Physics

I am having a lot of problem with electricity chapter ,, is there any site of physics

If you are a physics prof , please post your email address. thanks , :)-you can go to youtube and type the subjects name so you may get the absolute video,they will explain it pretty cool with lot of

A fisherman's scale stretches 4.2 cm when a 2.9 kg fish hangs from it.

A fishermans scale stretches 4.2 cm when a 2.9 kg fish hangs from it. (a) What is the spring stiffness constant?___________N/m (b) What will be the amplitude and frequency of vibration if the fish is

What is the purpose of hollow-point rounds

I gather from the name that theyre bullets with a hollow tip, but I cant figure out why that would be beneficial.-When shot, the bullet takes air resistance. The air pushes the hollow point on the bul

In need of Physics lab help!

Hey guys, i need help in deriving the fraction error equation using these formulas. In this experiment, the acceleration due to gravity is related to the time t it takes the ball to fall a distance y

If the flow of current remains intact in a circuit , then what are resistors for

Resistors have 2 basic uses. 1. To convert energy to heat/light (e.g. a light bulb is a sort of resistor) 2. To provide a required voltage; e.g in an electronic devices (TVs, computers, etc), resist

The physics of satellite motion around Jupiter.

The physics of satellite motion around Jupiter. A satellite is placed in orbit 6.00 x 105 m above the surface of Jupiter. Jupiter has a mass of 1.90 x 1027 kg and a radius of 7.14 x 107 m. a) Determi

If you increased the mass of an object how might it affect the speed

why? THANK YOU!-Objects of the same volume fall at the same rate. Elementary physics, Galileo *****!-Not enough information. This question cannot be answered without an explanation of how you are

What types of waves are earthquakes

I need to know what the most common type of wave is during earthquakes. I am talking about mechanical waves, as in longitudinal waves.Are longitudinal waves a type of wave that is sent through the ear

An incompressible ideal liquid...

I know the answer, but I keep coming up with 8gh/3... Please help! If you need to see the illustration: http://online.physics.uiuc.edu/cgi/courses/shell/phys101/spring11/prep2a.pl?practice/exam3/fa1

Can you find kinetic friction

A grindstone in the shape of a solid disk with diameter 0.520mand a mass of 50.0kgis rotating at 850rpm . You press an ax against the rim with a normal force of 160N(see the figure below), and the gri

Why is the equation E=MC^2 exactly squared

Why could it not be E=MC^1.9999,or E=MC^2.0001? Is it really exactly equal to speed of light squared?-The Derivation of E=mc2 Perhaps the most famous equation of all time is E = mc2. The equation is

Physics image height question

A photographic image of a building is 0.092 m high. The image was made with a lens with a focal length of 52.0 mm. If the lens was 100 m from the building when the photograph was made, determine the h

Quick physics question! help please!!

A 110-W arc lamp operates with an effiency of 6% for emitting light. it emits light of wavelength 585 nm. How many photons per second does it emit? a) 3.2 * 10^20 b) 3.2 * 10 ^9 c) 4.0 * 10 ^18 d

A wheel rolls 7 revolutions on a horizontal surface without slipping.

If the center of the wheel moves 3.3 , what is the radius of the wheel?-distance = 3.3 units circumference of the wheel * revolutions = distance 2*pi*r*7 = 3.3 r = 3.3/(7*2*pi) = 0.075 units

Difference between electric potential and electric potential energy

What is the difference between electric potential and electric potential energy, in plain english?-The electric potential is the potential energy which can be given to each and every coulomb of charge