A steel cable whose effective cross section is 1.20 cm2 supports a 200-kg elevator. When the elevator is at rest at the second floor the length of the supporting cable is 40.000 meters. What...

One sphere with a radius of 1cm and another sphere with a radius of 2 cm are distanced with 1m appart, and are tied with the source of the electromotive force ε=3000 V. With what force these spheres...

A GPS satellite orbits at an altitude of 2.06×104 km above the surface of Earth. (Recall that RE = 6.37 × 106 m.) What is the speed of the satellite?

1. How fast must an electron move if it is to have a de Broglie wavelength of 3.9 ✕ 10-11 m?   2.What is the speed of a proton with a de Broglie wavelength of 3.20 ✕ 10-14 m?

An electric force is formed by a charged particle q=1.5•10^(-9)C, (1.5 times 10 in the exponent -9).In what distance are placed two equalpotencial areas in vacuum, if their potentials are φ1=45...

bolt of lightning, such as the one shown on the left side of the figure below, behaves like a vertical wire conducting current. As a result, it produces a magnetic field whose strength varies with...

a piano tuner exerted 1500 N in stretching a 0.5 m long steel piano wire with a cross-sectional area of 0.15 cm^2. by how much does this force lengthen the wire?

A stroboscope is set to flash every 8.00 X 10-5 s. What is the frequency of the flashes?     Find the frequency of a tuning fork that takes 2.50 X 10-3s to complete one...