycle is at rest at the origin at time t=0.

(Now, i found the velocity equation as a function of time as well as the position, but its asking me this:)

Calculate the maximum velocity it attains.

Thanks guys for this one in advance.

2007-01-28 14:54:20 · 2 answers · asked by Anonymous

Use the kinmatic equations to calculate the vertical hieght obtained by a golf ball in yards that is hit at this launch angle with an initial speed of 90 miles per hour.

2007-01-28 14:51:04 · 3 answers · asked by RhondaJo 2

2007-01-28 14:50:37 · 12 answers · asked by naveed 1

If we would play golf at a higher latitude,for example the north ploe,the local exceleration due to gravity would be greater.Explain both how and why this would affect our driving ranges.

2007-01-28 14:46:19 · 1 answers · asked by RhondaJo 2

1) Energy can change an object's speed, shape, direction, and ___.
2) Energy associated with an object's position and motion.
3) Energy of an object that can be potention in the "off" position and kinetic in the "on" position.

2007-01-28 14:33:13 · 1 answers · asked by Anonymous

I know that there is laws of physics. Such as, water boils when you reach x temperature and water freezes when you reach y temperature. BUT, do we know why water boils at a certain temperature and freezes at a certain temperature? Or not yet...??

2007-01-28 14:32:02 · 4 answers · asked by Anonymous

A golfer rides in a golf cart at a speed of 3.40 m/s for 35.0 s. She then gets out of the cart and starts walking at an average speed of 1.50 m/s. For how long (in seconds) must she walk if her average speed for the entire trip, riding and walking, is 2.60 m/s? (answer is in units of s)

2007-01-28 14:28:38 · 7 answers · asked by Lauren 1

2007-01-28 14:28:32 · 6 answers · asked by louiy 1