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A step-down transformer is used for recharging the batteries of portable devices. The turns ratio N2/N1 for a particular transformer used in a CD player is 7:57. When used with 120 V (rms) household service, the transformer draws an rms current of 350 mA. Find the following.
(a) rms output voltage of the transformer
_____V
(b) power delivered to the CD player
_____W
A dentist uses a small mirror of radius 55 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 20 mm from the tooth, what is the magnification of image.
Would you expect to get a more accurate value for m using Equation m = h'/h in the situation where the lens is closest to the object or in the situation where the lens is furthest from the object?
The wire in a 150 W aquarium heater has a diameter of 0.12 mm and is made of iron, What resistance should the wire have while the heater is operating
The magnitude of the electrostatic force between two identical ions that are separated by a distance of 0.90 nmis 4.103×10-8 N, How many electrons are missing from (or have been added to) each ion
A suction cup works by virtue of a vacuum that is created within the cup. When the cup is pressed against a flat surface, most of the air is forced out, what is the pressure inside the suction cup
Find the first and second derivative with respect to x of f(x) = (exp(x/a)-exp(-x/a))/2, where exp(x)=e^x is the exponential function.
An object of mass 45.0 g is initially placed in boiling water so that it is at 111° C. Then the object is dropped into a calorimeter, Find the specific heat of the object
A man drags a 75.0-kg crate across the floor at a constant velocity by pulling on a strap attached to the bottom of the crate. Find the magnitude of the tension in the strap
Consider a comet in a long, thin elliptical orbit with a semi-major axis of one AU. Illustrate what can you say about the sidereal period of this comet?
What fraction of the power radiated by the sun is intercepted by the planet Neptune? The radius of Mercury is 2.48 107 m
Calculate the rest energy of an electron in joules and Calculate the rest energy of an electron in MeV (1MeV=1.60×10?13J)
A 4kg pumpkin is sitting stationary on a platform. What is the total energy of the pumpkin measured by a person standing on the platform
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