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An acrobat of mass 52 kg is going to hang by her teeth from a steel wire and she does not want the wire to stretch beyond its elastic limit. The elastic limit for the wire is 2.0 x 108 Pa. What is the minimum diameter (in mm) the wire should have to support her?
An accelerating voltage of 2.52 x 10^3 V is applied to an electron gun, What is the magnitude of the deflection on the screen caused by the Earth's gravitational field
A transformer has 683 turns in its primary winding and 109 in its secondary winding. Assuming it has 100 percent efficiency, By what factor does it change the current
The International space station (ISS) orbits the Earth at an altitude of 350km above the surface. it takes 90min to complete one orbit around the Earth. explain why the two clocks fall out of synchronization
A billiard ball is moving in the x-direction at 30 cm/s and strikes another billiard ball moving in the y-direction at 40.0 cm/s. As a result of the collision, the first ball moves at 50.0 cm/s, and the second ball stops. In what final direction d..
Two children, Omar and Melinda, ride on the same merry-go-round. Omar is a distance R from the axis of rotation; Melinda is a distance 2R from the axis. What is the ratio of Omar's angular speed to Melinda's angular speed? What is the ratio of Omar's..
A 50-kg satellite circles the earth in an orbit with a period of 120 min. What minimum energy is required to change the orbit to another circular orbit with a period of 180 min?
A diffraction grating with 610 lines per mm is illuminated with light of wavelength 520 nm. A very wide viewing screen is 2.1 m behind the grating. How many bright fringes can be seen on the screen
Suppose a disk is 0.50 cm thick and 4.0 cm in diameter. If this disk supports half the weight of a 90 kg person, by what fraction of its thickness does the disk compress
The inner and outer surfaces of a 5m x 6m brick wall of thickness 30 cm and thermal conductivity 0.69 W/(m x degree C) are maintained at temperatures of 20C and 5C. Determine the rate of heat transfer through the wall in W.
A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 96 kg. Find the speed of the wagon after the rock is thrown
Recent studies have raised concern about `heading' in youth soccer(i.e., hitting the ball with the head). A soccer player `heads' asize 3 ball deflecting it by 59.0°, and keeps its speed of11.60 m/s constant.
ball a is dropped from the top of a building of height h at the same instant that ball b is thrown vertically upward
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