two tiny spheres, A and B, or mass 5g each each carry equal positive charge 2.0uC. They are connected by a .5m long insulating string with negligible mass. only electric forces are relevant in this problem. A) what is the tension in the string B)what is the electric potential energy of the problem c) if the string is cut what is the speed of sphere A when the two are very far apart

A doughnut contains about 280 Calories. (Note: These are "food" Calories.) After eating this doughnut, you decide to compensate by taking the stairs instead of using the elevator. If each stair has a height of 18 cm, how many stairs must you climb to compensate for the doughnut? Assume all the energy in the doughnut can be converted to mechanical energy. (Take 75 kg as the mass of a typical person.)

from the book feynmans lost lecture by david goodstein what are the key steps in feynman's original derivation of kepler's first law from the law of universal gravitation, using only high-school algebra and trigonometry. draw some key diagrams to clarify the important steps.

Thank you for making the answers clear, so I can rate accordingly, as soon as I get a chance.

A toy plane with a mass of 1.01 kg is tied to a string and made to travel at a speed of 24 m/s in a horizontal circle with a16-m radius. The person holding the string pulls the plane in, increasing the tension in the string, increasing the speed of the plane and decreasing the radius of the plane's orbit. What is the net work done on the plane if the tension in the string increases by a factor of four and the radius decreases to 12 m.

two positive charge and two negative charges of magnitude (Q) at the corners of a square of length (L) such that the like charges are at diagonally opposite corners. determine the magnitude and direction of the force on one of the positive charges due to the other three charges

How do I fill the following table?

Use 3 significant figures and the accepted prefixes (kilo, mega, giga, tera, mili, micro, nano, etc.)

Two canoeists start paddling at the same time and head toward a small island in a lake, as shown in the figure (Figure 1) . Canoeist 1 paddles with a speed of 1.40m/s at an angle of 45 ? north of east. Canoeist 2 starts on the opposite shore of the lake, a distance of 1.5 km due east of canoeist 1.

a-

In what direction relative to north must canoeist 2 paddle to reach the island?

Express your answer using two significant figures.

b-

What speed must canoeist 2 have if the two canoes are to arrive at the island at the same time?

Express your answer using two significant figures.

A spherical raindrop 1.9 mm in diameter falls through a vertical distance of 5000 m. Take the cross-sectional area of a raindrop = ?r², drag coefficient = 0.45, density of water to be 1000 kg/m³, and density of air to be 1.2 kg/m³.

Calculate the speed a spherical raindrop would achieve falling from 5000 m in the absence of air drag.

What would its speed be at the end of 5000 m when there is air drag?

An object is 32cm in front of a convex mirror with a focal length of -19cm .Locate the image?

Is the image upright or inverted?

An object is 15cm in front of a concave mirror with a focal length of 22. Locate the image.cm.

Is the image upright or inverted?

One cylinder in the diesel engine of a truck has an initial volume of 600cm3 . Air is admitted to the cylinder at 25?C and a pressure of 1.0 atm. The piston rod then does 300J of work to rapidly compress the air.

Final temperature was calulated to be 610 degree celcius.

What is the final volume?

I wonder what were the main experiments that led people to develop the concept of wave function collapse? (I think I am correct in including the Born Rule within the general umbrella of the collapse paradigm.) Are there any instances where cases once thought to be examples of collapse have since been explained as the normal time-evolution of the wave function?

EDIT: I'm going to have to make an objection to Ron Maimon's very excellent answer about particle tracks as evidence of collapse. I've been waiting for someone to suggest what I personally have always considered the prototype of the wave function collapse, namely the appearance of flecks of silver on a photographic plate when exposed to the light of a distant star. This has the essential elements of collapse in a way that ordinary photographic exposures do not. The mere appearance of dots on a photographic plate does not signal the collapse of anything: it is readily explainable as a consequence of the rate of silver-bromide reduction being proportional to light intensity. It is only when the intensity becomes so very low that the time taken to accumulate enough energy for a single conversion becomes unreasonable that we must consider the explanation of wave function collapse.

The tracks in the cloud chamber do not demonstrate this phenomenon since the energy needed for the creation of the tracks is already available in the supersaturated gas. It is not necessary for the incoming particle to supply energy for the creation of the track, so there is no need to collapse its wave function. The straightness of the tracks is explained by Mott as an ordinary consequence of time-evolution of the wave function. There is no experimental proof that a single "particle" cannot be responsible for multiple tracks in the cloud chamber, because the tracks are not tagged according to which particle created them.

1. think about the modes of substances in the gas phase and explain why potential energy is included in the thermal energy of some substances in the gas phase, but not in other substances in the gas phase.

2. PE= E-bond + (1/2)E-thermal             and           KE = (1/2)Ethermal

when a monatomic solid/liquid turns into a gas, what are the PE and KE equal to then?

Derive/show the second order differential equation that describes the system and resonance.