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A spring is hanging from the ceiling of an elevator, and a 5.0-kg object is attached to the lower end. By how much does the spring stretch (relative to its unstrained length) when the elevator is accelerating upward at ?
Electric Field Mapping? A) In an experiment you will have carbon paper with silver electrodes painted on them. The paper acts like an insulator and the electrodes act like conductors. What should the field be inside the conductors? What about the pot..
Find out the gravitational potential energy of the child-Earth system relative to the child's lowest position at the following times.
A single 95mH inductor forms a complete circuit when connected to an ac voltage source at 240V and 60 Hz., What is the inductive reactance of the circuit
A long horizontal wire carries 28.0 Amp of current due north. Find what is the angle of the net magnetic field
You dip our finger into a pot of water twice each second, producing waves with crests that are separated by 0.15 meter. Find the frequency period and speed of these water waves
A horizontal 5-cm diameter water jet with a velocity of 18 m/s impinges normally upon a vertical plate of mass 1000 kg. The plate rides on a nearly frictionless track and is initially stationary. When the jet strikes the place, the plate begins to..
a heat engine has an efficiency of 65.0% and receives 150 J of heat per cycle. How much work does it perform in each cycle
A wire carrying 425 A to the motor of a commuter train feels an attractive force of 3.8 x 10-3 N/m due to a parallel wire carrying 5.4 A to a headlight. How far apart are the wires in meters
A cylindrical cable with 1.59 x 10-8 m resistivity carries a current of 1000A. There is a potential difference of 1.9 x 10-4 V between two points on the cable that are 0.32 m apart. What is the radius of the cable?
A small airplane flies with a speed relative to the ground (ground speed) of 219.0 km/h in a direction 20.0 degrees to the east of north. what is the speed of the wind
Luke and Leia are twins, and Luke immediately leaves after birth on a spaceship traveling at 65% of the speed of light, How old is Luke when he returns
A certain pipe has resonant frequencies of 350 Hz, 490 Hz, and 630 Hz, with no other resonant frequencies between these values. How long is this pipe
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