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Problem: Without corrective lenses a near sighted person can see clearly only objects that are within 100 cm from his eyes. The person has normal vision when wearing contacts.
Part A- What type of lens is the contact lens?
Part B- What is their focal length?
Please show how you get the answer.
The magnetic force per meter on a wire is measured to be only 27 percent of its maximum possible value. Find the angle between the wire and the magnetic field
The alarm at a fire station rings and a 79-kg fireman, starting from rest, slides down a pole to the floor below (a distance of 4.3 m). Just before landing, his speed is 1.2 m/s. What is the magnitude of the kinetic frictional force exerted on the fi..
What is the ratio of the amplitude of the damped oscillation
The potential energy stored in the compressedspring of a dart gun, with a spring constant of 66.50 N/m, is 1.040J. Find by how much is the spring is compressed.
A hoop and a disk, both of 0.44- m radius and 5.0- kg mass, are released from the top of an inclined plane 3.5 m high and 8.7 m long. What is the speed of the hoop
A particle is traveling in a straight line at a constant speedof 25.0 m/s. Suddenly, a constant force of 15.0 N acts on it, bringing it to a stop in a distance of 62.5 m. (a) What is the direction of the force? (b) Determine the time it takes for ..
Betelgeuse has a radius R= 500R(sun) and a surface temperature of T= 2500 K and has an apparent magnitude of m=0.5. How far away is Betelgeuse in parsecs
Bill measures the rate at which the clock in Sam's spaceship runs and finds that it is one-third the rate at which the same clock runs when it is at rest
A brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 N on him. What force does the winning player exert on the ground
A freshly prepared sample of a certain radio isotope has a duty cycle of 11.6 mCi. After 3.6 hours, its activity is 8.00 mCi. Find the decay constant per second
A phonograph record has an initial angular speed of 36 rev/min. therecord slows to 13 rev/min in 2 seconds. what is the record'saverage angular acceleration during this time interval? answer inunits of rad/s2
John and David are carrying Bob on a uniform horizontal board 8.9 m long which weighs 211 N. find the upward force exerted by both John and David
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