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A perpetuum mobile (latin for "perpetuum motion machine") is an apparatus capable of doing work without supply of energy.
It has been the dream of invemtors since ancient times and continues to pop up in sketches and drawings of would-be inventors every now and then but in 1775the Royal Academy of Sciences in Paris issued the statement that the Academy " will no longer accept or deal with proposals concerning perpetual motions(Why).
Please look for information about perpetual motionmachines, select one and post a message describing it. Did it work?
The magnetic energy stored in a certain inductor is 2.50 × 10-2 Joule when the current is 6.00 × 10-2 Amp. Estimate what the inductance
Two masses are attracted by a gravitational force of 0.19 N. What will the force of attraction be if the distance between the two masses is doubled?
A 50 g ice cube floats in 200 g of water in a 100 g copper cup; all are at a temperature of 0°C. What is the mass of the lead
An airplane is flying with the velocity of 82.0 at an angle of 22.0 above the horizontal. When the plane is a distance 111 straight above a dog that is standing on level ground, a suitcase drops out of the luggage compartment. How far from the dog..
reneacute descartes is often called the father of modern philosophy. born into the french aristocracy in 1596
Scientists are constantly searching for new, viable, alternative forms of energy to power our cars and homes.
A point source of light is located at the bottom of a swimming pool 5 m deep. Find the area of the circle of light visible on the surface of the water
A 57 kg tightrope walker stands in the middle of a rope. Her weight makes the rope sag, evaluate the rope tension
(a) Calculate the classical momentum of a neutron traveling at 0.978c, neglecting relativistic effects. (Use 1.67 ? 10-27for the mass of the neutron.)
Red light of wavelength 633nm from a helium-neon laser passes through a slit 0.370mm wide. What is the width of the central bright fringe
A tennis player tosses a tennis ball straight up and catches it after 3.0 s. Find the initial velocity of the ball
question1at what distance from a proton is the magnitude of its electric field 2.3times105? what is magnitude of the
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