
An AC power generator produces 52 A (rms) at 3600 V. The voltage is stepped up to 100,000 V by an ideal transformer, and the energy is transmitted through a longdistance power line that has a resistance of 100 . What percentage of the power delivered by the generator is dissipated as heat in the...

Eighteengauge wire has a diameter of 1.024 mm. Calculate the resistance of 17 m of 18 gauge platinum wire at 20 C.

A small rectangular loop of wire is located close to a long straight wire initially carrying a current I = 114 A (see figure below). Find the average emf induced in the loop if the current in the wire reverses direction in a time interval of 1 131 s. magnitude 1 direction 2 Select...

One of the harmonics of a column of air open at one end and closed at the other has a frequency of 448 Hz and the next higher harmonic has a frequency of 576 Hz. How long is the air column ?

physics question : bow string held by 200n of force bisected in the middle by the arrow. Dividing the string into T1 & T2, what do I do to explian the scale used to determine the tension and show my work ?

A string is wrapped around a disk of mass m = 2.2 kg and radius R = 0.12 m. Starting from rest, you pull the string with a constant force F = 6 N along a nearly frictionless surface. At the instant when the center of the disk has moved a distance x = 0.13 m, a length d = 0.34 m of string has...

A photon is released from a hydrogen atom when an electron moves from a higher energy level to a level with lower energy. At what level does an electron begin its journey to the level n=1 if the emitted photon has a wavelength of 1.22 X 107m?

Suppose you are 70 cm from a plane mirror. What area of the mirror is used to reflect the rays entering one eye from a point on the tip of your nose if your pupil diameter is 5.7 mm?

two identical piano wires have a fundamental frepuency of 600Hz when kept under the same tesion. What fractional increase in the tension of one wire lead to the occurrence of 6 beats/s when both wires oscillate simultaneously?

Your swimming pool is square and 3.3 m on a side. It is 3.4 m deep in the morning. If the temperature changes by 42 C during the afternoon, how much does the depth of the water increase?
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Sample Questions
 The Earth’s rate of rotation is constantly decreasing, causing the day to increase in duration. In the year 2000 the Earth takes about 0.548 s longer to complete 365 revolutions than it did in the year 1900.
 (a) What is the average angular acceleration of the Earth?
 (b) If this average acceleration remains constant, in what year will the Earths rotation come to rest?
1. Can you show me step by step how to solve this problem?:
 A spherical balloon is made from a material whose mass is 3.00kg. The thickness of the material is negligible compared to the 1.5m radius of the balloon. The balloon is filled with helium (He) at a temperature of 305degrees K and just floats in the air, neither rising nor falling. The density of the surrounding air is 1.19kg/m^3. Find the absolute pressure of the helium gas
2. I do not understand this Ideal Gas Law and Kinetic Theory question. Can you help me set it up?