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An illusionist causes a valuable piece of jewelry apparently to disappear by dropping it in a pool of water directly under the center of a circular platform floating on the surface. Find the minimum diameter of the platform that would prevent the jewelfrom being seen. Assume the water surface is calm, the index of refraction of water is 1.33, and the depth of the water is 2.00 m.
A light string is wrapped around a 0.160-kg hollow 0.080-m-radius hoop. The hoop is released from rest and the fee end of the string is held in place. What is tension in the string while the hoop falls
Two radio antennas are separated by 1.20m. Both broadcast identical 750 MHz waves. If you walk around the antennas in a circle of radius 20m, how many maxima will you detect.
You are given a container with 56 g of hydrogen atoms. What is the total charge on the electrons in the container
Converting sunlight to electricity with solar cells has an efficiency of 15%. It's possible to achieve a higher efficiency (though currently at higher cost) by using concentrated sunlight as the hot reservoir of a heat engine. What is the theoreti..
An extremely thin film of soapy water (n = 1.30) sits on top of a flat glass plate with n = 1.11. What is the thickness of the film
What is the tension T2 in the left-hand cable slanted at an angle of θ2 with respect to the wall? Illustrate what is the angle θ2 which the left-hand cable makes with respect to the ceiling?
A camera is supplied with two interchangeable lenses, whose focal lengths are 35.0 and 150.0 mm. What is the height (including sign) of her image on the film
A car owner forgets to turn off the headlights of his car while it is parked in his garage. how long will it take the battery to completely discharge
A wire 2.0mm in diameter and 4cmlong is connected to a 12V battery. If the resistivity of the wire is 3.5 x 10^-5 ohm-m; calculate the resistance of wire and its current
A charge of 810 C was passed through a wire in 5.70min. What was the average electric current during that interval
A particular vacuum flask has a mass of 1 kilogram and contains 1 liter of liquid water, how much energy did the heating element supply, You can disregard the energy needed to warm and vaporize the water
A spherical capacitor contains a charge of 3.30nC when connected to a potential difference of 250 V. Calculate the radius of the inner sphere
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