What power should they have
A person is to be fitted with bifocals. She can see clearly when the object is between 45 cm and 1.4 m from the eye. The upper portions of the bifocals should be designed to enable her to see distant objects clearly. what power should they have?
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Two people are talking at a distance of 3.0 m from where you are and you measure the sound intensity as 1.1×10-7 W/m2. Another student is 4.0 m away from the talkers. What sound intensity does the other student measure?
A proton is fixed in place. An electron is released from rest and allowed to collide with the proton. Then the roles of the proton and electron are interchanged, and the same experiment is repeated. Which is traveling faster when the collision occ
A cubical block of wood 10cm on a side, floats at the interface between oil and water with its lower surface 1.50 cm below the surface a) what is the gauge pressure at the upper surface of the block?
A string of 23 identical christmas tree lights are connected in a series of 120 V source. The string dissipates 73W. What power is dissipated in a single light?
A cable is used to raise a 28 urn from an underwater archeological site. There is a 25 drag force from the water as the urn is raised at a constant speed.What is the tension in the cable?
What temperature will equal number of atoms have electrons in the ground state and in the second excited state. The boltzman equation gives me a incorrect answer, how do you do this?
It compresses the spring, then is pushed back in the opposite direction by the spring, eventually losing contact with the spring. How long does the block remain in contact with the spring?
a train that is 80m long begins uniform acceleration from rest toward a railway worker who is standing 150m from the track. When the front of the train passes the worker, the trains speed is 20m/s. How fast is the last car moving when it passes th
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